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US 8,945,774 B2Granted
Additive for lithium ion rechageable battery cells
AssigneeNexeon Limited
InventorsFazlil Coowar, Mamdouh Elsayed Abdelsalam, Michael Jonathan Lain
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Abstract
The present invention claims the addition of vinylene carbonate (VC) and optionally also fluoroethylene carbonate to the electrolyte of lithium ion cells having a structural silicon composite anode, i.e. an anode containing fibers or particles of silicon. The additive significantly improves the cycling performance of the cells. A VC content in the range 3.5-8 wt % based on the weight of the electrolyte has been found to be optimum.
Claims38
A lithium ion rechargeable battery cell comprising:
- a porous anode comprising structured electroactive material-containing particles that are structured to provide space between or within the particles for the expansion of the electroactive material during lithiation;
- a cathode comprising an active material capable of incorporating lithium and also of liberating lithium electrochemically;
- 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.
2 more elements
Dependencies are inferred from the claim text.