Citation: Hui Zhang, Zijian Zhao, Yajing Wang, Kai Ni, Yanfei Wang, Liang Zhu, Jianyun Liu, Xiaoyu Zhao. Structurally engineered solvent-free LiFePO₄ electrodes via hot-pressing with efficient ion transport pathways for lithium extraction from brine[J]. Acta Physico-Chimica Sinica, ;2026, 42(2): 100130. doi: 10.1016/j.actphy.2025.100130 shu

Structurally engineered solvent-free LiFePO₄ electrodes via hot-pressing with efficient ion transport pathways for lithium extraction from brine

Hui Zhang ^{1, †} ,
Zijian Zhao ^{1, †} ,
Yajing Wang ¹ ,
Kai Ni ¹ ,
Yanfei Wang ^1,, ,
Liang Zhu ² ,
Jianyun Liu ^3,, ,
Xiaoyu Zhao ^{1, 2,,}

1.
Tianjin Key Laboratory of Brine Chemical Engineering and Resource Eco-utilization, College of Chemical Engineering and Materials Science, Tianjin University of Science and Technology, Tianjin 300457, China
2.
State Key Laboratory of Bio-based Fiber Materials, Tianjin University of Science and Technology, Tianjin 300457, China
3.
College of Environmental Science and Engineering, Textile Pollution Controlling Engineering Centre of Ministry of Ecology and Environment, Donghua University, Shanghai 201620, China

Corresponding author: Yanfei Wang, wangyanfei@tust.edu.cn Jianyun Liu, jianyun.liu@dhu.edu.cn Xiaoyu Zhao, xyz@tust.edu.cn
Received Date: 6 June 2025
Revised Date: 8 July 2025
Accepted Date: 14 July 2025

The development of high-mass-loading electrodes with robust ion transport characteristics is crucial for efficient electrochemical lithium extraction from brine. Herein, we report a solvent-free hot-pressing strategy to fabricate structurally engineered LiFePO₄ electrodes with enhanced electrochemical performance and mechanical stability. By integrating etched titanium foil as a current collector and multi-walled carbon nanotubes as a conductive additive, a three-dimensionally interconnected porous structure was formed, enabling accelerated ion diffusion and improved structural integrity. Micro-CT and Avizo-based analysis revealed that the dry press-coated electrodes possess higher porosity, lower tortuosity and more connected ion channels compared to conventional slurry-coated electrodes. Electrochemical tests demonstrated a significantly higher lithium-ion diffusion coefficient and lower charge transfer resistance of the dry press-coated electrodes. Under optimized conditions, the dry press-coated electrodes, possessing a mass loading of 19.4 mg cm^-2, delivered a lithium extraction capacity of 4.13 mg cm^-2 with a purity of 93.91% over 15 cycles in simulated Uyuni brine. This work establishes a scalable hot-pressing method and elucidates its fundamental physicochemical advantages for lithium-selective electrochemical separation.
- Hot-pressing,
- Solvent-free,
- Ions transport pathways,
- Electrochemical lithium extraction
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沈阳化工大学材料科学与工程学院沈阳 110142

Structurally engineered solvent-free LiFePO4 electrodes via hot-pressing with efficient ion transport pathways for lithium extraction from brine

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通讯作者: 陈斌, bchen63@163.com

Structurally engineered solvent-free LiFePO₄ electrodes via hot-pressing with efficient ion transport pathways for lithium extraction from brine