公开(公告)号：US20200343581A1

公开(公告)日：2020-10-29

申请号：US16959641

申请日：2019-01-09

Applicant: MAZDA MOTOR CORPORATION

Inventor： Hiroki FUJITA ,  Hiroyuki SAKAI ,  Wataru MASUDA

IPC: H01M10/0525 ,  H01M10/0569 ,  H01M10/0563 ,  H01M10/0568 ,  H01M4/587

Abstract: An electrolyte to be used in a lithium ion secondary battery that contains a graphite-based carbon material as a negative electrode active material is obtained by dissolving a lithium salt in a nonaqueous solvent. The nonaqueous solvent contains a cyclic carbonate and a cyclic ester. The proportion of the sum of the cyclic carbonate and the cyclic ester in the total amount of the nonaqueous solvent is 85 vol % or more. The proportion of the cyclic carbonate in the sum of the cyclic carbonate and the cyclic ester is 60 vol % or more to 95 vol % or less.

公开(公告)号：US20220223927A1

公开(公告)日：2022-07-14

申请号：US17595237

申请日：2020-05-14

Applicant: Mazda Motor Corporation

Inventor： Wataru MASUDA ,  Teruhiko HANAOKA ,  Toshiki TAKAHASHI ,  Susumu MINEOI ,  Hiroyuki SAKAI ,  Hiroki FUJITA

IPC: H01M10/42 ,  H01M10/0525 ,  H01M10/0569 ,  H01M4/587 ,  H01M4/36 ,  H01M4/62

Abstract: An object of the present invention is to solve the problem of a decomposed product of cyclic ester that causes cycle deterioration and storage deterioration of a lithium ion secondary battery. As a solution for the problem, the lithium ion secondary battery includes; a positive electrode; a negative electrode using a graphite-based carbon material as a negative electrode active material; an electrolyte in which lithium salt is dissolved in a nonaqueous solvent containing cyclic ester; and either a barrier layer 15 configured to inhibit contact of the cyclic ester with the negative electrode or a capturing material configured to trap a decomposed product of the cyclic ester generated at the negative electrode.