Title:
POSITIVE ELECTRODE FOR SECONDARY BATTERIES, SECONDARY BATTERY, AND ELECTRONIC EQUIPMENT
Document Type and Number:
WIPO Patent Application WO/2021/070002
Kind Code:
A1
Abstract:
Provided is a positive electrode that is for secondary batteries and that has excellent cycle characteristics. This positive electrode for secondary batteries has a positive electrode collector layer, an underlying film, a positive electrode active material layer, and a cap layer, wherein the underlying film includes titanium nitride, the positive electrode active material layer includes lithium cobalt oxide, and the cap layer includes titanium oxide. The application of titanium nitride to the underlying film ensures sufficient conductivity, and inhibits oxidation of the positive electrode collector layer and diffusion of metal atoms. In addition, by applying titanium oxide to the cap layer, it is possible to improve cycle characteristics through inhibition of collapse of the crystal structure of the electrode active material and side reactions between the positive electrode active material layer and electrolytes.
Inventors:
OGITA KAORI (JP)
KADOMA HIROSHI (JP)
HIROSE TOMOYA
YONEDA YUMIKO (JP)
IWAKI YUJI (JP)
TAKAHASHI TATSUYOSHI (JP)
YAMAZAKI SHUNPEI (JP)
MIKAMI MAYUMI (JP)
TANEMURA KAZUKI (JP)
KADOMA HIROSHI (JP)
HIROSE TOMOYA
YONEDA YUMIKO (JP)
IWAKI YUJI (JP)
TAKAHASHI TATSUYOSHI (JP)
YAMAZAKI SHUNPEI (JP)
MIKAMI MAYUMI (JP)
TANEMURA KAZUKI (JP)
Application Number:
PCT/IB2020/059076
Publication Date:
April 15, 2021
Filing Date:
September 29, 2020
Export Citation:
Assignee:
SEMICONDUCTOR ENERGY LAB (JP)
International Classes:
H01M4/131; H01M4/525; H01M10/052; H01M10/0562; H01M10/0566
Domestic Patent References:
| WO2011122671A1 | 2011-10-06 |
Foreign References:
| JP2017208325A | 2017-11-24 | |||
| JP2011198550A | 2011-10-06 | |||
| JP2015213079A | 2015-11-26 | |||
| US20190097227A1 | 2019-03-28 | |||
| CN109473656A | 2019-03-15 |
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