Nonaqueous lithium-type power storage element

A method for producing a nonaqueous lithium-type power storage element, the method comprising:

• providing a nonaqueous lithium-type power storage element with a positive electrode, a negative electrode, a separator and a nonaqueous electrolytic solution containing lithium ions,
• aging step in which the nonaqueous lithium-type power storage element is maintained at a temperature of 40° C. or more to decompose the nonaqueous electrolytic solution,
• wherein the step of providing a nonaqueous lithium-type power storage element comprises:
• providing a positive electrode precursor having a positive electrode power collector and a positive electrode active material layer provided on one side or both sides of the positive electrode power collector, wherein the positive electrode active material layer contains a positive electrode active material, and a lithium compound other than the positive electrode active material,
• providing a negative electrode having a negative electrode power collector and a negative electrode active material layer provided on one side or both sides of the negative electrode power collector, wherein the negative electrode active material layer contains a negative electrode active material comprising a carbon material capable of intercalating and releasing lithium ions,
• laminating the positive electrode precursor and the negative electrode with a separator interposed therebetween to obtain an electrode laminated body, or winding the positive electrode precursor and the negative electrode with a separator interposed therebetween to obtain an electrode wound body,
• housing the electrode laminated body or electrode wound body in a casing, injecting a nonaqueous electrolytic solution into the casing, and sealing the casing, and
• pre-doping the negative electrode active material layer with the lithium ions by decomposing the lithium compound by applying a voltage between the positive electrode precursor and the negative electrode to decompose the lithium compound in the positive electrode precursor and release the lithium ions followed by reducing the lithium ions at the negative electrode,
• wherein the negative electrode in the nonaqueous lithium-type power storage element has a negative electrode power collector and a negative electrode active material layer containing a negative electrode active material provided on one side or both sides of the negative electrode power collector, and the negative electrode active material contains a carbon material capable of intercalating and releasing lithium ions,
• wherein the positive electrode in the nonaqueous lithium-type power storage element has a positive electrode power collector and a positive electrode active material layer containing a positive electrode active material provided on one side or both sides of the positive electrode power collector, and the positive electrode active material contains activated carbon,
• wherein the positive electrode active material layer in the nonaqueous lithium-type power storage element contains 1.60×10−4 mol/g to 300×10−4 mol/g of one or more types of compounds selected from compounds represented by the following formulas (1) to (3) per unit weight of the positive electrode active material layer:
• [Chem. 1]
• LiX1—OR1O—X2Li (1)
• (wherein, R1 represents an alkylene group having 1 to 4 carbon atoms or a halogenated alkylene group having 1 to 4 carbon atoms, and X1 and X2 respectively and independently represent —(COO)n (wherein, n represents 0 or 1)),
• [Chem. 2]
• LiX1—OR1O—X2R2 (2)
• (wherein, R1 represents an alkylene group having 1 to 4 carbon atoms or a halogenated alkylene group having 1 to 4 carbon atoms, R2 represents a group selected from the group consisting of a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, a mono- or polyhydroxyalkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, a mono- or polyhydroxyalkenyl group having 2 to 10 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms and an aryl group, and X1 and X2 respectively and independently represent —(COO)n (wherein, n represents 0 or 1)), and
• [Chem. 3]
• R2X1—OR1O—X2R3 (3)
• (wherein, R1 represents an alkylene group having 1 to 4 carbon atoms or a halogenated alkylene group having 1 to 4 carbon atoms, R2 and R3 respectively and independently represent a group selected from the group consisting of a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, a mono- or polyhydroxyalkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, a mono- or polyhydroxyalkenyl group having 2 to 10 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms and an aryl group, and X1 and X2 respectively and independently represent —(COO)n (wherein, n represents 0 or 1)), and
• wherein the positive electrode contains a lithium compound, the lithium compound is one or more types of compounds selected from lithium carbonate, lithium oxide, lithium hydroxide, lithium chloride, lithium bromide, lithium iodide, lithium nitride, lithium oxalate and lithium acetate, 0.1 μm≤X1≤10.0 μm when the average particle diameter of the lithium compound is defined as X1, 2.0 μm≤Y1≤20.0 μm when the average particle diameter of the positive electrode active material is defined as Y1, X1<Y1, and the amount of lithium compound contained in the positive electrode is 1% by weight to 50% by weight.

A method for producing a nonaqueous lithium-type power storage element, the method comprising:

• providing a nonaqueous lithium-type power storage element with a positive electrode, a negative electrode, a separator and a nonaqueous electrolytic solution containing lithium ions;
• aging step in which the nonaqueous lithium-type power storage element is maintained at a temperature of 40° C. or more to decompose the nonaqueous electrolytic solution,
• wherein the step of providing a nonaqueous lithium-type power storage element comprises:
• providing a positive electrode precursor having a positive electrode power collector and a positive electrode active material layer provided on one side or both sides of the positive electrode power collector, wherein the positive electrode active material layer contains a positive electrode active material, and a lithium compound other than the positive electrode active material,
• providing a negative electrode having a negative electrode power collector and a negative electrode active material layer provided on one side or both sides of the negative electrode power collector, wherein the negative electrode active material layer contains a negative electrode active material comprising a carbon material capable of intercalating and releasing lithium ions,
• laminating the positive electrode precursor and the negative electrode with a separator interposed therebetween to obtain an electrode laminated body, or winding the positive electrode precursor and the negative electrode with a separator interposed therebetween to obtain an electrode wound body,
• housing the electrode laminated body or electrode wound body in a casing, injecting a nonaqueous electrolytic solution into the casing, and sealing the casing, and
• pre-doping the negative electrode active material layer with the lithium ions by decomposing the lithium compound by applying a voltage between the positive electrode precursor and the negative electrode to decompose the lithium compound in the positive electrode precursor and release the lithium ions followed by reducing the lithium ions at the negative electrode,
• wherein the negative electrode in the nonaqueous lithium-type power storage element has a negative electrode power collector and a negative electrode active material layer containing a negative electrode active material provided on one side or both sides of the negative electrode power collector, and the negative electrode active material contains a carbon material capable of intercalating and releasing lithium ions,
• wherein the positive electrode in the nonaqueous lithium-type power storage element has a positive electrode power collector and a positive electrode active material layer containing a positive electrode active material provided on one side or both sides of the positive electrode power collector, and the positive electrode active material contains activated carbon,
• wherein the positive electrode active material layer in the nonaqueous lithium-type power storage element contains 1.60×10−4 mol/g to 300×10−4 mol/g of one or more types of compounds selected from compounds represented by the following formulas (1) to (3) per unit weight of the positive electrode active material layer:
• [Chem. 1]
• LiX1—OR1O—X2Li (1)
• (wherein, R1 represents an alkylene group having 1 to 4 carbon atoms or a halogenated alkylene group having 1 to 4 carbon atoms, and X1 and X2 respectively and independently represent —(COO)n (wherein, n represents 0 or 1)),
• [Chem. 2]
• LiX1—OR1O—X2R2 (2)
• (wherein, R1 represents an alkylene group having 1 to 4 carbon atoms or a halogenated alkylene group having 1 to 4 carbon atoms, R2 represents a group selected from the group consisting of a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, a mono- or polyhydroxyalkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, a mono- or polyhydroxyalkenyl group having 2 to 10 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms and an aryl group, and X1 and X2 respectively and independently represent —(COO)n (wherein, n represents 0 or 1)), and
• [Chem. 3]
• R2X1—OR1O—X2R3 (3)
• (wherein, R1 represents an alkylene group having 1 to 4 carbon atoms or a halogenated alkylene group having 1 to 4 carbon atoms, R2 and R3 respectively and independently represent a group selected from the group consisting of a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, a mono- or polyhydroxyalkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, a mono- or polyhydroxyalkenyl group having 2 to 10 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms and an aryl group, and X1 and X2 respectively and independently represent —(COO)n (wherein, n represents 0 or 1)), and
• wherein the positive electrode active material in the nonaqueous lithium-type power storage element contained in the positive electrode active material layer is activated carbon that satisfies the expressions 0.3<V1≤0.8 and 0.5≤V2≤1.0 when mesopore volume derived from pores having a diameter of 20 Å to 500 Å as calculated by the BJH method is defined as V1 (cc/g) and micropore volume derived from pores having a diameter of less than 20 Å as calculated according to the MP method is defined as V2 (cc/g), and demonstrates a specific surface area as measured by the BET method of 1,500 m2/g to 3,000 m2/g.

A method for producing a nonaqueous lithium-type power storage element, the method comprising:

• providing a nonaqueous lithium-type power storage element with a positive electrode, a negative electrode, a separator and a nonaqueous electrolytic solution containing lithium ions;
• aging step in which the nonaqueous lithium-type power storage element is maintained at a temperature of 40° C. or more to decompose the nonaqueous electrolytic solution,
• wherein the step of providing a nonaqueous lithium-type power storage element comprises:
• providing a positive electrode precursor having a positive electrode power collector and a positive electrode active material layer provided on one side or both sides of the positive electrode power collector, wherein the positive electrode active material layer contains a positive electrode active material, and a lithium compound other than the positive electrode active material,
• providing a negative electrode having a negative electrode power collector and a negative electrode active material layer provided on one side or both sides of the negative electrode power collector, wherein the negative electrode active material layer contains a negative electrode active material comprising a carbon material capable of intercalating and releasing lithium ions,
• laminating the positive electrode precursor and the negative electrode with a separator interposed therebetween to obtain an electrode laminated body, or winding the positive electrode precursor and the negative electrode with a separator interposed therebetween to obtain an electrode wound body,
• housing the electrode laminated body or electrode wound body in a casing, injecting a nonaqueous electrolytic solution into the casing, and sealing the casing, and
• pre-doping the negative electrode active material layer with the lithium ions by decomposing the lithium compound by applying a voltage between the positive electrode precursor and the negative electrode to decompose the lithium compound in the positive electrode precursor and release the lithium ions followed by reducing the lithium ions at the negative electrode,
• wherein the negative electrode in the nonaqueous lithium-type power storage element has a negative electrode power collector and a negative electrode active material layer containing a negative electrode active material provided on one side or both sides of the negative electrode power collector, and the negative electrode active material contains a carbon material capable of intercalating and releasing lithium ions,
• wherein the positive electrode in the nonaqueous lithium-type power storage element has a positive electrode power collector and a positive electrode active material layer containing a positive electrode active material provided on one side or both sides of the positive electrode power collector, and the positive electrode active material contains activated carbon,
• wherein the positive electrode active material layer in the nonaqueous lithium-type power storage element contains 1.60×10−4 mol/g to 300×10−4 mol/g of one or more types of compounds selected from compounds represented by the following formulas (1) to (3) per unit weight of the positive electrode active material layer:
• [Chem. 1]
• LiX1—OR1O—X2Li (1)
• (wherein, R1 represents an alkylene group having 1 to 4 carbon atoms or a halogenated alkylene group having 1 to 4 carbon atoms, and X1 and X2 respectively and independently represent —(COO)n (wherein, n represents 0 or 1)),
• [Chem. 2]
• LiX1—OR1O—X2R2 (2)
• (wherein, R1 represents an alkylene group having 1 to 4 carbon atoms or a halogenated alkylene group having 1 to 4 carbon atoms, R2 represents a group selected from the group consisting of a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, a mono- or polyhydroxyalkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, a mono- or polyhydroxyalkenyl group having 2 to 10 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms and an aryl group, and X1 and X2 respectively and independently represent —(COO)n (wherein, n represents 0 or 1)), and
• [Chem. 3]
• R2X1—OR1O—X2R3 (3)
• (wherein, R1 represents an alkylene group having 1 to 4 carbon atoms or a halogenated alkylene group having 1 to 4 carbon atoms, R2 and R3 respectively and independently represent a group selected from the group consisting of a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, a mono- or polyhydroxyalkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, a mono- or polyhydroxyalkenyl group having 2 to 10 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms and an aryl group, and X1 and X2 respectively and independently represent —(COO)n (wherein, n represents 0 or 1)), and
• wherein the positive electrode active material contained in the positive electrode active material layer in the nonaqueous lithium-type power storage element is activated carbon in which the mesopore volume V1 (cc/g) derived from pores having a diameter of 20 Å to 500 Å as calculated by the BJH method satisfies the expression 0.8<V1≤2.5 and the micropore volume V2 (cc/g) derived from pores having a diameter of less than 20 Å as calculated according to the MP method satisfies the expression 0.8<V2≤3.0, and demonstrates a specific surface area as measured by the BET method of 2,300 m2/g to 4,000 m2/g.

A method for producing a nonaqueous lithium-type power storage element, the method comprising:

• providing a nonaqueous lithium-type power storage element with a positive electrode, a negative electrode, a separator and a nonaqueous electrolytic solution containing lithium ions;
• aging step in which the nonaqueous lithium-type power storage element is maintained at a temperature of 40° C. or more to decompose the nonaqueous electrolytic solution,
• wherein the step of providing a nonaqueous lithium-type power storage element comprises:
• providing a positive electrode precursor having a positive electrode power collector and a positive electrode active material layer provided on one side or both sides of the positive electrode power collector, wherein the positive electrode active material layer contains a positive electrode active material, and a lithium compound other than the positive electrode active material,
• providing a negative electrode having a negative electrode power collector and a negative electrode active material layer provided on one side or both sides of the negative electrode power collector, wherein the negative electrode active material layer contains a negative electrode active material comprising a carbon material capable of intercalating and releasing lithium ions,
• laminating the positive electrode precursor and the negative electrode with a separator interposed therebetween to obtain an electrode laminated body, or winding the positive electrode precursor and the negative electrode with a separator interposed therebetween to obtain an electrode wound body,
• housing the electrode laminated body or electrode wound body in a casing, injecting a nonaqueous electrolytic solution into the casing, and sealing the casing, and
• pre-doping the negative electrode active material layer with the lithium ions by decomposing the lithium compound by applying a voltage between the positive electrode precursor and the negative electrode to decompose the lithium compound in the positive electrode precursor and release the lithium ions followed by reducing the lithium ions at the negative electrode,
• wherein the negative electrode in the nonaqueous lithium-type power storage element has a negative electrode power collector and a negative electrode active material layer containing a negative electrode active material provided on one side or both sides of the negative electrode power collector, and the negative electrode active material contains a carbon material capable of intercalating and releasing lithium ions,
• wherein the positive electrode in the nonaqueous lithium-type power storage element has a positive electrode power collector and a positive electrode active material layer containing a positive electrode active material provided on one side or both sides of the positive electrode power collector, and the positive electrode active material contains activated carbon,
• wherein the positive electrode active material layer in the nonaqueous lithium-type power storage element contains 1.60×10−4 mol/g to 300×10−4 mol/g of one or more types of compounds selected from compounds represented by the following formulas (1) to (3) per unit weight of the positive electrode active material layer:
• [Chem. 1]
• LiX1—OR1O—X2Li (1)
• (wherein, R1 represents an alkylene group having 1 to 4 carbon atoms or a halogenated alkylene group having 1 to 4 carbon atoms, and X1 and X2 respectively and independently represent —(COO)n (wherein, n represents 0 or 1)),
• [Chem. 2]
• LiX1—OR1O—X2R2 (2)
• (wherein, R1 represents an alkylene group having 1 to 4 carbon atoms or a halogenated alkylene group having 1 to 4 carbon atoms, R2 represents a group selected from the group consisting of a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, a mono- or polyhydroxyalkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, a mono- or polyhydroxyalkenyl group having 2 to 10 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms and an aryl group, and X1 and X2 respectively and independently represent —(COO)n (wherein, n represents 0 or 1)), and
• [Chem. 3]
• R2X1—OR1O—X2R3 (3)
• (wherein, R1 represents an alkylene group having 1 to 4 carbon atoms or a halogenated alkylene group having 1 to 4 carbon atoms, R2 and R3 respectively and independently represent a group selected from the group consisting of a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, a mono- or polyhydroxyalkyl group having 1 to 10 carbon atoms, an alkenyl group having 2 to 10 carbon atoms, a mono- or polyhydroxyalkenyl group having 2 to 10 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms and an aryl group, and X1 and X2 respectively and independently represent —(COO)n (wherein, n represents 0 or 1)),
• wherein 0.20≤A/B≤20.0 when the content of the compound selected from compounds represented by the formulas (1) to (3) per unit weight of the positive electrode active material layer is defined as A and the content of the compound per unit weight of the negative electrode active material layer is defined as B,
• wherein the positive electrode contains at least one lithium compound other than the active material, and the active material is coated onto both sides of a nonporous positive electrode power collector of the positive electrode,
• wherein a negative electrode active material capable of intercalating and releasing lithium ions is coated onto both sides of a nonporous negative electrode power collector of the negative electrode,
• wherein Cx1/Cy1 is 1.02 to 1.35 when the basis weight of the positive electrode active material layer on one side (C side) of the positive electrode is defined as Cx1 (g/m2) and the basis weight of the positive electrode active material layer on the other side (Cy side) is defined as Cy1 (g/m2), and
• wherein Ax1/Ay1 is 1.02 to 1.35 when the basis weight of the negative electrode active material layer on one side of the electrode opposing the Cy side (Ay side) is defined as Ay1 (g/m2) and the basis weight of the negative electrode active material layer on the other side (Ax side) is defined as Ax1 (g/m2).