Wound battery and method for making it
US6280873A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 8, 1999 |
| Grant date | Aug 28, 2001 |
| Priority date | — |
| Expiry date | Apr 8, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P70/50
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A lithium battery made with a bipolar polyimide membrane with metal layers on each side, including one embodiment where the polyimide has a gold layer on each side. Different formulations for the positive electrode active material are used. The positive electrode active materials are essentially three substances: first, a lithium compound selected from the group consisting of LiCoO.sub.2, LiNiO.sub.2, and LiMn.sub.2 O.sub.4 ; second, a powder selected from the group consisting of AB (acetylene black powder) and graphite; and third, PVDF (polyvinyldifluoride). The negative electrode active material consists essentially of two substances: the first is graphite powder; the second is PVDF (polyvinyldifluoride). The positive electrode metals include gold and aluminum. The negative electrode materials include gold, copper, nickel, titanium and iron. A separator layer of polyethylene is used so the battery layers can be wound. Because of the strength of the polyimide, the battery can be tightly wound. The energy density of the battery is about 300 Watt-hours per cubic centimeter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.