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

被引：64
作者：
Chong, Shaokun [1 ,2 ]
Ma, Meng [1 ,2 ]
Yuan, Lingling [1 ,2 ]
Qiao, Shuangyan [1 ,2 ]
Dong, Shihong [1 ,2 ]
Liu, Huakun [3 ]
Dou, Shixue [3 ]
机构：
[1] Northwestern Polytech Univ, Xian Inst Flexible Elect, Frontiers Sci Ctr Flexible Elect, Xian 710072, Peoples R China
[2] Northwestern Polytech Univ, Xian Inst Biomed Mat & Engn, Xian 710072, Peoples R China
[3] Univ Wollongong, Inst Superconducting & Elect Mat, Wollongong, NSW 2522, Australia
来源：
ENERGY & ENVIRONMENTAL MATERIALS | 2023年 / 6卷 / 06期
基金：
中国博士后科学基金;
关键词：
antimony selenide; conversion-alloying anode; N-doped carbon; potassium-ion batteries; sodium-ion batteries; ENERGY-STORAGE; CARBON; BATTERY; GRAPHENE;
D O I：
10.1002/eem2.12458
中图分类号：
T [工业技术];
学科分类号：
08 ;
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 sp(2) 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 sp(2) N sites and in situ form chemical bonding of C-N-Sb after initial discharge. Simulation results indicate that sp(2) N has more robust interaction with Sb and stronger adsorption capacities to Na+ and K+ than that of sp(3) 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.
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页数：11
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