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Dual-Gradient 3D Porous Alloy Current Collectors To Guide Ultrauniform Lithium Deposition in Lithium Metal Batteries.
Chenglin Gao1,2,3, Jianli Kang1,2,3, Yimin Zhang1
1School of Materials Science and Engineering, Tianjin Key Laboratory of Composite and Functional Materials, Tianjin University, Tianjin 300350, PR China.
ACS Nano
|November 27, 2025
Summary
A novel dual-gradient 3D porous current collector (DG-CuMnZn) promotes uniform lithium metal deposition, enhancing lithium metal battery performance and energy density by overcoming the "top effect". This design improves internal space utilization and cycling stability.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Three-dimensional (3D) porous current collectors are crucial for lithium metal batteries, aiming to improve current density distribution and suppress lithium dendrite growth.
- However, the
Purpose of the Study:
- To develop a novel dual-gradient 3D porous current collector (DG-CuMnZn) that guides uniform lithium deposition.
- To enhance the utilization of internal pore space and improve the energy density of lithium metal batteries.
Main Methods:
- A facile annealing-etching approach was employed to fabricate the dual-gradient 3D porous CuMnZn current collector.
- The current collector's elemental and structural gradients were engineered to control lithium deposition pathways.
Main Results:
- The DG-CuMnZn current collector achieved a high internal space utilization efficiency of up to 70%, even in submicrometer pores.
- Full cells utilizing DG-CuMnZn with LiNi0.8Co0.1Mn0.1O2 (NCM811) cathodes demonstrated excellent long-term cycling stability at a low negative/positive (N/P) ratio.
Conclusions:
- The dual-gradient design effectively modulates lithiophilicity and current density, enabling bottom-up lithium deposition and overcoming the
