Separators for electrochemical cells
AssigneesLG Energy Solution, Ltd., Sihl GmbH
InventorsZhong Xu, Steven A. Carlson
Life of this patent
Estimating the term…
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.
Claims16
A method of coating a substrate for a battery separator comprising the steps of:
- (a) providing a dispersion of hydrated aluminum oxide that is dispersible in aprotic solvents;
- (b) providing an organic polymer solution comprising an organic polymer that is soluble in aprotic solvents;
- (c) mixing the dispersion of step (a) and the solution of step (b) so as to make a mixture;
- and
- (d) forming a coating on a substrate by applying the mixture of step (c) onto the substrate.
A method of making an electric current-producing cell comprising the steps of:
- (a) providing an anode;
- (b) providing a cathode;
- and
- (c) interposing a microporous separator between the anode and the cathode to form an electric current-producing cell, wherein the microporous separator comprises a microporous layer comprising:
- a hydrated aluminum oxide that is dispersible in aprotic solvents and an organic polymer that is soluble in aprotic solvents.
Dependencies are inferred from the claim text.