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Charging process for lithium-ion batteries

  • US 9,899,710 B2
  • Filed: 03/13/2015
  • Issued: 02/20/2018
  • Est. Priority Date: 04/30/2008
  • Status: Active Grant
First Claim
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1. A method of charging a battery comprising:

  • providing a lithium-ion battery comprising a positive electrode having a positive active material, a negative electrode having a negative active material and a capacity that is less than that of the positive electrode, and an electrolyte having a solvent, wherein the negative active material has an average cycling potential versus a lithium reference electrode that is greater than a reduction potential at or below which the solvent reduces; and

    applying a charging voltage to the battery for a duration while the battery is fully charged, wherein the charging voltage and the duration are sufficient to cause a potential of the negative electrode to fall below the reduction potential.

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