公开(公告)号：JPS63289765A

公开(公告)日：1988-11-28

申请号：JP12492187

申请日：1987-05-21

Applicant: BRIDGESTONE CORP

Inventor： TOYOSAWA SHINICHI ,  KISHIMA SHIGERU ,  ARAI KATSUHIKO ,  MAEDA HIROKO ,  KAWAGOE TAKAHIRO

IPC: C08G73/02 ,  H01M4/60 ,  H01M4/66 ,  H01M4/74 ,  H01M10/05 ,  H01M10/052 ,  H01M10/0568 ,  H01M10/0569

Abstract: PURPOSE:To improve local discharge and a cycle life by using poly aniline containing BF4 in a specified ratio for an active material of a positive electrode. CONSTITUTION:Poly aniline is used for an active material of a positive electrode. In this case the poly aniline contains BF4 of 15 to 30 wt.%. By using the poly aniline as described above for an active material of a positive electrode, local discharge is repressed and a long lived secondary battery is obtained. When the content of BF4 is less than 15 wt.% or more than 30 wt.%, discharge capacity and capacity retention are lowered, so that the purpose is not attained. As for an active material of a negative electrode a combination of Li-Al containing Li of 25 to 65 atomic % is preferable.

公开(公告)号：JPS63289766A

公开(公告)日：1988-11-28

申请号：JP12492287

申请日：1987-05-21

Applicant: BRIDGESTONE CORP

Inventor： TOYOSAWA SHINICHI ,  KISHIMA SHIGERU ,  ARAI KATSUHIKO ,  MAEDA HIROKO ,  KAWAGOE TAKAHIRO

IPC: C08G73/02 ,  H01M4/60 ,  H01M4/66 ,  H01M4/74 ,  H01M10/05 ,  H01M10/052 ,  H01M10/0568 ,  H01M10/0569

Abstract: PURPOSE:To improve local discharge and a cycle life by using poly aniline, of which equilibrium pH of extract is in a specified range, for an active material of a positive electrode. CONSTITUTION:Poly aniline is used for an active material of a positive electrode. The poly aniline in this case shall have the character that when 1 gram of the poly aniline is extracted by the water of 200 cc the equilibrium pH of the extracting water shall be 2.4 to 4. Thereby local discharge is suppressed and a secondary battery of a long cycle life is obtained. When the equilibrium pH of the extracting water is lower than 2.4 or higher than 4, discharge capacity and capacity retention are lowered. As for an active material for a negative electrode the use of Li-Al alloy containing Li of 25 to 65 atomic% is preferable.