An amorphous LiO2-based Li-O2 battery with low overpotential and high rate capability

被引：78

作者：

Gao, Rui ^{[1
]}

Liang, Xiu ^{[2
]}

Yin, Penggang ^{[2
]}

Wang, Junkai ^{[1
]}

Lee, Yu Lin ^{[3
]}

Hu, Zhongbo ^{[1
]}

Liu, Xiangfeng ^{[1
]}

机构：

[1] Univ Chinese Acad Sci, Coll Mat Sci & Optoelect Technol, Beijing 100049, Peoples R China

[2] Beihang Univ, Sch Chem & Environm, Key Lab Bioinspired Smart Interfacial Sci & Techn, Minist Educ, Beijing, Peoples R China

[3] Imperial Coll London, Royal Sch Mines, Dept Mat, Exhibit Rd, London SW7 2AZ, England

来源：

NANO ENERGY | 2017年 / 41卷

基金：

中国国家自然科学基金;

关键词：

Li-O-2; battery; Amorphous LiO2; Catalyst; Palladium; Graphene; REDUCED GRAPHENE OXIDE; LITHIUM-AIR BATTERIES; LI-ION BATTERIES; CHARGE-TRANSPORT; SUPEROXIDE; OXYGEN; CATALYSTS; CATHODE; LI2O2; NANOPARTICLES;

D O I：

10.1016/j.nanoen.2017.10.013

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：

Replacing Li2O2 with LiO2 as the discharge product is a very promising strategy to tackle the problems of high overpotential(similar to 1.5 V), inferior rate capability and short cycle life in the current Li-O-2 batteries based on Li2O2. But it's very difficult to control LiO2 due to its thermodynamic instability. Herein, we have successfully built a facile rechargeable Li-O-2 battery based on the formation and decomposition of amorphous LiO2 with an ultralow overpotential(similar to 0.3 V), long cycle life and high rate capability under the catalysis of 3D-architectured Pd-rGO. In-situ Raman spectrum, linear sweep voltammetry, UV-vis measurements and SAED( Selected Area Electron Diffraction) all have identified the amorphous LiO2-based electrochemical process. Amorphous LiO2 shows a lower oxidation potential and a faster ionic conductivity contributing to the excellent electrochemical performances and the mitigation of undesirable side reactions. This study opens a new horizon to solve the intrinsic problems of the current Li-O-2 batteries.

引用

页码：535 / 542

页数：8

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