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Coating‐Mediated Nanomechanical Behaviors of CuO Electrodes in Li‐ and Na‐Ion Batteries
Advanced Materials Interfaces ( IF 5.4 ) Pub Date : 2020-09-09 , DOI: 10.1002/admi.202001161
Shuaishuai Hu 1 , Huihui Liu 1 , He Zheng 1, 2, 3 , Shuangfeng Jia 1 , Guoxujia Chen 1 , Renhui Jiang 1 , Lei Li 1 , Ligong Zhao 1 , Dongshan Zhao 1 , Jianbo Wang 1
Affiliation  

Surface coating strategy has been proved essential for mitigating the large volume change in the electrodes for lithium‐ion batteries (LIBs) and sodium‐ion batteries (SIBs), thus improving the cyclability and working efficiency of batteries. However, the mechanical instability of electrode generated by incorporating heterostructure interface between the coating and core materials remains largely unexplored. Here, the effects of carbon and gold coatings on the nanomechanical properties of CuO nanowires (NWs) are investigated based on the in situ experiments during the electrochemical reactions. It is found that the NW deformability is mediated by the coating materials as well as the reaction speed. Besides, the inhomogeneity between coating and core materials can promote the crack propagation in the lithiated/sodiated CuO/C NWs and sodiated CuO/Au NWs. Further study indicates that the namomechanical behaviors also depend on the different reaction stages, e.g., lithiation/sodiation or delithiation/desodiation. This work serves as a guidance for building better ion batteries not only with improved electrochemical properties but enhanced mechanical stabilities.

中文翻译:

锂和钠离子电池中涂层介导的CuO电极的纳米力学行为

事实证明,表面涂层策略对于缓解锂离子电池(LIB)和钠离子电池(SIB)的电极中的大体积变化至关重要,从而改善了电池的可循环性和工作效率。然而,通过在涂层和芯材之间掺入异质结构界面而产生的电极的机械不稳定性在很大程度上尚待探索。在此,基于电化学反应过程中的原位实验,研究了碳和金涂层对CuO纳米线(NWs)纳米机械性能的影响。发现NW变形能力是由涂层材料以及反应速度介导的。除了,涂层和芯材之间的不均匀性可促进裂纹在锂化/钠化的CuO / C NW和钠化的CuO / Au的NW中传播。进一步的研究表明,纳米机械行为还取决于不同的反应阶段,例如,锂化/沉降或脱锂/脱沉降。这项工作为构建更好的离子电池提供了指导,不仅具有改善的电化学性能,而且具有增强的机械稳定性。
更新日期:2020-11-06
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