公开(公告)号：JPH1125994A

公开(公告)日：1999-01-29

申请号：JP11204198

申请日：1998-04-22

Applicant: IBM

Inventor： JOHN M COTTE ,  DATTA MADHAV ,  LAVINDLA SHENOI

IPC: H01M2/02 ,  H01M4/06 ,  H01M6/18 ,  H01M6/22

Abstract: PROBLEM TO BE SOLVED: To provide a solid polymer electrolyte battery by containing lithium salt and organic non-proton solvent in electrolyte and preparing organic non- proton solvent solution by specified amounts of ethylene carbonate, propylene carbonate and gamma butyloractone. SOLUTION: A polymer spacer 20 joins and seals the exposed peripheral edge of a polymer sheet 22, and forms a cavity for completely surrounding and enveloping a lithium foil negative electrode 14, an electrolyte film 16 and a positive electrode 18. For the electrolyte film 16, polyacrylonitrile is used, and electrolyte made of lithium salt solution and non-proton organic solvent is dispersed in the matrix of a polymer binder. For forming the positive electrode 18, a carbon such as manganese dioxide, activated charcoal, or carbon black is introduced to the solution of an electrolyte film material using polyacrylonitrile as a base. The positive electrode contains about 50 to 70 wt.% of manganese dioxide and about 2 wt.% of carbon in a capsule sealing matrix.

公开(公告)号：JPH10125336A

公开(公告)日：1998-05-15

申请号：JP26380097

申请日：1997-09-29

Applicant: IBM

Inventor： JOHN M COTTE ,  MADHAV DATTA ,  LAVINDLA SHENOI

IPC: H01M4/06 ,  H01M4/50 ,  H01M4/62 ,  H01M4/66 ,  H01M6/12 ,  H01M6/16 ,  H01M6/18 ,  H01M6/22 ,  H01M6/50

Abstract: PROBLEM TO BE SOLVED: To provide a primary lithium battery, which is particularly suited for use in a built-in self-powered portable device(SSPD) for a mobile communications and arithmetic unit, such as a radio-frequency identification tag, a PCMCIA card, or a smart card. SOLUTION: A battery 10 has a flexible and compact structure and preferably uses a solid-polymer electrolyte film 16, having a polyacrylonitrile matrix. The performance of the electrolyte film is optimized by controlling the amount of an aprotic organic solvent in the electrode film within the range of specified proportions. Thus, the performance characteristic of the battery almost approximates that of a conventional electrolyte but without safety problems related to the danger of electrolyte leakage, and shows increased performance at low ambient temperatures. The negative electrode of the battery is encapsulated in a polymer matrix and this excludes the danger of exposure caused by an in-lithium compound used in the negative electrode.