Scalable One-Pot Synthesis of Hierarchical Bi@C Bulk with Superior Lithium-Ion Storage Performances.
作者:Xu, Xijun; Wang, Zhuosen; Zhang, Dechao; Zuo, Shiyong; Liu, Jun; Zhu, Min
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ACS applied materials & interfaces
卷:12 期:46 页:51478-51487
DOI:10.1021/acsami.0c14757
出版年: 2020-Nov-18 (Epub 2020 Nov 08)
文献类型:Journal Article
摘要
Lithium-ion batteries (LIBs), the most successful commercial energy storage devices, are now widespread in our daily life. However, the lack of appropriate electrode materials with long lifespan and superior rate capability is the urgent bottleneck for the development of high-performance LIBs. Herein, a hierarchical Bi@C bulk is developed via a scalable pyrolysis method. Due to the ultrafine size of Bi nanoparticles and in situ generated porous carbon framework, this Bi@C anode evidently facilitates the diffusion of Li+/electron, availably inhibits the agglomeration of active nano-Bi, and effectively mitigates the volume fluctuation. This hierarchical Bi@C bulk exhibits stable cycling performance for both LIBs (256 mAh g-1 at 1.0 A g-1 over 1400 cycles) and potassium-ion batteries (271 mAh g-1 at 0.1 A g-1 for 200 cycles). More importantly, when coupled with a commercial LiCoO2 cathode, the assembled LiCoO2//Bi@C cells provide an output voltage of 2.9 V and retain a capacity of 202 mAh g-1 at 0.15 A g-1. Moreover, kinetic analysis and in situ X-ray diffraction characterization reveal that the Bi@C anode displays a dominated pseudocapacitance behavior and a typical alloying storage mechanism during the cycling process.
关键词
关键词列表:Li-ion batteries; alloying storage mechanism; anode; hierarchical Bi@C bulk; long lifespan
作者信息
地址:Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials, School of Chemistry and Chemical Engineering and School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, P. R. China.