Composite lithium borates and/or phosphates and polymer coatings for active material particles
First Claim
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1. Anode active material particles comprising:
- metalloid cores comprising at least one of Si, Ge and Sn, having diameter in a range of 20-500 nm, anda composite coating on said metalloid cores, said composite coating comprising lithium borates and/or lithium phosphates and polymer molecules,wherein the lithium borates and/or lithium phosphates alternate with polymer molecules within the composite coating, with the lithium borates and/or lithium phosphates interconnecting the polymer molecules, andwherein the polymer molecules are anchored by the lithium borates and/or lithium phosphates to the metalloid cores.
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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.
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9 Claims
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1. Anode active material particles comprising:
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metalloid cores comprising at least one of Si, Ge and Sn, having diameter in a range of 20-500 nm, and a composite coating on said metalloid cores, said composite coating comprising lithium borates and/or lithium phosphates and polymer molecules, wherein the lithium borates and/or lithium phosphates alternate with polymer molecules within the composite coating, with the lithium borates and/or lithium phosphates interconnecting the polymer molecules, and wherein the polymer molecules are anchored by the lithium borates and/or lithium phosphates to the metalloid cores. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification