Separators for electrochemical cells
AssigneesSihl GmbH, Optodot Corporation
InventorsZhong Xu, Steven A. Carlson
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Abstract
Provided are separators for use in batteries and capacitors comprising (a) at least 50% by weight of an aluminum oxide and (b) an organic polymer, wherein the aluminum oxide is surface modified by treatment with an organic acid to form a modified aluminum oxide, and wherein the treatment provides dispersibility of the aluminum oxide in aprotic solvents such as N-methyl pyrrolidone. Preferably, the organic acid is a sulfonic acid, such as p-toluenesulfonic acid. Also preferably, the organic polymer is a fluorinated polymer, such as polyvinylidene fluoride. Also provided are electrochemical cells and capacitors comprising such separators.
Claims20
A separator for an electric current producing cell, wherein said separator comprises a microporous layer comprising (a) at least 50% by weight of an aluminum oxide and (b) an organic polymer, wherein said aluminum oxide is surface modified by treatment with an organic acid to form a modified aluminum oxide, and wherein said treatment provides dispersibility of said aluminum oxide in aprotic solvents, and said organic polymer comprises a first fluorinated organic monomer and a second organic monomer or said organic polymer comprises a polyvinylidene fluoride polymer.
An electrochemical cell comprising an anode, a cathode, an organic electrolyte comprising a lithium salt, and a separator interposed between said anode and said cathode, wherein said separator comprises a microporous layer comprising (a) at least 50% by weight of an aluminum oxide and (b) an organic polymer, wherein said aluminum oxide is surface modified by treatment with an organic acid to form a modified aluminum oxide, and wherein said treatment provides dispersibility of said aluminum oxide in aprotic solvents, and said organic polymer comprises a first fluorinated organic monomer and a second organic monomer or said organic polymer comprises a polyvinylidene fluoride polymer.
A capacitor comprising two electrodes, an organic electrolyte comprising a tetraalkyl ammonium salt, and a separator interposed between said two electrodes, wherein said separator comprises a microporous layer comprising (a) at least 50% by weight of an aluminum oxide and (b) an organic polymer, wherein said aluminum oxide is surface modified by treatment with an organic acid to form a modified aluminum oxide, and wherein said treatment provides dispersibility of said aluminum oxide in aprotic solvents, and said organic polymer comprises a first fluorinated organic monomer and a second organic monomer or said organic polymer comprises a polyvinylidene fluoride polymer.
Dependencies are inferred from the claim text.