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US 7,745,058 B2Granted
Non-aqueous solvent, non-aqueous electrolyte compositions, and non-aqueous electrolyte secondary battery
AssigneeSony Corporation
InventorYukifumi Takeda
Life of this patent
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Abstract
A non-aqueous solvent is provided that includes ethylene carbonate in a range from 5% or more to less than 60%, propylene carbonate of 40% or less, and diethyl carbonate of 40% or more, as mass ratios. The non-aqueous electrolyte compositions are formed by further adding an electrolytic salt and, if necessary, unsaturated cyclic carbonic ester and a high molecular compound into the non-aqueous solvent. A non-aqueous electrolyte secondary battery is formed by using the non-aqueous electrolyte compositions.
Claims4
A non-aqueous electrolyte composition comprising:
- an electrolytic salt;
- a non-aqueous solvent containing ethylene carbonate having a mass ratio ranging from 5% or more to less than 60%, propylene carbonate having a mass ratio of greater than 0% and less than 40%, and diethyl carbonate having a mass ratio of 40% to 70% as a mass ratio, respectively;
- an unsaturated cyclic carbonic ester, wherein the unsaturated cyclic carbonic ester is vinylethylene carbonate;
- and
- a high molecular compound wherein said high molecular compound is at least one kind selected from the group consisting of polyvinyl formal, polyacrylic acid ester, and polyvinylidene fluoride,
- wherein the vinylethylene carbonate included in the non-aqueous solvent is in an amount ranging from 0.1 to 2% as a mass ratio, and
- wherein the mass ratio of the ethylene carbonate, the propylene carbonate, the diethyl carbonate, and vinylethylene carbonate total 100% of the mass of the non-aqueous solvent.
4 more elements
A non-aqueous electrolyte secondary battery comprising:
- a cathode containing cathode active material and an anode containing anode active material, each active material capable of doping and dedoping lithium ions;
- a non-aqueous electrolyte composition;
- a separator;
- and
- a sheathing member enclosing the cathode, the anode, the non-aqueous electrolyte compositions, and the separator,
- wherein the non-aqueous electrolyte composition includes:
- an electrolytic salt;
- a non-aqueous solvent including ethylene carbonate having a mass ratio ranging from 5% or more to less than 60%, propylene carbonate having a mass ratio of greater than 0% and less than 40%, and diethyl carbonate having a mass ratio of 40% to 70%;
- an unsaturated cyclic carbonic ester wherein the unsaturated cyclic carbonic ester is vinylethylene carbonate, and wherein the unsaturated cyclic carbonic ester is included in the non-aqueous solvent in an amount ranging from 0.1 to 2% as a mass ratio;
- and
- a high molecular compound wherein said high molecular compound is at least one kind selected from the group consisting of polyvinyl formal, polyacrylic acid ester, and polyvinylidene fluoride,
- wherein the mass ratio of the ethylene carbonate, the propylene carbonate, the diethyl carbonate, and vinylethylene carbonate total 100% of the mass of the non-aqueous solvent.
9 more elements
Dependencies are inferred from the claim text.