Pomegranate-inspired porous SnSe/ZnSe@C anode:A stress-buffer nanostructure for fast and ultrastable sodium-ion storage  

作　　者：Zhixin Liang Qinghua Li Wang Zhang Dandan Yu Wei Zhang Jiawei Wu Gaoyu Wang Wenbo Fan Junling Wang Shaoming Huang 

机构地区：[1]School of Materials and Energy,Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage Devices,Guangdong University of Technology,Guangzhou 510006,Guangdong,China [2]College of Materials Science and Engineering,Shenzhen University,Shenzhen 518055,Guangdong,China [3]College of Materials and Chemistry,China Jiliang University,Hangzhou 310018,Zhejiang,China

出　　处：《Journal of Energy Chemistry》2022年第12期369-377,I0010,共10页能源化学（英文版）

基　　金：support from the National Natural Science Foundation of China(51920105004,52102223);the Basic and Applied Basic Research Fund Project of Guangdong Province(2020A1515110401)。

摘　　要：Tin selenide(SnSe)is considered as a potential anode for sodium-ion batteries(SIBs)owing to its high theoretical specific capacity.Unfortunately,it suffers from drastic volume expansion/contraction during sodium ions insertion/extraction,resulting in poor cycling stability.Herein,a pomegranate-inspired porous carbon shell wrapped heterogeneous SnSe/ZnSe composite(SnSe/ZnSe@C)is exquisitely designed and fabricated through electrostatic spraying followed by high-temperature selenization.The polyacrylonitrile-derived carbon shell acts as an adhesive to link the porous cubic SnSe/ZnSe and form highly interconnected microcircuits to improve the electron/ion transfer efficiency and inhibit the bulk volume change of internal metallic selenide nanoparticles and polyselenides dissolution during repeated cycling.Moreover,the abundant heterostructure interface of SnSe/ZnSe further significantly accelerates the electrons/ions transport.As a result,the as-prepared SnSe/ZnSe@C electrode exhibits a high specific capacity(508.3 m Ah g^(-1)at 0.05 A g^(-1)),excellent rate performance(177.8 m Ah g^(-1)at 10.0 A g^(-1)),and remarkable cycling stability(195.9 m Ah g^(-1)after 10,000 cycles at 5.0 A g^(-1)).Furthermore,in-situ Xray diffraction(XRD)/Raman,ex-situ transmission electron microscopy,and kinetic analysis clearly reveal a four-step electrochemical reaction process and battery-capacitor dual-mode sodium storage mechanism.This work provides a new perspective for developing commercial SIBs anode materials with high capacity and long lifespan.

关 键 词：SnSe Electrostatic spraying Carbon armor Superior cycling stability Sodium-ion batteries Sodiation mechanism 

分 类 号：TM912[电气工程—电力电子与电力传动] TB332[一般工业技术—材料科学与工程]