Patent ID: 11961959
Assignee: PANASONIC HOLDINGS CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A lithium-ion battery comprising:
a negative electrode;
a positive electrode; and
a nonaqueous electrolyte consisting essentially of a lithium salt, a nonaqueous solvent and an additive mixture, wherein the nonaqueous solvent comprises methyl acetate, the lithium salt consists essentially of lithium hexafluorophosphate, and the additive mixture comprises:
a first operative additive of 1,3,2-dioxathiolane-2,2-dioxide or another sulfur-containing additive selected from the group consisting of: methylene methane disulfonate, trimethylene sulfate, 3-hydroxypropanesulfonic acid γ-sultone, and glycol sulfite, wherein a concentration of the first operative additive is at a concentration of at most about 2% by weight; and
a second operative additive of fluoroethylene carbonate, wherein a concentration of the second operative additive is at a concentration of at most about 2% by weight;

wherein the positive electrode comprises a grain size of greater than 0.5 micrometers;
wherein the battery has 95% retention of initial capacity after 200 cycles between 3.0 V and 4.3 V at a charging rate of C/3 CCCV at 40° C.