The fast and reversible sodiation/desodiation of anode materials remains an indelible yet fascinating target.Herein,a class of the densely packed Si/MXene composite microspheres is constructed and prepared,taking advan-tages of the synergistic effects of the activated Si nanoparticles and conductive flower-like MXene micro-spheres with ample ion-diffusion pathways.Consequently,the intrinsic MXene nanosheets with intelligently regulated interlayer spacing can accommodate the volume change induced strain during cycling,and the strong interaction between the Si and MXene matrix greatly contributes to the robust structural stability.As expected,the Si/MXene composite architecture exhibits boosted sodium storage performance,in terms of an inspiring reversible capacity of 751 mAh·g-1 at 0.1 A·g-1,remarkable long-term cycling stability of 376 mAh·g-1 at 0.1 A·g-1 over 500 cycles,and outstanding rate capability(after one consecutive current density changing from 0.1 to 2.0 A·g-1,a large capacity of 275 mAh·g-1 is regained after suddenly returning the ini-tial current density back to 0.1 A·g-1 and in the subsequent 200 cycles this composite architecture anode still delivers a capacity of 332 mAh·g-1).The kinetics analysis indicates superior pseudocapacitive property,high electronic con-ductivity,and favorable sodium-ion adsorption and diffu-sion capability,confirming fast sodium storage performance.Impressively,ex-situ X-ray diffraction and selected area electron diffraction characterizations corrob-orate the formation of NaSi6 as the main sodiation products during the reversible evolutions of cycled proceeding with sodium-ion insertion.This work sheds light on the elabo-rate design of silicon-based nanostructured anodes towards advanced high-performance sodium-ion batteries.

Hui-Qi Wang;Ya-Xin Zhao;Li Gou;Li-Yong Wang;Mei Wang;Ying Li;Sheng-Liang Hu

School of Energy and Power Engineering,North University of China,Taiyuan 030051,China;School of Materials Science and Engineering,North University of China,Taiyuan 030051,China

稀有金属（英文版）

[1]Hui-Qi Wang;Ya-Xin Zhao;Li Gou;Li-Yong Wang;Mei Wang;Ying Li;Sheng-Liang Hu-.Rational construction of densely packed Si/MXene composite microspheres enables favorable sodium storage)[J].稀有金属（英文版）,2022(05):1626-1636

corrob,orate,NaSi6

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