摘要
用纯锂作二次锂电池的负板材料有形成锂枝晶和钝化膜的缺点,采用在铝或其他金属如钙、镁、锡上欠电位沉积锂形成锂合金代替纯锂,对克服上述缺点有一定效果.本文报导了以稀土铝合金代替纯铝作基底欠电位沉积锂,在LiClO<sub>4</sub>/碳酸丙烯酯电解液中稀土对改进电极性能有有益的影响.
The effects of addition of rare earth metals on the electrochemical performance of Li-Al alloy as a negative electrode in secondary lithium battery were studied using cyclicvoltammetry, charge- discharge operation and electrochemical impedance measurement.Li-Al and Li-Al-RE alloys were prepared respectively by underpotential deposition ofLi on pure Al and Al-RE alloys in argon atmosphere and 1M LiClO_4/propylene carbonateelectrolyte at 25℃.The results showed that with addition of ca. 1.0% rare earth elementsthe anodic peak current in the voltammogram of Li-Al alloys increased in a few mA/cm^2for 99% Al matrix and in more than 10mA/cm^2 for 99.9% Al matrix, and the charge-dis-charge efficiencies increased in 10% and 20%, respectively.The reaction resistance of Li-Al-RE alloy was smaller than that of Li-Al alloy.This beneficial effect is likely due tothe nucleation action of the rare-earths as a foreign element in alloy, which changes thestructure of Li-Al alloys and make the insertion and diffusion of Li into Al easier.
出处
《应用化学》
CAS
CSCD
北大核心
1989年第1期85-88,共4页
Chinese Journal of Applied Chemistry
关键词
二次电池
稀土铝合金
锂电极
稀土
Secondary battery
Rare earth-aluminium alloy
Lithium electrode
Rare earth element
