Stress self-relaxation arising from diffusion-induced creep in bilayer lithium-ion battery electrode

Stress self-relaxation arising from diffusion-induced creep in bilayer lithium-ion battery electrode
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双层锂离子电池电极扩散诱导蠕变引起的应力自松弛

DOI:
10.1016/j.scriptamat.2018.03.023
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发表时间:
2018-06
期刊:
影响因子:
6
通讯作者:
Zhao Xiang
Zhao Xiang
中科院分区:
材料科学1区
文献类型:
--
作者:
Lu Yongjun;Che Qi;Song Xu;Wang Fenghui;Zhao Xiang

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本文研究了电化学充放电引起的蠕变变形对双层电极机械回弹性的影响。为此,提出了一个新的理论模型,结合锂扩散,蠕变变形,和诱导应力。结果表明,扩散诱发蠕变是锡基双层电极应力松弛和容量提高的重要机制。此外,由于蠕变的引入,所产生的应力应取决于与扩散、施加的通量和蠕变松弛相关的时间尺度之间的相互作用。
In this paper, we study the role of creep deformation arising from electrochemical charging and discharging on the mechanical resilience of bilayer electrode. For this purpose, a new theoretical model incorporating Li diffusion, creep deformation, and induced stress is proposed. The results indicate that the diffusion-induced creep is an important mechanism for stress relaxation and capacity enhancement in Sn-based bilayer electrode. In addition, owing to the introduction of creep, the resultant stress should be dictated by the interplay between time scale associated with diffusion, applied flux and creep relaxations.
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