Ultra-thick,dense dual-encapsulated Sb anode architecture with conductively elastic networks promises potassium-ion batteries with high areal and volumetric capacities

查看全文 作　　者：Zhonggang [1]Liu;Xi [1]Liu;Bingchun [1]Wang;Xinying [1]Wang;Dongzhen [1]Lu;Dijun [1]Shen;Zhefei [2]Sun;Yongchang [3]Liu;Wenli [4]Zhang;Qiaobao [2]Zhang;Yunyong [1]Li

机构地区：[1]School of Materials and Energy,Guangdong University of Technology,No.100 Waihuan Xi Road,Guangzhou Higher Education Mega Center,Guangzhou 510006,China;[2]State Key Laboratory of Physical Chemistry of Solid Surfaces,College of Materials,Xiamen University,Xiamen,Fujian 361005,China;[3]Beijing Advanced Innovation Center for Materials Genome Engineering,Institute for Advanced Materials and Technology,State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China;[4]Guangdong Provincial Key Laboratory of Plant Resources Biorefinery,School of Chemical Engineering and Light Industry,Guangdong University of Technology,No.100 Waihuan Xi Road,Guangzhou Higher Education Mega Center,Guangzhou 510006,China

出　　处：《eScience》索引2023年第3卷第6期,共11页

基　　金：supported by the National Natural Science Foundation of China (Nos.51972066,52122211,52072323);the Natural Science Foundation of Guangdong Province of China (No.2021A1515011718);the Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme (2017);Nanqiang Young Top-notch Talent Fellowship in Xiamen University. 摘　　要：Ultra-thick,dense alloy-type anodes are promising for achieving large areal and volumetric performance in potassium-ion batteries(PIBs),but severe volume expansion as well as sluggish ion and electron diffusion kinetics heavily impede their widespread application.Herein,we design highly dense(3.1 g cm^(-3))Ti_(3)C_(2)T_(x) MXene and graphene dual-encapsulated nano-Sb monolith architectures(HD-Sb@Ti_(3)C_(2)T_(x)-G)with high-conductivity elastic networks(1560 S m^(-1))and compact dually encapsulated structures,which exhibit a large volumetric capacity of 1780.2 mAh cm^(-3)(gravimetric capacity:565.0 mAh g^(-1)),a long-term stable lifespan of 500 cycles with 82%retention,and a large areal capacity of 8.6 mAh cm^(-2)(loading:31 mg cm^(-2))in PIBs.Using ex-situ SEM,in-situ TEM,kinetic investigations,and theoretical calculations,we reveal that the excellent areal and volumetric performance mechanism stems from the three dimensional(3D)high-conductivity elastic networks and the dualencapsulated Sb architecture of Ti_(3)C_(2)T_(x) and graphene;these effectively mitigate against volume expansion and the pulverization of Sb,offering good electrolyte penetration and rapid ionic/electronic transmission.Ti_(3)C_(2)T_(x) also decreases the Kþdiffusion energy barrier,and the ultra-thick compact electrode ensures volumetric and areal performance.These findings provide a feasible strategy for fabricating ultra-thick,dense alloy-type electrodes to achieve high areal and volumetric capacity energy storage via highly-dense,dual-encapsulated architectures with conductive elastic networks. 关键词：ANTIMONY Dually encapsulated structure Compact monolith Areal capacity Volumetric capacity Potassium-ion batteries

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Ultra-thick,dense dual-encapsulated Sb anode architecture with conductively elastic networks promises potassium-ion batteries with high areal and volumetric capacities

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