通过构建Li2ZnTi3O8@LiAlO2复合物来实现高性能的储锂材料

曲津朋; 赵钰燊; 纪玉瑞; 朱彦荣; 伊廷锋

doi:10.1007/s12613-022-2532-2

Volume 30 Issue 4

Apr. 2023

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文章导航 > 矿物冶金与材料学报（英文） > 2023 > 30(4): 611-620

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://doi.org/10.1007/s12613-022-2532-2

Cite this article as:

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://doi.org/10.1007/s12613-022-2532-2

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研究论文

通过构建Li₂ZnTi₃O₈@LiAlO₂复合物来实现高性能的储锂材料

1)
东北大学材料科学与工程学院，沈阳 110819，中国
2)
河北省电介质与电解质功能材料重点实验室，东北大学秦皇岛分校资源与材料学院，秦皇岛 066004，中国

通讯作者:
伊廷锋 E-mail: tfyihit@163.com

文章亮点

(1) LiAlO₂包覆的Li₂ZnTi₃O₈具有优异的储锂性能。

(2) LiAlO₂良好的电接触提高了Li₂ZnTi₃O₈的电化学性能。

(3) LiAlO₂包覆的Li₂ZnTi₃O₈展示了潜在应用前景。

中文摘要

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。

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Research Article

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

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Abstract

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.
- lithium-ion battery;
- anode;
- Li₂ZnTi₃O₈;
- LiAlO₂;
- lithium storage performance

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