SnS2/Co3S4 Hollow Nanocubes Anchored on S-Doped Graphene for Ultrafast and Stable Na-Ion Storage

被引:78
作者
Wu, Ya-Qian [1 ,2 ]
Yang, Hui-Xian [1 ,2 ]
Yang, Yu [1 ,2 ]
Pu, Hao [1 ,2 ]
Meng, Wen-Jie [1 ,2 ]
Gao, Rui-Ze [1 ,2 ]
Zhao, Dong-Lin [1 ,2 ]
机构
[1] Beijing Univ Chem Technol, State Key Lab Chem Resource Engn, Beijing 100029, Peoples R China
[2] Beijing Univ Chem Technol, Minist Educ, Key Lab Carbon Fiber & Funct Polymers, Beijing 100029, Peoples R China
基金
国家教育部博士点专项基金资助; 中国国家自然科学基金;
关键词
hollow nanocubes; S-doped graphene; SnS2; Co3S4; sodium-ion batteries; BATTERY ANODE; HIGH-CAPACITY; LITHIUM-ION; CYCLE LIFE; SODIUM; OXIDE; SNS2; NANOPARTICLES; NANOSHEETS; COMPOSITE;
D O I
10.1002/smll.201903873
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
SnS2 has been widely studied as an anode material for sodium-ion batteries (SIBs) based on the high theoretical capacity and layered structure. Unfortunately, rapid capacity decay associated with volume variation during cycling limits practical application. Herein, SnS2/Co3S4 hollow nanocubes anchored on S-doped graphene are synthesized for the first time via coprecipitation and hydrothermal methods. When applied as the anode for SIBs, the sample delivers a distinguished charge specific capacity of 1141.8 mAh g(-1) and there is no significant capacity decay (0.1 A g(-1) for 50 cycles). When the rate is increased to 0.5 A g(-1), it presents 845.7 mAh g(-1) after cycling 100 times. Furthermore, the composite also exhibits an ultrafast sodium storage capability where 392.9 mAh g(-1) can be obtained at 10 A g(-1) and the charging time is less than 3 min. The outstanding electrochemical properties can be ascribed to the enhancement of conductivity for the addition of S-doped graphene and the existence of p-n junctions in the SnS2/Co3S4 heterostructure. Moreover, the presence of mesopores between nanosheets can alleviate volume expansion during cycling as well as being beneficial for the migration of Na+.
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页数:9
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