リチウムイオン電池負極用黒鉛へのシリコンコーティング

Abstract

In present study，silicon was coated on the high crystalline graphite particles as core carbon using chemical vapor deposition technique， and effect of the thin film silicon coating on electrochemical properties was examined. Crystalline silicon was deposited on core graphite particles without the formation of SiC that was inert with lithium. Charge capacity (Li de-intercalation) of the pristine carbon was successfully increased up to 650 and 1120 mAh/g by coating with 12.1 and 29.6 mass% silicon， respectively. Capacity was significantly decreased during the charge-discharge cycling for the sample of the graphite coated with 29.6 mass% silicon. Cycle ability was improved by decrease of the thickness of silicon film.