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Lithium aluminum hydride Li3AlH6: new insight into the anode material for liquid-state lithium-ion batteries

Published:1 November 2023 DOI: 10.1016/j.heliyon.2023.e21765
Chu Liang, Zhangze Ye, Yaxiong Yang, Huilong Jing, Haihuang Wu, Yanxia Liu, Xiaoyu Zhang, Zhihe Liu, Hongge Pan

Abstract

Metal hydrides have been demonstrated as one of the promising high-capacity anode materials for Li-ion batteries. Herein, we report the electrochemical properties and lithium storage mechanism of a Li-rich complex metal hydride (Li3AlH6). Li3AlH6 exhibits a lithiation capacity of ~1729 mAh/g with a plateau potential of ~0.33 V vs. Li+/Li at the first discharge cycle. Experimental results demonstrate that Li3AlH6 is converted into LiH and LiAl in the initial electrochemical lithiation process. In addition, Li3AlH6 also possesses a good cycling stability that 71 % of the second discharge capacity is retained after 20 cycles. More importantly, the cycling performance of Li3AlH6 can be improved to 100 cycles via adjusting electrolyte composition. This study provides a new approach for developing the lithium storage properties of anode materials for Li-ion batteries.

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