Method for forming thin composite solid electrolyte film for lithium batteries
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United States of America Patent
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Feb 4, 1997
Issued Date -
N/A
app pub date -
Jan 19, 1994
filing date -
Aug 20, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A composite solid electrolyte film is formed by dissolving a lithium salt such as lithium iodide in a mixture of a first solvent which is a cosolvent for the lithium salt and a binder polymer such as polyethylene oxide and a second solvent which is a solvent for the binder polymer and has poor solubility for the lithium salt. Reinforcing filler such as alumina particles are then added to form a suspension followed by the slow addition of binder polymer. The binder polymer does not agglomerate the alumina particles. The suspension is cast into a uniform film.
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