ELECTROCHEMICAL ELEMENT NEGATIVE ELECTRODE, AND LITHIUM ION SECONDARY CELL

WIPO Patent Application WO/2019/171942

A1

Provided are: a lithium ion secondary cell with which it is possible to suppress the occurrence of swelling accompanying charging and discharging, and which has exceptional charge/discharge cycle characteristics; and an electrochemical element negative electrode with which it is possible to constitute part of the lithium ion secondary cell. This electrochemical element negative electrode is characterized by having a negative electrode mixture layer on at least one surface of a collector composed of a metal foil, the negative electrode mixture layer containing as a negative-electrode active material a material S that includes Si, and a refractory graphitic carbon material, such that the proportion of the material S is 50-90% by mass, and the proportion of the refractory graphitic carbon material is 10-50% by mass, where the total amount of the negative-electrode active material contained in the negative electrode mixture layer is defined as 100% by mass. This lithium ion secondary cell is characterized by having a positive electrode, a negative electrode, a separator, and a non-aqueous electrolyte, this electrochemical element negative electrode being configured as the negative electrode.

AOKI HIROYOSHI (JP)
ABE HIROSHI (JP)
ISHIZAWA SEIJI (JP)
KAMIZORI HARUKI (JP)

PCT/JP2019/006200

September 12, 2019

February 20, 2019

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MAXELL HOLDINGS LTD (JP)

H01M4/13; H01M4/133; H01M4/36; H01M4/48; H01M4/587; H01M10/052; H01M10/0566

WO2017077986A1

2017-05-11

JP2018006284A	2018-01-11
JP2017199510A	2017-11-02
JP2016100054A	2016-05-30
JPH1167276A	1999-03-09

MIWA, Tetsuo et al. (JP)

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