OXIDATION OF Fe–W ALLOY ELECTRODEPOSITS FOR APPLICATION TO ANODES AS LITHIUM ION BATTERIES

Abstract

A citrate–ammonia bath was selected to electrodeposit Fe–W alloys, which exhibit a crystalline structure even if the content of W in the Fe–W alloy is up to 37.8[Formula: see text]wt%. Those alloys could be oxidized partly at 700[Formula: see text]C. Resultant oxides were composed of Fe2O3, Fe3O4 and amorphous products. The composite oxides presented better electrochemical properties than those of the Fe2O3 and Fe3O4 composite formed by oxidation of Fe deposits. For instance, such an electrode demonstrates the reversible capacity of up to 2438.3[Formula: see text]mAh[Formula: see text]g[Formula: see text] (in terms of incremental oxygen) after 100 charge–discharge cycles, while the electrodes of Fe2O3 and Fe3O4 composites formed by oxidation of Fe deposits were of only 667.5[Formula: see text]mAh[Formula: see text]g[Formula: see text].