Nanoconfined Oxidation Synthesis of N-Doped Carbon Hollow Spheres and MnO2 Encapsulated Sulfur Cathode for Superior Li-S Batteries

被引：41

作者：

Shen, Jiadong ^{[1
,2
,3
]}

Liu, Jun ^{[1
,2
,3
]}

Liu, Zhengbo ^{[1
,2
,3
]}

Hu, Renzong ^{[1
,2
,3
]}

Liu, Jiangwen ^{[1
,2
,3
]}

Zhu, Min ^{[1
,2
,3
]}

机构：

[1] South China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510641, Guangdong, Peoples R China

[2] South China Univ Technol, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510641, Guangdong, Peoples R China

[3] South China Univ Technol, SUNWODA SCUT Joint Lab Adv Energy Storage Technol, Guangzhou 510641, Guangdong, Peoples R China

来源：

CHEMISTRY-A EUROPEAN JOURNAL | 2018年 / 24卷 / 18期

基金：

中国国家自然科学基金;

关键词：

cathode material; encapsulating structure; Li-S batteries; N-doped carbon; nanoconfined oxidation; HIGH-CAPACITY; POLYSULFIDE MEDIATOR; GRAPHENE OXIDE; POROUS CARBON; LITHIUM; SHELL; NANOSHEETS; NANOTUBES; SULFIDE;

D O I：

10.1002/chem.201704590

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The sulfur cathode, as a new generation of lithium-ion battery cathode material, has a high theoretical energy density of about 2500Whkg(-1). However, the low conductivity of sulfur and the shuttle effect, widely presenting in the lithiation/de-lithiation process, seriously hinder its practical application. Here, we report a new nanoconfined oxidation route (first complete oxidation of metal sulfide and subsequently partial oxidation of the generated S from sulfide) for S cathode encapsulated with MnO2 nanosheets and N-doped carbon hollow spheres. This nanoconfined oxidation route can successfully confine the sulfur particles in the interior of the carbon shell, and the rationally introduced nonpolar carbon and polar MnO2 can both reduce the dissolution of polysulfide during the charge-discharge process. The obtained well-defined S-MnO2@C cathode exhibits high specific capacity with excellent cycling performance and superior rate capability.

引用

页码：4573 / 4582

页数：10

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