AN ADDITIVE FOR LITHIUM ION RECHARGEABLE BATTERY CELLS

摘要

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 fibres 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.