Precise tuning of low-crystalline Sb@Sb2O3 confined in 3D porous carbon network for fast and stable potassium ion storage

Qun Ma ¹Lida Song ¹Yuan Wan ¹Kangze Dong ¹Zhiyuan Wang ²Dan Wang ²Hongyu Sun ²Shaohua Luo ²Yanguo Liu²

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作者信息

1. School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China
2. School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China;School of Resources and Materials,Northeastern University at Qinhuangdao,Qinhuangdao 066004,China;Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province,Qinhuangdao 066004,China
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Abstract

Metal antimony (Sb) is a promising anode material of potassium-ion batteries (PIBs) for its high theoreti-cal 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 in-situ pyrolysis and subsequent low-temperature heat-treated in air.Significantly,the crystallinity and ratio of Sb/Sb2O3 have been precisely tuned and controlled,and the optimized sample of HTSb@Sb2O3@C-4 displays a high reversible specific capacity of 543.9 mAh g-1 at 03 A g-1,superior rate capability and excellent cycle stability (～273 mAh 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 multiple-buffer-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 path-ways and decrease the mechanical stress,and a low-crystalline Sb2O3 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.

Key words

Potassium-ion batteries/Anode/Porous carbon/Antimony/Antimony oxide

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基金项目

National Natural Science Foundation of China(51871046)

National Natural Science Foundation of China(51902046)

National Natural Science Foundation of China(52071073)

National Natural Science Foundation of China(51771046)

National Natural Science Foundation of China(51971055)

Natural Science Foundation of Hebei Province(E2019501097)

Natural Science Foundation of Hebei Province(E2018501091)

Natural Science Foundation of Hebei Province(E2020501004)

Science and Technology Project of Hebei Province(15271302D)

出版年

2021

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCDSCI

影响因子：0.657

ISSN：1005-0302

参考文献量49

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