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US 2009/0023076 A1Published application
Polymer electrolyte and battery using same
AssigneeSony Corporation
InventorsYukifumi Takeda, Yoshiaki Naruse
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AssigneeSony Corporation
InventorsYukifumi Takeda, Yoshiaki Naruse
Estimating the term…
A polymer electrolyte with the superior chemical stability and the high ion conductivity and a battery using it are provided. A polymer electrolyte (23) contains a polymer compound having a structure in which polyvinyl acetal is polymerized and an electrolytic solution containing a solvent and an electrolyte salt. The solvent contains 80 wt % or more of carbonate ester in which a cyclic compound such as ethylene carbonate and a chain compound such as methyl ethyl carbonate are mixed. The weight ratio between the cyclic compound and the chain compound in carbonate ester is in the range from 2:8 to 5:5. Thereby, high ion conductivity can be obtained. In addition, even when the ratio of carbonate ester in the solvent is increased, the solubility of polyvinyl acetal can be improved.
A polymer electrolyte containing a polymer compound and an electrolyte solution, the polymer compound having a structure in which at least one selected from the group consisting of polyvinyl acetal and derivatives thereof is polymerized, the polymer compound being contained in a range from 0.5 wt % to 5 wt %, the electrolytic solution containing a solvent and an electrolyte salt, wherein:
A battery comprising a cathode, an anode, and a polymer electrolyte wherein:
Dependencies are inferred from the claim text.