Method for making solid polymer electrolyte and uses thereof
US6858670B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 26, 2002 |
| Grant date | Feb 22, 2005 |
| Priority date | — |
| Expiry date | Mar 10, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P70/50
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for preparing a composite alkaline solid polymer electrolyte from polyvinyl alcohol (PVA) polymer, potassium hydroxide and water. The polymer electrolyte is reinforced with glass-fiber cloth to increase a mechanical strength, thermal stability and electrochemical stability. A glass fiber cloth matrix provides a stable interface between a cathode and an anode to reduce a short circuit problem when the battery discharges at high rate. The processes for polymer electrolyte are controlled by molecular weight of PVA polymer, the sequence of feeding in reactants, the weight proportions of reactants, the reaction time, the reaction temperature, and the drying conditions, i.e., under the specified conditions of relative humidity (RH), temperature and drying time. The resulting electrolyte exhibits ionic conductivity of 0.15 S/cm or better at room temperature and has high mechanical intensity and good electrochemical stability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.