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公开(公告)号:US20180076479A1
公开(公告)日:2018-03-15
申请号:US15560373
申请日:2016-03-22
Applicant: NEC CORPORATION
Inventor: Daisuke KAWASAKI , Kenichi SHlMURA , Noboru YOSHIDA , Kazuhiko INOUE , Jiro IRIYAMA
CPC classification number: H01M10/0525 , H01M2/145 , H01M2/1626 , H01M2/1633 , H01M2/1653 , H01M4/02 , H01M4/131 , H01M4/364 , H01M4/38 , H01M4/525 , H01M10/04 , H01M10/0567 , H01M10/058 , Y02T10/7011
Abstract: The present invention relates to a lithium ion secondary battery comprising an electrode element comprising a positive electrode, a negative electrode and a separator, and an electrolyte solution, wherein the separator has a shrinking ratio of 2% or less by heat treatment at 90 ° C. for 6 hours, and a contest of physically adsorbed water of the electrode element is 2% by mass or less, or a content of chemically adsorbed water in a positive electrode active material layer of the positive electrode is 1% by mass or less.