Electrochemical Oxidation of Li2O2 Surface-Doped with Li2CO3

Cui, Qinghua1; Zhang, Peng1,2; Wang, Jiawei1

2020

10.1021/acsami.9b19357

ACS Applied Materials and Interfaces   影响因子和分区

19448252

1944-8252

Electrochemical oxidation of Li2O2, i.e., the charging reaction of the aprotic lithium-oxygen batteries (Li-O2 batteries), is significantly influenced by its surface chemistry. Here, the surface species of Li2CO3, widely identified together with Li2O2 at the end of discharge, is investigated to understand its implication for the oxidation of Li2O2. In situ doping Li2O2 with various amounts of Li2CO3 has been obtained by reacting with CO2 gas in a controlled way, and the electrochemical oxidation of the doped Li2O2 is studied with a quantitative differential electrochemical mass spectrometer (DEMS). Instead of a single charging potential plateau and one O2 gas evolution stage for the pristine Li2O2, Li2CO3-doped Li2O2 exhibits two O2/CO2 gas evolution stages and three charging plateaus characterized with the larger overpotential for the initial and final stages. The conductivity of Li2CO3 dopant is invoked to explain the different oxidation behaviors of Li2CO3-doped Li2O2. The DEMS study of the electrochemical oxidation of isotope-labeled Li2¹³CO3 is also conducted to identify the origins of O2 and CO2 evolution during the oxidation of Li2CO3-doped Li2O2. The results reported here provide an improved understanding of the Li2O2 oxidation in the presence of parasitic Li2CO3 species and will contribute to the future development of Li-O2 batteries.
© 2020 American Chemical Society.

Li-O-2 batteries doped Li2O2 Li2O2 oxidation differential electrochemical mass spectrometer isotope labeling

SCI ; EI

英语

通讯

Newton Advanced Fellowships[NAF/R2/180603]

Science & Technology - Other Topics ; Materials Science

Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary

WOS:000512216900150

American Chemical Society

20200808201955

Carbon dioxide ; Charging (batteries) ; Electric discharges ; Electrochemical oxidation ; Isotopes ; Lithium-air batteries ; Mass spectrometers ; Surface chemistry ; Telecommunication industry

Electricity: Basic Concepts and Phenomena:701.1 ; Secondary Batteries:702.1.2 ; Physical Chemistry:801.4 ; Electrochemistry:801.4.1 ; Inorganic Compounds:804.2

Web of Science

1.State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin; 130022, China
2.Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen; 518055, China

Cui, Qinghua,Zhang, Peng,Wang, Jiawei. Electrochemical Oxidation of Li2O2 Surface-Doped with Li2CO3[J]. ACS Applied Materials and Interfaces,2020,12(5):6627-6632.

Cui, Qinghua,Zhang, Peng,&Wang, Jiawei.(2020).Electrochemical Oxidation of Li2O2 Surface-Doped with Li2CO3.ACS Applied Materials and Interfaces,12(5),6627-6632.

Cui, Qinghua,et al."Electrochemical Oxidation of Li2O2 Surface-Doped with Li2CO3".ACS Applied Materials and Interfaces 12.5(2020):6627-6632.