BUFFERING ZONE FOR PREVENTING LITHIUM METALLIZATION ON THE ANODE OF LITHIUM ION BATTERIES
First Claim
1. An anode comprising anode active material particles, wherein the anode active material particles have, at a surface thereof, a buffering zone configured to receive lithium ions from an interface of the anode active material particles with an electrolyte, partly mask a positive charge of the received lithium ions, and enable the partly masked lithium ions to move into an inner zone of the anode active material particles for lithiation therein, wherein the buffering zone comprises a plurality of electron donating groups interspaced between non-electron donating groups at a ratio of at least 1:
- 2.
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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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11 Claims
- 1. An anode comprising anode active material particles, wherein the anode active material particles have, at a surface thereof, a buffering zone configured to receive lithium ions from an interface of the anode active material particles with an electrolyte, partly mask a positive charge of the received lithium ions, and enable the partly masked lithium ions to move into an inner zone of the anode active material particles for lithiation therein, wherein the buffering zone comprises a plurality of electron donating groups interspaced between non-electron donating groups at a ratio of at least 1:
- 8. A method comprising configuring anode active material particles to have, at a surface thereof, a buffering zone configured to receive lithium ions from an interface of the anode active material particles with an electrolyte, partially mask a positive charge of the received lithium ions, and enable the partially masked lithium ions to move into an inner zone of the anode active material particles for lithiation therein, wherein the buffering zone is further configured to comprise a plurality of electron donating groups interspaced between non-electron donating groups at a ratio of at least 1:
Specification