High Sulfur-Doped Hard Carbon with Advanced Potassium Storage Capacity via a Molten Salt Method

被引：77

作者：

Zhang, Yu ^{[1
]}

Li, Lin ^{[1
]}

Xiang, Yinger ^{[1
]}

Zou, Guoqiang ^{[1
]}

Hou, Hongshuai ^{[1
]}

Deng, Wentao ^{[1
]}

Ji, Xiaobo ^{[1
,2
]}

机构：

[1] Cent South Univ, Coll Chem & Chem Engn, Changsha 410083, Peoples R China

[2] Jiangxi Univ Sci & Technol, Sch Met & Chem Engn, Ganzhou 341000, Peoples R China

来源：

ACS APPLIED MATERIALS & INTERFACES | 2020年 / 12卷 / 27期

基金：

中国国家自然科学基金;

关键词：

molten salt method; hard carbon; sulfur doping; anode material; potassium-ion batteries; ION BATTERIES; PERFORMANCE; FRAMEWORKS; ANODE;

D O I：

10.1021/acsami.0c07616

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Owing to the slight volume expansion after potassiation, hard carbon is regarded as a promising anode material for potassium-ion batteries (PIBs). Heteroatom doping (such as sulfur or nitrogen) is a common method to modify hard carbon for high K-storage capacity and long cycling performance. High sulfur-doped hard carbon with a sulfur content of 25.8 wt % is prepared by calcining glucose in molten salt (K2SO4@LiCl/KCl). It exhibits high specific capacities of 361.4 mA h g(-1) during the 1st cycle and 317.7 mA h g(-1) during the 100th cycle at 0.05 A g(-1). The high capacity arises from the K-S reaction behavior, which is demonstrated by the cyclic voltammetry test and galvanostatic intermittent titration technique. This work is an effective application of the molten salt method for PIBs, furnishing an understanding to K-storage behaviors of hard carbon- with high sulfur content.

引用

页码：30431 / 30437

页数：7