Bismuth Telluride Nanoplates Hierarchically Confined by Graphene and N-Doped C as Conversion-Alloying Anode Materials for Potassium-Ion Batteries

被引:37
作者
Chong, Shaokun [1 ,2 ,3 ]
Yuan, Lingling [1 ,2 ]
Zhou, Qianwen [1 ,2 ]
Wang, Yikun [1 ,2 ]
Qiao, Shuangyan [1 ,2 ]
Li, Ting [1 ,2 ]
Ma, Meng [1 ,2 ]
Yuan, Bingyang [1 ,2 ]
Liu, Zhengqing [1 ,2 ]
机构
[1] Northwestern Polytech Univ, Xian Inst Flexible Elect, Frontiers Sci Ctr Flexible Elect, Xian 710072, Peoples R China
[2] Northwestern Polytech Univ, Xian Inst Biomed Mat & Engn, Xian 710072, Peoples R China
[3] Northwestern Polytech Univ Shenzhen, Res & Dev Inst, Shenzhen 518063, Peoples R China
基金
中国博士后科学基金; 中国国家自然科学基金;
关键词
anode materials; bismuth telluride; conversion-alloying mechanism; potassium-ion batteries; CARBON; NANOSHEETS; MECHANISM;
D O I
10.1002/smll.202303985
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Potassium-ion batteries (PIBs) have broad application prospects in the field of electric energy storage systems because of its abundant K reserves, and similar "rocking chair" operating principle as lithium-ion batteries (LIBs). Aiming to the large volume expansion and sluggish dynamic behavior of anode materials for storing large sized K-ion, bismuth telluride (Bi2Te3) nanoplates hierarchically encapsulated by reduced graphene oxide (rGO), and nitrogen-doped carbon (NC) are constructed as anodes for PIBs. The resultant Bi2Te3@rGO@NC architecture features robust chemical bond of BiOC, tightly physicochemical confinement effect, typical conductor property, and enhanced K-ion adsorption ability, thereby producing superior electrochemical kinetics and outstanding morphological and structural stability. It is visually elucidated via high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) that conversion-alloying dual-mechanism plays a significant role in K-ion storage, allowing 12 K-ion transport per formular unit employing Bi as redox site. Thus, the high first reversible specific capacity of 322.70 mAh g(-1) at 50 mA g(-1), great rate capability and cyclic stability can be achieved for Bi2Te3@rGO@NC. This work lays the foundation for an in-depth understanding of conversion-alloying mechanism in potassium-ion storage.
引用
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页数:10
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