Enhanced Cycle Life of Si Anode for Li-Ion Batteries by Using Modified Elastomeric Binder

Abstract

Cycle-life of the particulate electrode of Si, either with or without carbon coating, for Li-ion battery has significantly been improved by using a modified elastomeric binder containing styrene-butadiene-rubber (SBR) and sodium-carboxyl-methyl-cellulose (SCMC). Compared with poly-vinylidene-fluoride (PVdF), the mixture binder shows smaller moduli, a larger maximum elongation, a stronger adhesion strength on Cu current collector, and much smaller solvent-absorption in organic carbonate. There were demonstrated cycle lives of for bare Si at 600 mAh/g or carbon-coated Si at 1000 mAh/g, as contrast to for PVdF-bound electrode in all cases. © 2004 The Electrochemical Society. All rights reserved.