公开(公告)号：US20110281165A1

公开(公告)日：2011-11-17

申请号：US13191148

申请日：2011-07-26

Applicant: Atsushi UEDA ,  Shoichiro WATANABE ,  Takeshi YAO ,  Takashi TAKEUCHI ,  Takayuki SHIRANE ,  Takaya SAITO ,  Hiromi NAGATA

Inventor： Atsushi UEDA ,  Shoichiro WATANABE ,  Takeshi YAO ,  Takashi TAKEUCHI ,  Takayuki SHIRANE ,  Takaya SAITO ,  Hiromi NAGATA

IPC: H01M4/131 ,  H01M4/52 ,  H01M4/50 ,  H01M10/052 ,  H01M4/134

CPC classification number: H01M10/0566 ,  H01M4/131 ,  H01M4/133 ,  H01M4/485 ,  H01M4/505 ,  H01M4/525 ,  H01M4/587 ,  H01M10/0525 ,  H01M10/44 ,  H01M10/448 ,  H01M2010/4292

Abstract: A non-aqueous electrolyte secondary battery includes a positive electrode that contains a lithium composite oxide as an active material. The cut-off voltage of charge is set to 4.25 to 4.5 V. In a region where the positive electrode and the negative electrode face each other, the Wp/Wn ratio R is in the range from 1.3 to 19 where Wp is the weight of the active material contained in the positive electrode per unit area and Wn is the weight of the active material contained in the negative electrode per unit area. This battery is excellent in safety, cycle characteristics, and storage characteristics even when the cut-off voltage of charge in a normal operating condition is set to 4.25 V or more.

Abstract translation: 非水电解质二次电池包括含有作为活性物质的锂复合氧化物的正极。 电荷截止电压设定为4.25〜4.5V。在正极和负极彼此面对的区域中，Wp / Wn比R在1.3〜19的范围内，Wp为 包含在每单位面积的正极中的活性物质，Wn是单位面积中负极中含有的活性物质的重量。 即使正常工作状态下的充电截止电压设定为4.25V以上，该电池的安全性，循环特性，存储特性也优异。