Lithium-ion secondary battery
View Patent ↗The negative electrode is formed from silicon, an amount of heat generation in a negative electrode, which is measured by a differential scanning calorimeter within a range of 210 to 380° C. during full charge, is 850 J/g or less, and a cyclic carbonate including ethylene carbonate and a chain carbonate which has a chemical formula expressed by R 1 —O—CO—OR 2 , and in which R 1 and R 2 represent an alkyl group having a carbon number of 2 or more are used for an electrolytic solution.
1. A lithium-ion secondary battery comprising:
a positive electrode;
a negative electrode; and
an electrolytic solution,
wherein the negative electrode contains silicon, and an amount of heat generation, which is measured by a differential scanning calorimeter within a range of 210 to 380° C. during full charge, is 850 J/g or less,
the electrolytic solution contains a chain carbonate and a cyclic carbonate,
the chain carbonate is a compound which has a chemical formula expressed by R 1 —O—CO—OR 2 , and in which R 1 and R 2 represent an alkyl group having a carbon number of 2 or more, and
the cyclic carbonate includes ethylene carbonate.
2. The lithium-ion secondary battery according to claim 1 ,
wherein the chain carbonate is diethyl carbonate.
3. The lithium-ion secondary battery according to claim 1 ,
wherein the negative electrode is heat-treated under an inert atmosphere.
4. The lithium-ion secondary battery according to claim 2 ,
wherein the negative electrode is heat-treated under an inert atmosphere.