Electrochemical Properties of Cu Current Collector with Li0.5La0.5TiO3 or Si Thin Film as a Li Free Anode

Electrochemical properties of Cu foil current collector with a Li0.5La0.5TiO3 Cu a Si thin film deposited by r.f. sputtering as an anode for Li free battery were evaluated. The Cu foil current collectors were lied in and out of plasma during sputtering process. The X-ray diffraction results indicated that the as-deposited Si and Li0.5La0.5TiO3 thin films in and out of plasma did not show any crystalline difference. The Li0.5La0.5TiO3 film in plasma and Si film out of plasma showed better cyclability since crystalline Li0.5La0.5TiO3 has much higher ionic conductivity and crystalline Si film is much sensitive for volume change during charge-discharge process. These results suggested that the deposition of amorphous Si on Cu foil current collector is much better for fabrication of Li free battery and it can be useful for the unique battery with a cycling number constraint of below 10.