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

IPC: H01M10/0525 ,  H01M4/38 ,  H01M4/36 ,  H01M4/02 ,  H01M2/14 ,  H01M2/16

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.