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US 5,965,299 AGranted
Composite electrolyte containing surface modified fumed silica
AssigneesNorth Carolina State University, Michigan State University
InventorsSaad A. Khan, Peter S. Fedkiw, Gregory L. Baker, Jiang Fan, Srinivasa R. Raghavan, Jun Hou
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Abstract
A composite electrolyte comprises (a) surface modified fumed silica filler, wherein the surface modified fumed silica comprises polymerizable groups on the surface thereof, the polymerizable groups being bonded to each other such that the surface modified fumed silica filler is crosslinked in a three-dimensional structure; (b) a dissociable lithium salt; and (c) a bulk medium which contains the surface modified fumed silica filler and the dissociable lithium salt. An electrochemical cell comprises an anode, a cathode, and a composite electrolyte dispersed between the anode and cathode.
Claims52
A composite electrolyte comprising:
- (a) a filler comprising surface modified fumed silica particles, wherein said surface modified fumed silica comprises polymerizable groups on the surface thereof, said polymerizable groups being covalently bonded to each other in a chemical reaction such that said surface modified fumed silica filler is bridged by polymer chains formed from the polymerizable groups, the surface modified fumed silica filler being crosslinked and present as a three-dimensional structure and;
- (b) a dissociable lithium salt;
- and
- (b) a bulk medium which contains said surface modified fumed silica filler and said dissociable lithium salt.
1 more element
An electrochemical cell comprising:
- (a) an anode;
- (b) a cathode;
- and
- (c) interposed between said anode and said cathode, a composite electrolyte, wherein said composite electrolyte comprises:
- (i) a filler comprising surface modified fumed silica particles, wherein said surface modified fumed silica comprises polymerizable groups on the surface thereof, said polymerizable groups being covalently bonded to each other in a chemical reaction such that said surface modified fumed silica filler is bridged by polvmer chains formed from the polymerizable groups, the surface modified fumed silica filler being crosslinked and present as a three-dimensional structure;
- (ii) a dissociable lithium salt;
- and
- (iii) a bulk medium which contains said surface modified fumed silica filler and said dissociable lithium salt.
5 more elements
A battery comprising:
- (a) an anode;
- (b) a cathode;
- and
- (c) interposed between said anode and said cathode, a composite electrolyte, wherein said composite electrolyte comprises:
- (i) a filler comprising surface modified fumed silica particles, wherein said surface modified fumed silica comprises polymerizable groups on the surface thereof, said polymerizable groups being covalently bonded to each other in a chemical reaction such that said surface modified fumed silica filler is bridged by polymer chains formed from the polymerizable groups, the surface modified fumed silica filler being crosslinked and present as a three-dimensional structure;
- (ii) a dissociable lithium salt;
- and
- (iii) a bulk medium which contains said surface modified fumed silica filler and said dissociable lithium salt.
5 more elements
A method of producing a composite electrolyte comprising:
- reacting fumed silica with a surface monomer to modify the surface of the fumed silica, wherein polymerizable groups become present on the surface of the fumed silica;
- contacting the fumed silica with a bulk medium comprising a dissociable lithium salt, an initiator, and a monomer which does not react with the surface of the fumed silica but is capable of reacting with the polymerizable groups;
- processing the mixture into a defined geometry;
- and
- polymerizing the mixture such that the polymerizable groups on the surface of the fumed silica become covalently bonded to each other in a chemical reaction such that the surface modified fumed silica filler is bridged by polymer chains formed from the polymerizable groups, and wherein a three-dimensional composite electrolyte structure is formed.
2 more elements
A composite electrolyte comprising:
- (a) a surface modified fumed silica filler, wherein said surface modified fumed silica comprises polymerizable groups on the surface thereof, said polymerizable groups being covalently bonded to each other in a chemical reaction such that said surface modified fumed silica filler is bridged by polymer chains formed from the polymerizable groups, the surface modified fumed silica being crosslinked and present as a three-dimensional structure, and wherein said surface modified fumed silica filler has at least one methacrylate-terminated oligomeric chain on the surface thereof;
- (b) a dissociable lithium salt;
- and
- (c) a bulk medium which contains said surface modified fumed silica filler and said dissociable lithium salt.
1 more element
An electrochemical cell comprising:
- (a) an anode;
- (b) a cathode;
- and
- (c) interposed between said anode and said cathode, a composite electrolyte, wherein said composite electrolyte comprises:
- (i) surface modified fumed silica filler, wherein said surface modified fumed silica comprises polymerizable groups on the surface thereof, said polymerizable groups being covalently bonded to each other in a chemical reaction such that said surface modified fumed silica filler is bridged by polymer chains formed from the polymerizable groups, the surface modified fumed silica being crosslinked and present as a three-dimensional structure, and wherein said surface modified fumed silica filler has at least one methacrylate-terminated oligomeric chain on the surface thereof;
- (ii) a dissociable lithium salt;
- and
- (iv) a bulk medium which contains said surface modified fumed silica filler and said dissociable lithium salt.
5 more elements
A battery comprising:
- (a) an anode;
- (b) a cathode;
- and
- (c) interposed between said anode and said cathode, a composite electrolyte, wherein said composite electrolyte comprises:
- (i) surface modified fumed silica filler, wherein said surface modified fumed silica comprises polymerizable groups on the surface thereof, said polymerizable groups being bonded covalently to each other in a chemical reaction such that said surface modified fumed silica filler is bridged by polymer chains formed from the polymerizable groups, the surface modified fumed silica being crosslinked and present as a three-dimensional structure, and wherein said surface modified fumed silica filler has at least one methacrylate-terminated oligomeric chain on the surface thereof;
- (ii) a dissociable lithium salt;
- and
- (iii) a bulk medium which contains said surface modified fumed silica filler and said dissociable lithium salt.
5 more elements
A method of producing a composite electrolyte comprising:
- reacting fumed silica with a surface reactive monomer to modify the surface of the fumed silica, wherein a polymerizable group becomes present on the surface of the fumed silica, said surface modiifed fumed silica filler having a methacrylate-terminated oligomeric chain on the surface thereof;
- contacting said fumed silica with a bulk medium comprising a dissociable lithium salt, an initiator, and a monomer which does not react with the surface of the fumed silica but is capable of reacting with the polymerizable group;
- processing the mixture into a defined geometry where the fumed silica filler is bridged by polymer chains formed from the polymerizable group;
- and
- polymerizing the mixture such that the polymerizable groups on the surface of the fumed silica become bonded and a three-dimensional composite structure is formed.
2 more elements
Dependencies are inferred from the claim text.