DataVXACS Applied Materials & InterfacesPaper
journal article·2020-01-29

Potassium Doping Facilitated Formation of Tunable Superoxides in Li2O2 for Improved Electrochemical Kinetics

Wenrui Dai, Xinhang Cui, Xiao Chi, Yin Zhou, Jinlin Yang, Xu Lian, Qi Zhang, Wenhao Dong, Wei Chen

ACS Applied Materials & Interfaces· Volume 12· Issue 4
Publisher page
Source abstract

Abstract

Superoxide (O2–) species play a crucial role in determining the charge kinetics for aprotic lithium–oxygen (Li–O2) batteries. However, the growth of O2–-rich lithium peroxide (Li2O2) is challenging since O2– is thermodynamically unfavorable and unstable in an O2 atmosphere. Herein, we reported the synthesis of defective Li2O2 with tunable O2– via K+ doping. The K+ dopants can successfully stabilize O2– species and induce the coordination of Li+ with O2–, leading to increased Li vacancies. Compared to the pristine Li2O2, the as-prepared defective Li2O2 can be charged at a lower overpotential in Li–O2 batteries, which is ascribed to further increased Li vacancies contributed by the depotassiation process at the onset of the charge process. Our findings suggest a new strategy to better control O2– species in Li2O2 by K+ dopants and provide insights into the K+ effects on charge mechanism in Li–O2 batteries.
Source: openalex_inverted_index · Quality: baseline

Research context

Energy storage

OpenAlex topics: Advancements in Battery Materials · Advanced Battery Materials and Technologies · Advanced Battery Technologies Research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Advanced Energy Storage Materials and Devices Lab, School of Physics and Electronic-Electrical Engineering, Ningxia University, Yinchuan 750021, P. R. China

Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543 Singapore

National University of Singapore (Suzhou) Research Institute, 377 Lin Quan Street, Suzhou Industrial Park, Suzhou, Jiangsu 215123, P. R. China

Department of Physics, National University of Singapore, 2 Science Drive 3, 117542 Singapore

Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, 117603 Singapore

Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Binhai New City, Fuzhou 350207, P. R. China

Funding

Ministry of Education - Singapore · General Project of Key R&D Program of Ningxia Hui Autonomous Region

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