Electrochemical recovery of lithium from brine by highly stable truncated octahedral LiAl0.1Mn1.9O4

化学工业与工程

Chemcial Industry and Engineering

2025, Vol. 42

Issue (2) :68-79 DOI: 10.13353/j.issn.1004.9533.20230160

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Electrochemical recovery of lithium from brine by highly stable truncated octahedral LiAl_0.1Mn_1.9O₄

LI Jiaming, MENG Xiaorong, WU Zhenpeng

School of Chemistry & Chemical Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China

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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.

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	LI Jiaming
	MENG Xiaorong
	WU Zhenpeng

Keywords： lithium recovery electrochemistry LiMn₂O₄ stability

Received 2023-04-09;

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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,V42(2): 68-79

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