发明名称 |
SILICON OXIDE PARTICLES, MAKING METHOD, LITHIUM ION SECONDARY BATTERY, AND ELECTROCHEMICAL CAPACITOR |
摘要 |
Silicon oxide particles each comprising an inner portion having an iron content of 10-1,000 ppm and an outer portion having an iron content of up to 30 ppm are suitable as negative electrode active material in nonaqueous electrolyte secondary batteries. Using a negative electrode comprising the silicon oxide particles as active material, a lithium ion secondary battery or electrochemical capacitor having a high capacity and improved cycle performance can be constructed. |
申请公布号 |
US2016149214(A1) |
申请公布日期 |
2016.05.26 |
申请号 |
US201615009238 |
申请日期 |
2016.01.28 |
申请人 |
Shin-Etsu Chemical Co., Ltd. |
发明人 |
FUKUOKA Hirofumi;UENO Susumu;WATANABE Koichiro |
分类号 |
H01M4/48;H01M4/38;H01M10/0525 |
主分类号 |
H01M4/48 |
代理机构 |
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代理人 |
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主权项 |
1. A lithium ion secondary battery comprising a positive electrode, a negative electrode, and a lithium ion-conducting nonaqueous electrolyte, said negative electrode comprising a silicon oxide particles as negative electrode active material having an average particle size of 0.1 to 30 μm and a BET specific surface area of 0.5 to 30 m2/g, wherein a first iron content of inner portion of the silicon oxide particles is 15 to 1,000 ppm, and a second iron content of outer portion of the silicon oxide particles is 4 to 10 ppm, and
wherein the inner portion is different from the outer portion. |
地址 |
Tokyo JP |