材料科学
铋
微球
氮气
碳纤维
钠
离子
兴奋剂
化学工程
无机化学
纳米技术
冶金
光电子学
复合材料
复合数
有机化学
化学
工程类
作者
Zhilin Chen,Xiaoyu Wu,Zhefei Sun,Jianhai Pan,Jiajia Han,Yangsu Wang,Haodong Liu,Yanbin Shen,Ziyang Wang,Dong‐Liang Peng,Qiaobao Zhang
标识
DOI:10.1002/aenm.202400132
摘要
Abstract Micro‐sized bismuth (Bi) is recognized for its high volumetric capacity and suitable working potential, making it a promising anode candidate for sodium‐ion batteries (SIBs). However, its substantial volume changes and slow reaction kinetics during cycling detrimentally affects the SIB performance. Theoretical prediction uncovers a previously unexplored favorable attribute that bonding between nitrogen within a carbon coating and Bi atoms facilitates Na + ingress into the Bi bulk, significantly enhancing Bi‐Na alloying reactions, mitigating volume expansion, and preventing Na‐dendrite formation. Experimentally, the study innovatively engineers a flower‐like micro‐sized Bi encapsulated within an elastic, nitrogen‐doped carbon framework (FBi@NC) working as an efficient anode for SIBs. This design enables FBi@NC anode achieving a high tap density of 2.86 g cm −3 and delivering a remarkable volumetric capacity of 1100 mAh cm −3 at 1 mA cm − 2 . It also exhibits exceptional rate capability (368.2 mA h g −1 at 30 A g −1 ) and super durable cyclability (10 000 cycles with 318.8 mA h g −1 at 5 A g −1 , retaining 82% capacity). Full cells with Na 3 V 2 (PO 4 ) 3 cathodes demonstrate superior rate and cycling performances. Crucially, this study elucidates the underlying Na + ‐storage mechanisms and the contributory factors to performance enhancement, providing vital insights for the development of high‐energy and stable SIBs.
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