Insight into Enhanced Cycling Performance of Li-O2 Batteries Based on Binary CoSe2/CoO Nanocomposite Electrodes

被引：51

作者：

Dong, Shanmu ^{[1
]}

Wang, Shan ^{[1
]}

Guan, Jing ^{[1
]}

Li, Shanming ^{[2
]}

Lan, Zhenggang ^{[1
]}

Chen, Chun ^{[3
]}

Shang, Chaoqun ^{[1
]}

Zhang, Lixue ^{[1
]}

Wang, Xiaogang ^{[1
]}

Gu, Lin ^{[2
]}

Cui, Guanglei ^{[1
]}

Chen, Liquan ^{[2
]}

机构：

[1] Chinese Acad Sci, Qingdao Inst Bioenergy & Bioproc Technol, Qingdao Key Lab Solar Energy Utilizat & Energy St, Qingdao 266101, Peoples R China

[2] Chinese Acad Sci, Inst Phys, Beijing 100090, Peoples R China

[3] Beijing Inst Technol, Dept Chem, Beijing 102488, Peoples R China

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2014年 / 5卷 / 03期

基金：

国家高技术研究发展计划(863计划); 中国国家自然科学基金;

关键词：

LITHIUM-AIR BATTERY; OXYGEN-REDUCTION; ALPHA-MNO2; NANORODS; IN-SITU; CATALYSTS; GRAPHENE; OXIDE; ELECTROCHEMISTRY; RECHARGEABILITY; NANOWIRES;

D O I：

10.1021/jz402755b

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, binary core-shell CoSe2/CoO nanocomposites are synthesized as cathodic electrodes for the Li-O-2 cell, which exhibits enhanced cycle performance. From theoretical calculations, aberration-corrected scanning transmission electron microscopy observation, and gas chromatography mass spectrum verification, we propose that an enhanced cycle performance can be attributed to the improvement of the compatibility of the cathode/Li2O2 interface, which results from preferable interaction between Li2O2 intermediates and the CoO "shell" and then reduction of interfacial Li2CO3 formation on the carbon surface. Furthermore, our findings demonstrate that the CoSe2 "core" may impact the electronic structure of surface metal ions, generating a superior cycling performance than that of pristine CoO materials. These results will offer some critical insights into the mechanistic process of Li-O-2 batteries.

引用

页码：615 / 621

页数：7

共 44 条

[1] A polymer electrolyte-based rechargeable lithium/oxygen battery [J].