Constructing the 3D-conductive network-incorporated thick electrodes via melamine foam for lithium extraction

Journal article (2024)

Authors

Junyi Zhang Chengdu University of Technology
Yuan Zhou Chengdu University of Technology
Chunxi Hai Chengdu University of Technology
Yawen Gao Chengdu University of Technology
Yan Zhao Chengdu University of Technology
Yanxia Sun Chengdu University of Technology
Shengde Dong Chengdu University of Technology
H. Su Deakin University
Luxiang Ma Chengdu University of Technology
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Published Date

2024

Language

English

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Abstract

Improving the kinetic performance of thick electrodes is key to enhancing lithium extraction from salt lakes. Nano-melamine foam (MF), known for its unique porous structure, is ideal for building a three-dimensional (3D) conductive network, thereby boosting electrode kinetics. In our study, we developed a thick electrode (20 mg·g−1) with a 3D-conductive network by in-situ growing LiFePO4 (LFP) onto a nanoscale MF substrate. This electrode exhibited superior kinetic performance and a high lithium adsorption capacity in brine, achieving up to 32.8 mg·g−1 in just 10 min. Remarkably, even in simulated brine with a high Mg2+/Li+ ratio, it maintained an average coulomb efficiency of 62 %, significantly lowering the Mg2+/Li+ ratio from 65.6 to 0.47. It also showed exceptional stability in actual brine, maintaining an average coulomb efficiency of about 56.6 %. Our development of this high conductivity, thick electrode provides new insights into efficient lithium extraction methods.