GO/LiMn<sub>2</sub>O<sub>4</sub>膜电极构建及其提锂性能研究

doi:10.11896/cldb.21040052

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Abstract It is essential to achieve efficient lithium extraction to meet the market demand of lithium products from salt lake brine, geothermal water and seawater. Electrochemical adsorption is a low-cost and environment-friendly technology for lithium extraction, which has great development prospects. Based on the LiMn₂O₄ material, CGO-LiMn₂O₄, LDGO-LiMn₂O₄ and LGO-LiMn₂O₄ were prepared by doping conventional graphene oxide (CGO),low defect graphene oxide (LDGO) and large diameter graphene oxide LGO), respectively, and their lithium extraction properties were investigated as well. The results showed that the addition of different graphene oxide (GO) was beneficial to improving the lithium extraction rate, lithium extraction capacity and Li⁺ selectivity of film electrodes. The film electrode doped with LGO showed the best lithium extraction perfor-mance, the lithium extraction capacity of 35.29 mg/g, the lithium extraction rate of 1.044 mg/(g·min) and the separation coefficient from Mg to Li of 588.30. Combined with the analysis and characterization, it was considered that GO had a large specific surface area, which could provide more ‘Effective lithium ions' for the film electrode surface, thus effectively improving the lithium extraction capacity; at the same time, after the cation was embedded in the GO layer, the layer spacing was fixed, which could block the entry of large radius ions and improve the selectivity for Li⁺. Because LGO had larger plate diameter and higher graphitization degree, the conductivity of the corresponding film electrode was better, and the overall lithium extraction effect was better.

Key words： graphene oxide lithium manganate selectivity electrochemical adsorption

Published: Online: 2022-06-09

CLC number:

TQ15

Fund:National Natural Science Foundation of China (21978064), the Natural Science Foundation of Hebei (B2019202423) and the Natural Science Foundation of Tianjin (19JCYBJC20400).

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	Articles by authors
	ZHANG Fan
	JI Zhiyong
	WANG Jing
	GUO Zhiyuan
	FANG Jiawei
	GUO Xiaofu
	ZHAO Yingying
	LIU Jie
	YUAN Junsheng

Cite this article:

ZHANG Fan,JI Zhiyong,WANG Jing, et al. Study on the Preparation of GO/LiMn₂O₄ Film Electrode and Its Lithium Extraction Property[J]. Materials Reports, 2022, 36(11): 21040052-7.

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http://www.mater-rep.com/EN/10.11896/cldb.21040052 OR http://www.mater-rep.com/EN/Y2022/V36/I11/21040052

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