Tailoring interactions of carbon and sulfur in Li-S battery cathodes: significant effects of carbon-heteroatom bonds

被引：77

作者：

Li, Xia ^{[1
]}

Li, Xifei ^{[1
]}

Banis, Mohammad N. ^{[1
]}

Wang, Biqiong ^{[1
,2
]}

Lushington, Andrew ^{[1
]}

Cui, Xiaoyu ^{[3
]}

Li, Ruying ^{[1
]}

Sham, Tsun-Kong ^{[2
]}

Sun, Xueliang ^{[1
]}

机构：

[1] Univ Western Ontario, Dept Mech & Mat Engn, London, ON N6A 5B9, Canada

[2] Univ Western Ontario, Dept Chem, London, ON N6A 5B7, Canada

[3] Canadian Light Source, Saskatoon, SK S7N 2V3, Canada

来源：

JOURNAL OF MATERIALS CHEMISTRY A | 2014年 / 2卷 / 32期

基金：

加拿大自然科学与工程研究理事会;

关键词：

HEAT-TREATMENT AFFECT; HIGH-ENERGY DENSITY; NONNOBLE ELECTROCATALYSTS; O-2; REDUCTION; LITHIUM; GRAPHENE; CAPACITY; RAMAN; ELECTROLYTE; CHALLENGES;

D O I：

10.1039/c4ta02007c

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In this study, effects of carbon-heteroatom bonds on sulfur cathodes were investigated. A series of carbon black substrates were prepared using various treatments to introduce nitrogen or oxygen surface species. Our results indicated that nitrogen-doped carbon black significantly improved the electrochemical performance of sulfur cathode materials. Synchrotron-based XPS revealed that the defect sites of nitrogen-doped carbon are favorable for the discharge product deposition, leading to a high utilization and reversibility of sulfur cathodes. Our studies also found that the introduction of oxygen functional groups results in deteriorated performance of Li-sulfur batteries due to the reduced conductivity and unwanted side reactions occurring between sulfur and surface oxygen species.

引用

页码：12866 / 12872

页数：7

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