Synthesis of yolk-shell Bi_(2)O_(3)@TiO_(2) submicrospheres with enhanced potassium storage

作     者：Yifan Xu Hehe Zhang Tangjing Ding Ruiqi Tian Dongmei Sun Ming-Sheng Wang Xiaosi Zhou 

作者机构：Jiangsu Key Laboratory of New Power BatteriesJiangsu Collaborative Innovation Center of Biomedical Functional MaterialsSchool of Chemistry and Materials ScienceNanjing Normal UniversityNanjing 210023China State Key Lab of Physical Chemistry of Solid SurfacesCollege of MaterialsXiamen UniversityXiamen 361005China 

出 版 物：《Science China Chemistry》 (中国科学（化学英文版）)

年 卷 期：2022年第65卷第9期

页      面：1807-1816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）] 0702[理学-物理学] 

基　　金：supported by the Natural Science Foundation of Jiangsu Province of China(22179063 and 22072067) 

主　　题：Bi_(2)O_(3) amorphous TiO_(2) yolk-shell structure anode potassium-ion batteries 

摘      要：Due to their enormous potential for large-scale energy storage,rechargeable potassium-ion batteries have been widely researched and ***,the drastic volume change of electrode materials induced by the huge size of potassium ions during cycling remains a challenge for the construction of stable ***,we propose a novel weak acid etching strategy to design and fabricate robust yolk-shell spheres with enough internal void space,in which the Bi_(2)O_(3) nanospheres are well confined in the compartments of TiO_(2) submicrospheres(y-Bi_(2)O_(3)@TiO_(2)).In situ transmission electron microscopy(TEM)and ex situ Xray diffraction(XRD)are conducted to elucidate the structural evolution of y-Bi_(2)O_(3)@TiO_(2) and the interaction between K^(+)and Bi_(2)O_(3) during *** to the yolk-shell nanoarchitecture and the superior buffering property of outer TiO_(2) covering,the as-obtained composite shows a high specific capacity of 383.5 mAh g^(−1) at 100 mA g^(−1),a considerable rate capacity of 134.1 mAh g^(−1) at 2 A g^(−1) and a stable cycling performance of 216.8 mAh g^(−1) at 500 mA g^(−1) over 500 cycles when used for potassium ***,the potassium-ion full battery,constructed by pairing y-Bi_(2)O_(3)@TiO_(2) anode with the thermally annealed 3,4,9,10-perylenetetracarboxylic dianhydride(PTCDA)cathode,exhibits an outstanding cycling ***,this carefully-designed strategy can inspire the further development of superior energy storage materials in the near future.