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Jinpeng Qu, Yushen Zhao, Yurui Ji, Yanrong Zhu, and Tingfeng Yi, Approaching high-performance lithium storage materials by constructing Li2ZnTi3O8@LiAlO2 composites, Int. J. Miner. Metall. Mater., 30(2023), No. 4, pp.611-620. https://dx.doi.org/10.1007/s12613-022-2532-2
Jinpeng Qu, Yushen Zhao, Yurui Ji, Yanrong Zhu, and Tingfeng Yi, Approaching high-performance lithium storage materials by constructing Li2ZnTi3O8@LiAlO2 composites, Int. J. Miner. Metall. Mater., 30(2023), No. 4, pp.611-620. https://dx.doi.org/10.1007/s12613-022-2532-2
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通过构建Li2ZnTi3O8@LiAlO2复合物来实现高性能的储锂材料

摘要: 立方尖晶石结构的Li2ZnTi3O8(LZTO)具有成本低和安全性高的优势,被认为是代替碳材料作为锂离子电池负极材料的理想选择。然而,Li+和Zn2+离子位于LZTO的四面体位点,在一定程度上阻碍了离子的迁移,导致LZTO电导率差,锂离子扩散系数低。LiAlO2的包覆有效避免了电极表面与有机电解质的接触,从而减少了副反应的发生。因此,本文采用简单的高温固相法合成了Li2ZnTi3O8@LiAlO2复合材料。结果表明:LiAlO2改性未改变LZTO的形貌和粒径,但是提高了其结构稳定性、锂离子脱嵌的可逆性和电化学活性,促进了锂离子的迁移。Li2ZnTi3O8@LiAlO2 (8wt%)在0.5 C、1 C、2 C、3 C和5 C时的充电容量分别为203.9、194.8、187.4、180.6和177.1 mAh·g−1,表现出良好的倍率性能。然而,在相同的倍率下,纯LZTO仅有134.5、109.7、89.4、79.9和72.9 mAh·g−1的容量。即使在较大的充放电倍率下,Li2ZnTi3O8@LiAlO2(8wt%)材料也表现出良好的循环性能。在5 C倍率循环150次后后,Li2ZnTi3O8@LiAlO2(8wt%)仍具有263.5/265.8 mAh·g−1的充放电容量。LiAlO2的引入增强了LZTO材料的电子导电性,使Li2ZnTi3O8@LiAlO2复合材料具有优异的电化学性能。

 

Approaching high-performance lithium storage materials by constructing Li2ZnTi3O8@LiAlO2 composites

Abstract: The Li2ZnTi3O8@LiAlO2 was synthesized by a facile high-temperature solid-state route. The LiAlO2 modification does not alter the morphology and particle size of Li2ZnTi3O8 (LZTO). The LiAlO2 modification improves the structure stability, intercalation/deintercalation reversibility of lithium-ions, and electrochemical reaction activity of Li2ZnTi3O8, and promotes the transfer of lithium ions. Benefited from the unique component, Li2ZnTi3O8@LiAlO2 (8wt%) shows a good rate performance with charge capacities of 203.9, 194.8, 187.4, 180.6, and 177.1 mAh·g−1 at 0.5, 1, 2, 3, and 5 C, respectively. Nevertheless, pure LZTO only delivers charge capacities of 134.5, 109.7, 89.4, 79.9, and 72.9 mAh·g−1 at the corresponding rates. Even at large charge–discharge rate, the Li2ZnTi3O8@LiAlO2 (8wt%) composite indicates a good cycle performance with a high reversible charge/discharge capacity of 263.5/265.8 mAh·g−1 at 5 C after 150 cycles. The introduction of LiAlO2 on the surface of Li2ZnTi3O8 enhances electronic conductivity of the composite, resulting in the good electrochemical performance of Li2ZnTi3O8@LiAlO2 composite. Li2ZnTi3O8@LiAlO2 (8wt%) composite shows a good potential as an anode material for the next generation of high-performance Li-ion batteries.

 

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