发明名称 |
LITHIUM SECONDARY BATTERY |
摘要 |
A lithium secondary battery according to the present invention includes: a positive electrode having a positive-electrode active material capable of occluding and releasing lithium ions; a negative electrode having a negative-electrode active material capable of occluding and releasing lithium ions; a separator interposed between the positive electrode and the negative electrode; and an electrolyte having lithium-ion conductivity. The positive-electrode active material contains a nickel-type lithium-containing complex oxide. The negative-electrode active material contains a graphite-type material having a reversible capacity of 350 mAh/g or more and an irreversible capacity of 30 mAh/g or less. A ratio Qc/Qa between an irreversible capacity Qc per unit area in a portion of the positive electrode that opposes the negative electrode and an irreversible capacity Qa per unit area in a portion of the negative electrode that opposes the positive electrode is equal to or greater than 0.50 but less than 1.13. As a result, the charge-discharge cycle characteristics can be improved while ensuring a high capacity.
|
申请公布号 |
US2012208087(A1) |
申请公布日期 |
2012.08.16 |
申请号 |
US201113502996 |
申请日期 |
2011.05.12 |
申请人 |
YAMAMOTO TAISUKE;TAKEZAWA HIDEHARU |
发明人 |
YAMAMOTO TAISUKE;TAKEZAWA HIDEHARU |
分类号 |
H01M4/525 |
主分类号 |
H01M4/525 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|