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| 2023-10-31 09:39:00 | onclick： | Research reveals concentration regulation mechanism in zinc electrodeposition |
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Tan Peng's team revealed the mechanism of concentration regulation during zinc electrodeposition, which provides a strategy for zinc homogeneous deposition of next-generation water-based zinc batteries.On October 23, the research results were published online in the Proceedings of the National Academy of Sciences.
Because of its advantages of high energy density, high safety and low cost, aqueous zinc-based batteries have great potential in the next generation of large-In order to achieve uniform and highly reversible zinc deposition, many strategies, such as changing electrode structure and specific surface area, introducing coating modification and applying additives, have been reported.In fact, zinc deposition is a crystalline precipitation process from liquid to solid phase, which is closely related to ion concentration in electrolytes.However, the mechanism of ion transport kinematics during zinc electrodeposition lacks systematic and in-depth research.
Through electrochemical testing, morphological characterization and multi-scale simulation, the research team revealed the competitive relationship between thermodynamics and dynamics during zinc electrodeposition.
Firstly, the competitive relationship between thermodynamics and dynamics of zinc electrodeposition is revealed by molecular dynamics and finite element simulation.Based on single crystal copper matrix, the initial zinc crystal growth is thermodynamically controlled epitaxial growth, and with the electrodeposition, the ion concentration at the electrode electrolyte interface decreases rapidly.
Furthermore, combined with morphological characterization and phase field model, the morphological evolution of zinc electrodeposition due to concentration change is revealed.At first, Zn deposition is a layered structure composed of several two-dimensional sheets. Different layers of two-dimensional sheets lead to convexity and depression in the local area.
Finally, the regulation mechanism of concentration in zinc electrodeposition was verified by relaxation, and two important factors affecting relaxation time were analyzed.The results show that relaxation time is positively correlated with both, and is more sensitive to electrode distance, because slow diffusion rate is more obvious in long distance transport.
The team successfully revealed the ion concentration mechanism in zinc electrodeposition process, providing important guidance for uniform deposition of metal-based batteries with phase transition.
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