Title:
FLAT, BONDED-ELECTRODE RECHARGEABLE ELECTROCHEMICAL CELL AND METHOD OF MAKING SAME
Document Type and Number:
WIPO Patent Application WO2001073863
Kind Code:
A3
Abstract:
A Li-ion battery cell comprising a polymeric matrix positive electrode layer member, a polymeric matrix negative electrode layer member, and an interposed microporous polyolefin separator layer member is laminated into a unitary, flexible cell structure by means of heat and pressure without necessity of aplied interlayer adhesive. A volatile vehicle solution of a primary plasticizer for the electrode member polymer matrix is applied to the microporous separator member where it is absorbed into the porous structure. Evaporation of the volatile vehicle solvent deposits the plasticizer upon and within the pores of the separator member. During the lamination operation the plasticizer is forced into contact with the electrode member polymer where it softens the polymer into a thermoplastic adhesive in the region of the electrode/separator interface, thereby enabling the electrode polymer alone to form a strong bond to the separator upon cooling.
Inventors:
GOZDZ ANTONI S
Application Number:
PCT/US2001/009004
Publication Date:
September 06, 2002
Filing Date:
March 21, 2001
Export Citation:
Assignee:
VALENCE TECHNOLOGY NEVADA INC (US)
International Classes:
B29C65/00; B29C65/48; B32B7/10; H01M4/13; H01M4/139; H01M4/62; H01M10/0525; H01M10/0565; H01M10/0585; H01M10/36; H01M10/38; H01M50/417; H01M50/489; H01M10/04; (IPC1-7): H01M10/40; H01M2/16
Foreign References:
| EP0933824A2 | 1999-08-04 | |||
| US5688293A | 1997-11-18 | |||
| EP0243653A2 | 1987-11-04 | |||
| US5961671A | 1999-10-05 |
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