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Additive for lithium ion rechargeable battery cells

  • US 9,368,836 B2
  • Filed: 12/11/2014
  • Issued: 06/14/2016
  • Est. Priority Date: 06/07/2010
  • Status: Active Grant
First Claim
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1. A lithium ion rechargeable battery cell comprising:

  • an anode comprising electroactive material-containing particles wherein the electroactive material is selected from one or more of silicon, germanium and tin;

    a cathode comprising an active material adapted to incorporate lithium and also to liberate lithium electrochemically, wherein the anode is adapted to incorporate lithium during lithiation; and

    an electrolyte;

    wherein the electrolyte comprises both a cyclic carbonate including a vinyl group and a fluorinated cyclic carbonate, wherein the total amount of the cyclic carbonate including a vinyl group and the fluorinated cyclic carbonate together is in the range 3.5 wt % to 70 wt % based on the total weight of the electrolyte solution.

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