Mechanistic Insights into the Structural Modulation of Transition Metal Selenides to Boost Potassium Ion Storage Stability
Mechanistic Insights into the Structural Modulation of Transition Metal Selenides to Boost Potassium Ion Storage Stability
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DOI：
10.1021/acsnano.1c04493
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发表时间：
2021-09-10
期刊：
影响因子：
17.1
通讯作者：
Xu, Zhiwei
中科院分区：
文献类型：
--
作者：
Liang, Shuaitong;Yu, Zhenjiang;Xu, Zhiwei
原子级结构工程是一种有效策略，可减少电池负极的机械性能衰退并提升离子传输动力学。为解决因K⁺离子半径较大而导致的电极失效问题，我们在此合成了具有调控电子结构的锰掺杂硒化锌，用于钾离子电池（PIBs）。我们运用了最先进的分析技术和理论计算，以探究晶体结构变化、离子/电子迁移路径以及微机械应力演变机制。我们证明，电子结构的非均相调控能够缓解钾化过程引发的内部应变，提高电池负极的结构稳定性。我们的工作凸显了掺杂化学与机械稳定性之间关联的重要性，为实现高稳定性钾离子电池的结构工程策略开辟了一条途径。
Atomic-level structure engineering is an effective strategy to reduce mechanical degradation and boost ion transport kinetics for battery anodes. To address the electrode failure induced by large ionic radius of K+ ions, herein we synthesized Mn-doped ZnSe with modulated electronic structure for potassium ion batteries (PIBs). State-of-the-art analytical techniques and theoretical calculations were conducted to probe crystalline structure changes, ion/electron migration pathways, and micromechanical stresses evolution mechanisms. We demonstrate that the heterogeneous adjustment of the electronic structure can relieve the potassiumization-induced internal strain and improve the structural stability of battery anodes. Our work highlights the importance of the correlation between doping chemistry and mechanical stability, inspiring a pathway of structural engineering strategy toward a highly stable PIBs.