journal article·2021-10-08

Breaking the Stable Triangle of Carbonate via W–O Bonds for Li-CO2 Batteries with Low Polarization

Xuejing Zhang, Tianshuai Wang, Yijun Yang, Xin Zhang, Zongjing Lu, Jingnan Wang, Chao Sun, Yanyan Diao, Xi Wang, Jiannian Yao

ACS Energy Letters· Volume 6· Issue 10
Publisher page

Abstract

Li-CO2 batteries are widely studied as a promising technology for greenhouse-gas CO2 fixation as well as for energy conversion and storage devices. Their further development, however, is hindered by the refractory discharge products, leading to large polarization voltage and low round-trip efficiency. Here, W2C nanoparticles embedded in the walls of carbon nanotubes (W2C-CNTs) are prepared successfully. An efficient Li-CO2 battery with a W2C-CNTs cathode displays ultralow charge voltage (3.2 V) and high round-trip efficiency (90.1%). The low polarization comes from electron-rich W atoms that break the stable triangle of CO32– via W–O bonds. The resulting amorphous discharge products could be readily and reversibly decomposed during charging. Raman and XAS spectra provide direct and solid evidence for the W–O bonds. Also, DFT calculations show there is electron transfer between the W2C surface and Li2CO3, resulting in a low decomposition barrier for Li2CO3 on the W2C substrate.
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Research context

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

School of Chemical Engineering and Technology, Molecular Plus and Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin 300072, China

Institute of Molecular Plus, Tianjin University, Tianjin 300072, China

Department of Physics, School of Science, Beijing Jiaotong University, Beijing 100044, China

Beijing Key Laboratory of Ionic Liquids Clean Process, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China

Key Laboratory of Photochemistry, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China

Funding

China Petrochemical Corporation · Central University Basic Research Fund of China · National Natural Science Foundation of China · National Science and Technology Major Project · Science and Technology Project of Guangdong Province · Chemistry and Chemical Engineering Guangdong Laboratory

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