Film forming method for lithium ion rechargeable batteries
US5720780A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 4, 1996 |
| Grant date | Feb 24, 1998 |
| Priority date | — |
| Expiry date | Nov 4, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49108
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A novel processing method provides a separator or electrode film demonstrating good physical properties and excellent conductive properties. Specifically, a binder of a suitable polymer, such as a polyvinylidene difluoride (PVdF) homopolymer, and a filler material such as silica or alumina are homogenized, such as by ball milling, to form a mixture free of solvents or plasticizers. An appropriate plasticizer, such as dimethyl adipate, is mixed into the binder and filler materials, and the resulting material is formed into a sheet. The sheet is hot pressed or melt processed at a temperature greater than the softening point but less than the melting point of the polymer mix. Electrode films can also be made using the method herein.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.