Lithium ion secondary battery
AssigneeFuji Photo Film Co., Ltd.
InventorTsutomu Miyasaka
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Abstract
In a lithium ion secondary battery having a positive electrode, a negative electrode, non-aqueous electrolyte, and a container sealing the electrodes anrd electrolyte therein, the positive electrode is formed of a positive electrode active material which is produced by electrochemically intercalating lithium ions into lithium manganese oxide in the container to give a positive electrode active material precursor comprising lithium manganese oxide of which lithium ion contents are increased, and then releasing lithium ions from the positive electrode active material precursor in the container, and the negative electrode is formed of a negative electrode active material which is produced by intercalating the released lithium ions into a negative electrode active material precursor of a metal oxide in the container.
Claims17
A lithium ion secondary battery comprising a positive electrode, a negative electrode non-aqueous electrolyte and a container sealing the electrodes and electrolyte therein, wherein
- the positive electrode comprises a positive electrode active material which has a cubic crystal structure, is represented bv the formula of Li.sub.y Mn.sub.2 O.sub.4 wherein 0<y<0.3 and is produced by electrochemically intercalating lithium ions into lithium manganese oxide in the container to give a positive electrode active material precursor which has a tetragonal crystal structure and is represented by the formula of Li.sub.1+x Mn.sub.2 O.sub.4 wherein 0.3<x<1 and then releasing lithium ions from the positive electrode active material precursor in the container;
- and
- the negative electrode comprises a negative electrode active material which is produced by intercalating the released lithium ions into a negative electrode active material precursor comprising a metal oxide in the container.
A lithium ion secondary battery precursor comprising a positive electrode precursor, a negative electrode precursor, non-aqueous electrolyte, and a container sealing the electrode precursors and electrolyte therein, wherein
- the positive electrode precursor comprises a positive electrode active material precursor which has a tetragonal crystal structure and is represented by the formula of Li.sub.1+x Mn.sub.2 O.sub.4 wherein 0.3<x<1 and is produced by electrochemically intercalating lithium ions into lithium manganese oxide in the container to increase the lithium ion content of the lithium manganese oxide;
- and
- the negative electrode precursor comprises a negative electrode active material precursor comprising a metal oxide.
A lithium ion secondary battery precursor comprising a positive electrode precursor, a negative electrode precursor, non-aqueous electrolyte, and a container sealing the electrode precursors and electrolyte therein, wherein
- the positive electrode precursor comprises lithium manganese oxide which has a spinel crystal structure, is represented by the formula of Li.sub.1+x (Mn.sub.2-y)O.sub.4 wherein 0.ltoreq.x<1.7 and 0.ltoreq.y<0.7, or the formula of Li.sub.1-x (Mn.sub.2-y)O.sub.4 wherein 0.ltoreq.x.ltoreq.1.0 and 0.ltoreq.y<0.5, and has a lithium metal or a lithium alloy in the vicinity of the lithium manganese oxide under the condition that the lithium metal or lithium alloy is in electric contact with the lithium manganese oxide;
- and the negative electrode precursor comprises a negative electrode active material precursor comprising a metal oxide.
A lithium ion secondary battery precursor comprising a positive electrode precursor, a negative electrode precursor, non-aqueous electrolyte, and a container sealing the electrode precursors and electrolyte therein, wherein
- the positive electrode precursor comprises lithium manganese oxide;
- and
- the negative electrode precursor comprises a negative electrode active material comprising an amorphous metal oxide which has a tin atom and at least one other metal atom and which is represented by the formula of SnL.sub.k O.sub.z in which L is at least one atom selected from the group consisting of Al, B, P, Si, Li, Na, K, Rb, Cs, Be, Mg, Ca, Sr, Ba, Sc, Y, lanthanides, and halogens, and k and z are numbers satisfying the conditions of 0.2.ltoreq.k.ltoreq.2 and 1.ltoreq.z.ltoreq.6, respectively, or the formula of Sn.sub.d Q.sub.1-d L.sub.k O.sub.z in which Q is a transition metal atom, L is at least one atom selected from the group consisting of Al, B, P, Si, Li, Na, K, Rb, Cs, Be, Mg, Ca, Sr, Ba, Sc, Y, lanthanides, and halogens, and d, k and z are numbers satisfying the conditions of 0.1.ltoreq.d.ltoreq.0.9. 0.2.ltoreq.k.ltoreq.2 and 1.ltoreq.z.ltoreq.6, respectively, and has a lithium metal or a lithium alloy in the vicinity of the negative electrode active material precursor under the condition that the lithium metal or lithium alloy is brought into electric contact with the lithium manganese oxide through an externally set electric circuit.
Dependencies are inferred from the claim text.