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

Chu Liang; Zhangze Ye; Yaxiong Yang; Huilong Jing; Haihuang Wu; Yanxia Liu; Xiaoyu Zhang; Zhihe Liu; Hongge Pan

doi:10.1016/j.heliyon.2023.e21765

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

Heliyon. 2023 Nov 2;9(11):e21765. doi: 10.1016/j.heliyon.2023.e21765. eCollection 2023 Nov.

Authors

Chu Liang^{1

2}, Zhangze Ye¹, Yaxiong Yang³, Huilong Jing¹, Haihuang Wu¹, Yanxia Liu³, Xiaoyu Zhang¹, Zhihe Liu⁴, Hongge Pan^{1

3

2}

Affiliations

¹ Zhejiang Carbon Neutral Innovation Institute & Moganshan Institute of ZJUT at Deqing, Zhejiang University of Technology, Hangzhou 310014, China.
² School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China.
³ Institute of Science and Technology for New Energy Xi'an Technological University Xi'an 710021, China.
⁴ Department of Chemical and Biomolecular Engineering National University of Singapore 4 Engineering Drive 4, Singapore 117585, Singapore.

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.