高稳定性LiAl0.1Mn1.9O4用于电化学卤水提锂

摘要基于LiMn₂O₄的电化学提锂系统因其提锂效率高、选择性好及绿色无污染的优点成为一种极具发展前景的提锂技术,然而稳定性不足限制其进一步的发展。基于此,制备了一种铝掺杂的LiAl_0.1Mn_1.9O₄提锂电极材料。Al³⁺的掺入有效提升了Li⁺的扩散速率,同时有效抑制Jahn-Teller效应。在连续恒流充放电测试中,LiAl_0.1Mn_1.9O₄电极的容量保持率达到67%,而LiMn₂O₄电极仅为42%,表明LiA1_0.1Mn_1.9O₄具有更好的电化学稳定性。模拟电化学提锂LiAl_0.1Mn_1.9O₄电极表现出了较高的提锂容量(25.17 mg·g^-1)、稳定的循环提锂性能(90.58%)和较低的能耗(15.52 Wh·mol^-1)。最后在镁锂比为46.31的东台吉乃尔盐湖卤水中连续10次提锂实验中,LiAl_0.1Mn_1.9O₄电极依旧保持了较高的提锂容量(19.75 mg·g^-1)和锂镁分离性能(α_Li-Mg=118.74),10次提锂容量保持率达到90.2%。这些优异的性能使得LiAl_0.1Mn_1.9O₄电极在电化学提锂中具有实际应用价值。

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	李嘉明
	孟晓荣
	吴振鹏

关键词：锂回收电化学锰酸锂稳定性

Abstract： LiMn₂O₄-based electrochemical lithium extraction systems have become a highly promising lithium extraction technology due to their high lithium extraction efficiency, good selectivity, and green and non-polluting advantages. However, the lack of stability limits its further development. In this study, an aluminum-doped LiAl_0.1Mn_1.9O₄ lithium extraction electrode material was prepared, and the doping of Al³⁺ effectively enhanced the diffusion rate of Li⁺ and suppressed the Jahn-Teller effect. In the continuous constant current charge/discharge test, the LiAl_0.1Mn_1.9O₄ electrode achieved 67% capacity retention compared to 42% for the LiMn₂O₄ electrode, indicating that LiA1_0.1Mn_1.9O₄ has better electrochemical stability. The simulated electrochemical lithium extraction LiAl_0.1Mn_1.9O₄ electrode exhibited high lithium extraction capacity (25.17 mg·g^-1), stable cyclic lithium extraction performance (90.58%), and low energy consumption (15.52 Wh·mol^-1). Finally, the LiAl_0.1Mn_1.9O₄ electrode maintained a high lithium extraction capacity (19.75 mg·g^-1) and lithium-magnesium separation performance (α_Li-Mg=118.74) in 10 consecutive lithium extraction experiments in the brine of East Taijiner Brine with a Mg-lithium ratio of 46.31, and the lithium extraction capacity retention rate reached 90.2% over 10 cycles. These excellent properties make the LiAl_0.1Mn_1.9O₄ electrode valuable for practical applications in electrochemical lithium extraction.

Keywords： lithium recovery electrochemistry LiMn₂O₄ stability

Received 2023-04-09;

Fund:国家重点研究发展计划(2022YFC2904304-01);陕西省技术创新引导专项——重点研发计划三项改革项目(2023GXLH-060)。

Corresponding Authors: 孟晓荣,教授,mxr5@163.com。 Email: mxr5@163.com

About author: 李嘉明(1994—),男,硕士研究生,现从事盐湖资源开发方面研究。

引用本文:

李嘉明, 孟晓荣, 吴振鹏.高稳定性LiAl_0.1Mn_1.9O₄用于电化学卤水提锂[J]. 化学工业与工程, 2025,42(2): 68-79

LI Jiaming, MENG Xiaorong, WU Zhenpeng.Electrochemical recovery of lithium from brine by highly stable truncated octahedral LiAl_0.1Mn_1.9O₄[J]. Chemcial Industry and Engineering, 2025,42(2): 68-79

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