Quantifying the reaction mechanisms of a high-capacity CuP2/C composite anode for potassium ion batteries
Abstract
Introducing metals into phosphorus to form metal phosphide materials as anodes for potassium ion batteries (PIBs) is an effective strategy to improve the electronic conductivity and alleviate the volume change during cycling, although with a compromise of capacity. Here in this paper, we explore a CuP2/C composite as a novel anode for PIBs, which delivers a high reversible capacity of >450 mA h g-1. Unexpectedly, our results reveal that the POx components existing in the prepared composite are reversible, through a quantitative analysis via high-resolution solid-state 31P NMR and synchrotron X-ray diffraction tests. Their potassiation products K3PO4 and K4P2O7 can react with K–P alloys and turn back to POx during depotassiation, which probably accounts for the high capacity of the prepared material. The results also illustrate a crystallization–amorphization evolution process during cycling involving nanocrystalline α-K4P6, K4P3 and KP, and amorphous K4P6, KP and K3P phases, among which, the amorphous phases are identified for the first time.
- Authors:
-
[2];
[5];
[3];
[6];
[6];
[5]
- Fuzhou University, Fuzhou, Fujian (China); Chinese Academy of Sciences (CAS), Fuzhou, Fujian (China); Chinese Academy of Sciences (CAS), Xiamen, Fujian (China)
- Chinese Academy of Sciences (CAS), Fuzhou, Fujian (China); Chinese Academy of Sciences (CAS), Xiamen, Fujian (China)
- Univ. of California, San Diego, CA (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Xiamen University, Xiamen, Fujian (China)
- Fuzhou University, Fuzhou, Fujian (China); Chinese Academy of Sciences (CAS), Fuzhou, Fujian (China); Chinese Academy of Sciences (CAS), Xiamen, Fujian (China); University of Chinese Academy of Sciences, Beijing (China)
- Publication Date:
- Research Org.:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- National Natural Science Foundation of China (NSFC); Chinese Academy of Sciences (CAS); Natural Science Foundation of Fujian Province
- OSTI Identifier:
- 1840688
- Grant/Contract Number:
- AC02-06CH11357
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Materials Chemistry. A
- Additional Journal Information:
- Journal Volume: 9; Journal Issue: 10; Journal ID: ISSN 2050-7488
- Publisher:
- Royal Society of Chemistry
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 25 ENERGY STORAGE; Anode; CuP2; Solid-state NMR
Citation Formats
Zhao, Chen, Chen, Huixin, Liu, Haodong, Yin, Liang, Zhang, Qiaobao, Yu, Sicen, Liu, Ping, Zhong, Guiming, Lu, Can-Zhong, and Yang, Yong. Quantifying the reaction mechanisms of a high-capacity CuP2/C composite anode for potassium ion batteries. United States: N. p., 2021.
Web. doi:10.1039/d0ta12141j.
Zhao, Chen, Chen, Huixin, Liu, Haodong, Yin, Liang, Zhang, Qiaobao, Yu, Sicen, Liu, Ping, Zhong, Guiming, Lu, Can-Zhong, & Yang, Yong. Quantifying the reaction mechanisms of a high-capacity CuP2/C composite anode for potassium ion batteries. United States. https://doi.org/10.1039/d0ta12141j
Zhao, Chen, Chen, Huixin, Liu, Haodong, Yin, Liang, Zhang, Qiaobao, Yu, Sicen, Liu, Ping, Zhong, Guiming, Lu, Can-Zhong, and Yang, Yong. Tue .
"Quantifying the reaction mechanisms of a high-capacity CuP2/C composite anode for potassium ion batteries". United States. https://doi.org/10.1039/d0ta12141j. https://www.osti.gov/servlets/purl/1840688.
@article{osti_1840688,
title = {Quantifying the reaction mechanisms of a high-capacity CuP2/C composite anode for potassium ion batteries},
author = {Zhao, Chen and Chen, Huixin and Liu, Haodong and Yin, Liang and Zhang, Qiaobao and Yu, Sicen and Liu, Ping and Zhong, Guiming and Lu, Can-Zhong and Yang, Yong},
abstractNote = {Introducing metals into phosphorus to form metal phosphide materials as anodes for potassium ion batteries (PIBs) is an effective strategy to improve the electronic conductivity and alleviate the volume change during cycling, although with a compromise of capacity. Here in this paper, we explore a CuP2/C composite as a novel anode for PIBs, which delivers a high reversible capacity of >450 mA h g-1. Unexpectedly, our results reveal that the POx components existing in the prepared composite are reversible, through a quantitative analysis via high-resolution solid-state 31P NMR and synchrotron X-ray diffraction tests. Their potassiation products K3PO4 and K4P2O7 can react with K–P alloys and turn back to POx during depotassiation, which probably accounts for the high capacity of the prepared material. The results also illustrate a crystallization–amorphization evolution process during cycling involving nanocrystalline α-K4P6, K4P3 and KP, and amorphous K4P6, KP and K3P phases, among which, the amorphous phases are identified for the first time.},
doi = {10.1039/d0ta12141j},
journal = {Journal of Materials Chemistry. A},
number = 10,
volume = 9,
place = {United States},
year = {Tue Jan 26 00:00:00 EST 2021},
month = {Tue Jan 26 00:00:00 EST 2021}
}
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