Polymer electrolyte and polymer lithium battery
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United States of America Patent
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Aug 2, 2005
Grant Date -
N/A
app pub date -
Apr 9, 2003
filing date -
Apr 9, 2002
priority date (Note) -
Expired
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Abstract
A polymer electrolyte includes a substrate polymer, a branched polymer, and a lithium salt. The branched polymer has a main chain whose repeating unit is composed of an oligoethylene oxide chain and a connector molecule bonded to the oligoethylene oxide chain. The branched polymer can be a hyperbranched polymer. The polymer electrolyte can further include a composite oxide and/or a boroxine compound. The polymer electrolyte is good in terms of the ionic conductivity, and exhibits a high ionic conductivity especially at low temperatures. When the polymer electrolyte is used to make polymer lithium batteries, the resulting polymer lithium batteries shows improved charge-discharge cycle characteristics. In particular, it is possible to operate the polymer lithium batteries at low temperatures.
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