Constructing oxygen-deficient V_(2)O_(3)@C nanospheres for high performance potassium ion batteries

作     者：Qiang Deng Luolan Wang Jing Li Qian Cheng Xiaozhao Liu Changdong Chen Qimeng Zhang Wentao Zhong Hua Wang Lijue Wu Chenghao Yang Qiang Deng;Luolan Wang;Jing Li;Qian Cheng;Xiaozhao Liu;Changdong Chen;Qimeng Zhang;Wentao Zhong;Hua Wang;Lijue Wu;Chenghao Yang

作者机构：Guangzhou Key Laboratory for Surface Chemistry of Energy MaterialsNew Energy Research InstituteSchool of Environment and EnergySouth China University of TechnologyGuangzhou 510006China Guangdong Jiana Energy Technology Co.Ltd.Qingtang TownYingde 513056China 

出 版 物：《Chinese Chemical Letters》 (中国化学快报（英文版）)

年 卷 期：2023年第34卷第3期

页      面：507-511页

核心收录：

学科分类：0808[工学-电气工程] 07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学] 

基　　金：financial support from the National Natural Science Foundation of China(Nos.51922042 and 51872098) Fundamental Research Funds for Central Universities,China(No.2020ZYGXZR074) the Scientific and Technological Plan of Qingyuan City,China(2019DZX008) 

主　　题：V_(2)O_(3)@C Nanospheres Oxygen deficiency Potassium ion batteries Anode 

摘      要：Potassium ion batteries(PIBs) have been regarded as promising alternatives to lithium ion batteries(LIBs)on account of their abundant resource and low cost in large scale energy storage applications. However,it still remains great challenges to explore suitable electrode materials that can reversibly accommodate large size of potassium ions. Here, we construct oxygen-deficient V_(2)O_(3)nanoparticles encapsulated in amorphous carbon shell(Od-V_(2)O_(3)@C) as anode materials for PIBs by subtly combining the strategies of morphology and deficiency engineering. The MOF derived nanostructure along with uniform carbon coating layer can not only enables fast K+migration and charge transfer kinetics, but also accommodate volume change and maintain structural stability. Besides, the introduction of oxygen deficiency intrinsically tunes the electronic structure of materials according to DFT calculation, and thus lead to improved electrochemical performance. When utilized as anode for PIBs, Od-V_(2)O_(3)@C electrode exhibits superior rate capability(reversible capacities of 262.8, 227.8, 201.5, 179.8, 156.9 mAh/g at 100, 200, 500, 1000 and2000 mA/g, respectively), and ultralong cycle life(127.4 mAh/g after 1000 cycles at 2 A/g). This study demonstrates a feasible way to realize high performance PIBs through morphology and deficiency engineering.