A Highly Reversible Long-Life Li-CO2 Battery with a RuP2 -Based Catalytic Cathode

Ziyang Guo; Jinli Li; Haocheng Qi; Xuemei Sun; Hongdong Li; Andebet Gedamu Tamirat; Jie Liu; Yonggang Wang; Lei Wang

doi:10.1002/smll.201803246

A Highly Reversible Long-Life Li-CO₂ Battery with a RuP₂ -Based Catalytic Cathode

Small. 2019 Jul;15(29):e1803246. doi: 10.1002/smll.201803246. Epub 2018 Oct 21.

Authors

Ziyang Guo¹, Jinli Li¹, Haocheng Qi¹, Xuemei Sun¹, Hongdong Li¹, Andebet Gedamu Tamirat², Jie Liu¹, Yonggang Wang², Lei Wang¹

Affiliations

¹ Key Laboratory of Eco-Chemical Engineering, Taishan Scholar Advantage and Characteristic Discipline Team of Eco-Chemical Process and Technology, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, P. R. China.
² Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Institute of New Energy, Fudan University, Shanghai, 200433, P. R. China.

PMID: 30345634
DOI: 10.1002/smll.201803246

Abstract

Rechargeable Li-CO₂ batteries have attracted worldwide attention due to the capability of CO₂ capture and superhigh energy density. However, they still suffer from poor cycling performance and huge overpotential. Thus, it is essential to explore highly efficient catalysts to improve the electrochemical performance of Li-CO₂ batteries. Here, phytic acid (PA)-cross-linked ruthenium complexes and melamine are used as precursors to design and synthesize RuP₂ nanoparticles highly dispersed on N, P dual-doped carbon films (RuP₂ -NPCFs), and the obtained RuP₂ -NPCF is further applied as the catalytic cathode for Li-CO₂ batteries. RuP₂ nanoparticles that are uniformly deposited on the surface of NPCF show enhanced catalytic activity to decompose Li₂ CO₃ at low charge overpotential. In addition, the NPCF its with porous structure in RuP₂ -NPCF provides superior electrical conductivity, high electrochemical stability, and enough ion/electron and space for the reversible reaction in Li-CO₂ batteries. Hence, the RuP₂ -NPCF cathode delivers a superior reversible discharge capacity of 11951 mAh g^-1 , and achieves excellent cyclability for more than 200 cycles with low overpotentials (<1.3 V) at the fixed capacity of 1000 mAh g^-1 . This work paves a new way to design more effective catalysts for Li-CO₂ batteries.

Keywords: Li2CO3 decomposition; N, P-codoped carbon films; RuP2 nanoparticles; catalytic cathode; rechargeable Li-CO2 batteries.

Abstract

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