N-doped hollow carbon nanospheres as sulfur hosts for high performance Li-S batteries

被引：0

作者：

Zhang Yong-zheng ^{[1
]}

Ding Li-xin ^{[1
]}

Zhan Liang ^{[1
]}

Wang Yan-li ^{[1
]}

Song Yan ^{[2
]}

机构：

[1] East China Univ Sci & Technol, Shanghai Key Lab Multiphase Mat Chem Engn, Key Lab Specially Funct Polymers & Related Techno, State Key Lab Chem Engn,Minist Educ, Shanghai 200237, Peoples R China

[2] Chinese Acad Sci, Inst Coal Chem, CAS Key Lab Carbon Mat, Taiyuan 030001, Shanxi, Peoples R China

来源：

NEW CARBON MATERIALS | 2017年 / 32卷 / 04期

基金：

上海市自然科学基金; 中国国家自然科学基金;

关键词：

Hollow carbon sphere; Nitrogen doping; Lithium-sulfur battery; POROUS CARBON; LITHIUM; CHALLENGES; COMPOSITES; CATHODES; CAPACITY; GRAPHENE;

D O I：

10.1016/j.carbon.2017.08.048

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

SiO2@C nanospheres were fabricated by polymerization of dopamine in the presence of tetraethyl orthosilicate followed by carbonization and the SiO2 was chemically etched away to obtain hollow N-doped carbon nanospheres (N-CNs) to host sulfur. The resulting material (S@N-CNs) was used as the cathode material of a Li-S battery. Results indicate that the S@N-CNs can effectively suppress the volume expansion of sulfur and the shuttle effect of polysulfides during charge and discharge. Nitrogen doping improves the electrical conductivity of the N-CNs. The initial reversible capacity of the S@N-CN electrode at 0.2 C is 1 179 mAh.g(-1), which remains at 540 mAh.g(-1) after 100 cycles. The electrode has excellent rate capability (343 mAh . g(-1) at 1 C and 247 mAh . g(-1) at 2 C).

引用

页码：297 / 303

页数：7

共 21 条

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