Nonaqueous secondary cell
View Patent ↗A nonaqueous secondary cell including the following elements: a positive electrode capable of absorbing and releasing lithium; a negative electrode capable of absorbing and releasing lithium; and a nonaqueous electrolyte including a nonaqueoous solvent and a lithium salt dissolved therein wherein the electrolyte contains a vinyl ethylene carbonate compound represented by the general formula (1) wherein R1, R2, R3, R4, R5, and R6 represent each independently a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms, and furthermore contains at least a compound selected from the group consisting of vinylene carbonate, a cyclic sulfonic acid ester or a cyclic sulfuric acid ester, and an acid anhydride.
1. A nonaqueous secondary cell comprising:
a positive electrode capable of absorbing and releasing lithium;
a negative electrode capable of absorbing and releasing lithium; and
an electrolyte comprising a nonaqueous solvent and a lithium salt dissolved therein,
wherein said electrolyte contains a vinyl ethylene carbonate compound represented by the general formula (1),
wherein R 1 , R 2 , R 3 , R 4 , R 5 and R 6 represent each independently a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms,
said electrolyte contains at least a compound selected from the group consisting of a cyclic sulfonic acid ester, a cyclic sulfuric acid ester, and a cyclic acid anhydride, and
said electrolyte contains the cyclic sulfonic acid ester, wherein said cyclic sulfonic acid ester comprises 1,3-propene sultone.
2. The nonaqueous secondary cell according to claim 1 , wherein said nonaqueous solvent contains γ-butyrolactone.
3. The nonaqueous secondary cell according to claim 2 , wherein said lithium salt includes LiBF 4 and LiPF 6 .
4. The nonaqueous secondary cell according to claim 1 , wherein the total content of said vinyl ethylene carbonate compound, said cyclic sulfonic acid ester, said cyclic sulfuric acid ester, and said cyclic acid anhydride is 0.05 wt % or above and 5 wt % or below relative to the total weight of said electrolyte.
5. The nonaqueous secondary cell according to claim 4 , wherein said nonaqueous solvent contains γ-butyrolactone.
6. The nonaqueous secondary cell according to claim 1 , wherein said electrolyte contains the cyclic sulfuric acid ester, and wherein said cyclic sulfuric acid ester comprises glycol sulfate.
7. The nonaqueous secondary cell according to claim 6 , wherein said nonaqueous solvent contains γ-butyrolactone.
8. The nonaqueous secondary cell according to claim 1 , wherein said electrolyte contains the cyclic acid anhydride, wherein said cyclic acid anhydride is at least one selected from the group consisting of a succinic anhydride, a glutaric anhydride, a maleic anhydride, a citraconic anhydride, a diglycolic anhydride, a cyclohexanedicarboxylic anhydride, a 4-cyclohexene-1,2-dicarboxylic anhydride, a 3,4,5,6-tetrahydrophthalic anhydride, a 5-norbornene-2,3-dicarboxylic anhydride, a phenylsuccinic anhydride, and a 2-phenylglutaric anhydride.