Coated pre-lithiated anode material particles and cross-linked polymer coatings
First Claim
1. An anode comprising anode active material particles which are coated by at least one coating, wherein the anode active material particles comprise at least one of Si, Ge, Sn and Al and the at least one coating is at least partly polymeric,wherein the anode active material particles are attached to the polymeric coating provided that the attachment consists of a physical attachment;
- wherein the anode active material particles are coated with the polymeric coating prior to the anode formation;
wherein the polymeric coating forms a polymerized matrix in which the anode active material particles are dispersed uniformly; and
wherein the anode active material particles are pre-lithiated and the at least one coating comprises a hydrophobic conductive polymer.
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Abstract
Improved anodes and cells are provided, which enable fast charging rates with enhanced safety due to much reduced probability of metallization of lithium on the anode, preventing dendrite growth and related risks of fire or explosion. Anodes and/or electrolytes have buffering zones for partly reducing and gradually introducing lithium ions into the anode for lithiation, to prevent lithium ion accumulation at the anode electrolyte interface and consequent metallization and dendrite growth. Various anode active materials and combinations, modifications through nanoparticles and a range of coatings which implement the improved anodes are provided.
68 Citations
14 Claims
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1. An anode comprising anode active material particles which are coated by at least one coating, wherein the anode active material particles comprise at least one of Si, Ge, Sn and Al and the at least one coating is at least partly polymeric,
wherein the anode active material particles are attached to the polymeric coating provided that the attachment consists of a physical attachment; -
wherein the anode active material particles are coated with the polymeric coating prior to the anode formation; wherein the polymeric coating forms a polymerized matrix in which the anode active material particles are dispersed uniformly; and wherein the anode active material particles are pre-lithiated and the at least one coating comprises a hydrophobic conductive polymer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An anode comprising anode active material particles which are coated by at least one coating, wherein the anode active material particles comprise at least one of Si, Ge, Sn and Al and the at least one coating is at least partly polymeric,
wherein the anode active material particles are attached to the polymeric coating provided that the attachment consists of a physical attachment; -
wherein the anode active material particles are coated with the polymeric coating prior to the anode formation; wherein the polymeric coating forms a polymerized matrix in which the anode active material particles are dispersed uniformly; wherein the anode further comprises linker molecules configured to cross-link the polymerized matrix and the anode active material particles physically attached thereto, by binding at least some of anode material particles to the polymerized matrix; and wherein the polymerized matrix comprises polyaniline and the linker molecules have carboxylic groups which chemically bind to oxides of the active material particles and to lone electron pairs on a nitrogen of the aniline monomers in the polyaniline matrix. - View Dependent Claims (13, 14)
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Specification