纳米纤维
碳纤维
电化学
无机化学
X射线光电子能谱
纳米复合材料
碳纳米管
催化作用
钠离子电池
作者
Qingshan Zhao,Zhengzheng Xia,Tong Qian,Rong Xianchao,Mei Zhang,Yunfa Dong,Jinqing Chen,Hui Ning,Zhongtao Li,Han Hu,Mingbo Wu
出处
期刊:Carbon
[Elsevier]
日期:2021-04-15
卷期号:174: 325-334
被引量:4
标识
DOI:10.1016/j.carbon.2020.12.016
摘要
Abstract Transition metal oxides (TMOs) with high theoretical capacities are promising anode candidates for sodium ion batteries (SIBs), which yet suffers from inferior cycling stability and rate capability due to large volume change and sluggish transport kinetics during the sodiation/desodiation processes. Herein, a general strategy is developed to fabricate ultrafine TMOs nanoparticles encapsulated in nitrogen-doped carbon nanofibers (uf-TMOs@N-CNFs, M = Fe, Mn, Zn, etc.) as advanced anodes for SIBs. The uf-TMOs@N-CNFs are facilely synthesized via an in-situ electrospinning and subsequent carbonization strategy, among which polyvinylpyrrolidone (PVP) is employed as an effective dispersant to suppress metal agglomeration and control the size of TMOs. Benefiting from the intimate interaction between ultrafine TMOs and conductive N-CNFs substrates, the uf-TMOs@N-CNFs can efficiently mitigate the aggregation and pulverization of TMOs, facilitate electron/ion transfer, and boost pseudocapacitive charge storage, leading to superior sodium storage performance, including satisfactory reversible capacity, excellent rate capability, and durable cycling stability. Interestingly, the obtained uf-TMOs@N-CNFs membranes also exhibit excellent flexibility to serve as self-supported and flexible electrodes, demonstrating great potential for flexible SIBs. The present work provides a general and feasible method to construct robust and flexible electrodes for energy storage devices.
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