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 (LiAlH). LiAlH 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 LiAlH is converted into LiH and LiAl in the initial electrochemical lithiation process. In addition, LiAlH also possesses a good cycling stability that 71 % of the second discharge capacity is retained after 20 cycles. More importantly, the cycling performance of LiAlH 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.

中文翻译：

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氢化铝锂Li3AlH6：液态锂离子电池负极材料的新见解

金属氢化物已被证明是一种有前途的锂离子电池高容量负极材料。在此，我们报告了富锂复合金属氢化物（LiAlH）的电化学性能和储锂机制。 LiAlH 的锂化容量为 ∼1729 mAh/g，在第一次放电循环时相对于 Li/Li 的平台电位为 ∼0.33 V。实验结果表明，LiAlH 在初始电化学锂化过程中转化为 LiH 和 LiAl。此外，LiAlH还具有良好的循环稳定性，20次循环后仍保留71%的二次放电容量。更重要的是，通过调整电解质成分，LiAlH的循环性能可以提高到100次循环。这项研究为开发锂离子电池负极材料的储锂性能提供了一种新方法。