Precise tuning of low-crystalline Sb@Sb_(2)O_(3) confined in 3D porous carbon network for fast and stable potassium ion storage  

作　　者：Qun Ma Lida Song Yuan Wan Kangze Dong Zhiyuan Wang Dan Wang Hongyu Sun Shaohua Luo Yanguo Liu 

机构地区：[1]School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China [2]School of Resources and Materials,Northeastern University at Qinhuangdao,Qinhuangdao 066004,China [3]Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province,Qinhuangdao 066004,China

出　　处：《Journal of Materials Science & Technology》2021年第35期123-129,共7页材料科学技术（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.51871046,51902046,52071073,51771046,51971055);Natural Science Foundation of Hebei Province(No.E2019501097,E2018501091,E2020501004);The Science and Technology Project of Hebei Province(No.15271302D)。

摘　　要：Metal antimony(Sb)is a promising anode material of potassium-ion batteries(PIBs)for its high theoretical capacity but limited by its inferior cycle stability due to the serious volume expansion during cycling.Herein,we design and construct a kind of low-crystalline Sb nanoparticles coated with amorphous Sb2O3 and dispersed into three-dimensional porous carbon via a strategy involving NaCl template-assisted insitu pyrolysis and subsequent low-temperature heat-treated in air.Significantly,the crystallinity and ratio of Sb/Sb_(2)O_(3) have been precisely tuned and controlled,and the optimized sample of HTSb@Sb_(2)O_(3)@C-4 displays a high reversible specific capacity of 543.9 m Ah g^(-1) at 0.1 A g^(-1),superior rate capability and excellent cycle stability(~273 m Ah g^(-1) at 2 A g^(-1) after 2000 cycles)as an anode of PIBs.The outstanding potassium-ion storage performance can be ascribed to the appropriate crystallinity and the multiplebuffer-matrix structure comprising an interconnected porous conductive carbon to relieve the volume changes and suppress the aggregation of Sb,a Sb nanoparticle core to shorten the ion transport pathways and decrease the mechanical stress,and a low-crystalline Sb_(2)O_(3) as the shell to consolidate the interface between Sb and carbon as well as facilitate the rapid electron transport.The dynamic analysis shows that the composite is mainly controlled by pseudocapacitance mechanism.This work provides a novel thought to design high-performance composite electrode in energy storage devices.

关 键 词：Potassium-ion batteries ANODE Porous carbon ANTIMONY Antimony oxide 

分 类 号：TB333[一般工业技术—材料科学与工程] TM912[电气工程—电力电子与电力传动]