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Citation: Chang Yuqin, Huo Guoyan, Zhao Minshou, Jiang Zhiyun. THE EFFECT OF RARE EARTH ON THE ELECTRO-CHEMICAL PERFORMANCE OF Li-Al ALLOY AS A NEGATIVE ELECTRODE IN SECONDARY LITHIUM BATTERY[J]. Chinese Journal of Applied Chemistry, ;1989, 6(1): 85-88. shu

THE EFFECT OF RARE EARTH ON THE ELECTRO-CHEMICAL PERFORMANCE OF Li-Al ALLOY AS A NEGATIVE ELECTRODE IN SECONDARY LITHIUM BATTERY

1.
Changchun Institute of Applied Chemistry, Academia Sinica

Received Date: 31 December 1987
Available Online: 13 April 1988

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 cyclic voltammetry, charge-discharge operation and electrochemical impedance measurement.Li-Al and Li-Al-RE alloys were prepared respectively by underpotential deposition of Li on pure Al and Al-RE alloys in argon atmosphere and 1M LiClO₄/propylene carbonate electrolyte at 25℃.The results showed that with addition of ca. 1.0% rare earth elements the anodic peak current in the voltammogram of Li-Al alloys increased in a few mA/cm² for 99% Al matrix and in more than 10mA/cm² for 99.9% Al matrix, and the charge-discharge 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 to the nucleation action of the rare-earths as a foreign element in alloy, which changes the structure of Li-Al alloys and make the insertion and diffusion of Li into Al easier.
- Secondary battery,
- Rare earth-aluminium alloy,
- Lithium electrode,
- Rare earth element
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