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张俊乾, M. Taj, J.Q. Zhang
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-1年11月30日
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张俊乾, Yicheng Song, Bo Lu, Xiang Ji and Junqian Zhang
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-1年11月30日
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张俊乾, Yicheng Song, Xianjun Shao, Zhansheng Guo and Junqian Zhang
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-1年11月30日
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【期刊论文】Diffusion induced stress in layered Li-ion battery electrode plates
张俊乾, Junqian Zhang, Bo Lub, Yicheng Songa, Xiang Ji
Journal of Power Sources 209 (2012) 220– 227,-0001,():
-1年11月30日
In this paper, structural configuration of layered Li-ion battery electrode plates is evaluated by analytically formulating the diffusion induced stress. Both symmetric electrode and asymmetric bilayer electrode are discussed. The thickness ratio and the modulus ratio of current collector to active plate are analytically identified to be the important influence parameters on the stress. Applying a material with smaller elastic modulus for current collector could reduce the peak stresses in both current collector and active plate. Increasing the thickness of current collector would reduce the stress in itself while promote the stress in active plate. Therefore, from mechanical viewpoint on designing an electrode, the material for current collector should be as soft and flexible as possible. And the thickness of current collector should be in an appropriate range. Basically, it should be as small as possible on the precondition that the mechanical strength is satisfied. Finally, effects of three charging conditions, i.e. uniform, galvanostatic, and potentiostatic, on the diffusion induced stress is discussed. It is found the maximum stresses for three cases are linear to the total amount of intercalated lithium ions. Based on the stresses, an optimized charging operation, i.e. first galvanostatic followed by potentiostatic, is suggested.
Lithium battery,, Multilayer electrode,, Current collector,, Lithiation,, Diffusion induced stress
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