Hierarchical Encapsulation and Rich sp2 N Assist Sb2Se3-Based Conversion-Alloying Anode for Long-Life Sodium-and Potassium-Ion Storage

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外文摘要：Sodium-and potassium-ion batteries have exhibited great application potential in grid-scale energy storage due to the abundant natural resources of Na and K.Conversion-alloying anodes with high theoretical capacity and low-operating voltage are ideal option for SIBs and PIBs but suffer the tremendous volume variations.Herein,a hierarchically structural design and sp2 N-doping assist a conversion-alloying material,Sb2Se3,to achieve superior life span more than 1000 cycles.It is confirmed that the Sb2Se3 evolves into nano grains that absorb on the sp2 N sites and in situ form chemical bonding of C-N-Sb after initial discharge.Simulation results indicate that sp2 N has more robust interaction with Sb and stronger adsorption capacities to Na+and K+than that of sp3 N,which contributes to the durable cycling ability and high electrochemical activity,respectively.The ex situ transmission electron microscopy and X-ray photoelectron spectroscopy results suggest that the Sb2Se3 electrode experiences conversion-alloying dual mechanisms based on 12-electron transfer per formula unit.

外文关键词：

antimony selenideconversion-alloying anodeN-doped carbonpotassium-ion batteriessodium-ion batteries

作者：

Shaokun Chong、Meng Ma、Lingling Yuan、Shuangyan Qiao、Shihong Dong、Huakun Liu、Shixue Dou

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作者单位：

Frontiers Science Center for Flexible Electronics,Xi'an Institute of Flexible Electronics and Xi'an Institute of Biomedical Materials & Engineering,Northwestern Polytechnical University,Xi'an 710072,China

Institute for Superconducting and Electronic Materials,University of Wollongong,Wollongong NSW 2522,Australia

基金：

Natural Science Basic Research Program of ShaanxiGuangdong Basic and Applied Basic Research FoundationGuangdong Basic and Applied Basic Research Foundationproject funded by China Postdoctoral Science FoundationFundamental Research Funds for the Central Universities

项目编号：

2022JQ-1132021A15151101642022A15150102082021TQ0266G2020KY0534

出版年：

2023

DOI：

10.1002/eem2.12458

能源与环境材料(英文)

CSCD

ISSN：

年,卷(期)：2023.6(6)

参考文献量48