Patent ID: 11961964
Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 4:
5. The method of producing a lithium-ion secondary battery according to claim 1, wherein the zwitterionic compound is be represented by the following formula (I):, where X represents a phosphorus atom (P); R1 represents a C1-10 alkylene group, a C1-10 substituent containing an ether bond, or an aryl group; each of R2, R3, and R4 independently represents a hydrogen atom, a C1-10 alkyl group, a C1-10 substituent containing an ether bond, or an aryl group; and two or more of R1, R2, R3, and R4 may be bonded to each other and form a ring compound together with X.