METHODS FOR PREPARING ANODES FROM ANODE ACTIVE MATERIAL PARTICLES WITH LITHIUM BORATES AND PHOSPHATES COATINGS
First Claim
1. A method for preparing a lithium ion cell, comprising:
- replacing a native oxide on a surface of anode active material particles that comprise at least one of Si, Ge, Sn and Al, by a layer of B2O3,coating the anode active material particles by at least one coating that comprises at least one of a boron oxide, a phosphorus oxide, a borate, a phosphate and/or salts thereof,preparing an anode from the anode active material particles, andpreparing a lithium ion cell using the prepared anode.
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Accused Products
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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Citations
19 Claims
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1. A method for preparing a lithium ion cell, comprising:
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replacing a native oxide on a surface of anode active material particles that comprise at least one of Si, Ge, Sn and Al, by a layer of B2O3, coating the anode active material particles by at least one coating that comprises at least one of a boron oxide, a phosphorus oxide, a borate, a phosphate and/or salts thereof, preparing an anode from the anode active material particles, and preparing a lithium ion cell using the prepared anode. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of making an anode for a lithium-ion energy storage device, comprising milling anode active material particles selected from Si, Ge, Sn, Al, mixtures thereof, and/or alloys thereof—
- in a non-oxidizing atmosphere with at least one boron oxide compound and/or phosphorus oxide compound to form milled particles having a coating on the particles selected from the group consisting of a boron oxide, a phosphorus oxide, a borate and/or a phosphate, having a thickness in a range of 2 nm to 200 nm.
- View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method for making a lithium ion cell comprising:
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coating anode active material particles that comprise at least one of Si, Ge, Sn and Al—
by at least one coating that comprises at least one of a boron oxide, a phosphorus oxide, a borate, a phosphate and/or salts thereof, at least one lithiated conductive polymer, and/or a hydrophobic conductive polymer which has conjugated aromatic groups and is ionic conductive,preparing an anode from the coated anode active material particles, and preparing a lithium ion cell using the prepared anode. - View Dependent Claims (16, 17, 18, 19)
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Specification