Suppressing Mn Reduction of Li-Rich Mn-Based Cathodes by F-Doping for Advanced Lithium-Ion Batteries

Yong Wang; Hai Tao Gu; Jin Hua Song; Zhen He Feng; Xin Bin Zhou; Yong Ning Zhou; Ke Wang; Jing Ying Xie

doi:10.1021/acs.jpcc.8b08669

Suppressing Mn Reduction of Li-Rich Mn-Based Cathodes by F-Doping for Advanced Lithium-Ion Batteries

Yong Wang, Hai Tao Gu, Jin Hua Song, Zhen He Feng, Xin Bin Zhou, Yong Ning Zhou, Ke Wang, Jing Ying Xie

Research output: Contribution to journal › Article › peer-review

76 Scopus citations

Abstract

The Li-rich Mn-based cathode (LMR) has been considered as the most promising candidate for the next-generation secondary lithium-ion batteries. However, it suffers from structure degradation and oxygen release during cycling. To address this problem, a Li[Li_0.133Mn_0.467Ni_0.2Co_0.2]O_1.95F_0.05 cathode material was synthesized via polyacrylamide-assisted carbonate coprecipitation. With the partial replacement of an oxygen-metal (M-O) bond with a fluorine-metal (M-F) bond, the initial columbic efficiency, cycle performance, and voltage degradation have been improved effectively. In situ X-ray diffraction upon heating reveals that the structure stability of LMR can be improved by F-doping. The charge compensation of F-doped LMR is revealed by X-ray absorption spectroscopy during cycling. It is found that Mn reduction upon cycling can be suppressed effectively by F-doping in LMR. These results provide an in-depth understanding of F-doping effect on the optimization of Li-rich cathode materials for advanced lithium-ion batteries.

Original language	English
Pages (from-to)	27836-27842
Number of pages	7
Journal	Journal of Physical Chemistry C
Volume	122
Issue number	49
DOIs	https://doi.org/10.1021/acs.jpcc.8b08669
State	Published - 13 Dec 2018
Externally published	Yes

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title = "Suppressing Mn Reduction of Li-Rich Mn-Based Cathodes by F-Doping for Advanced Lithium-Ion Batteries",

abstract = "The Li-rich Mn-based cathode (LMR) has been considered as the most promising candidate for the next-generation secondary lithium-ion batteries. However, it suffers from structure degradation and oxygen release during cycling. To address this problem, a Li[Li0.133Mn0.467Ni0.2Co0.2]O1.95F0.05 cathode material was synthesized via polyacrylamide-assisted carbonate coprecipitation. With the partial replacement of an oxygen-metal (M-O) bond with a fluorine-metal (M-F) bond, the initial columbic efficiency, cycle performance, and voltage degradation have been improved effectively. In situ X-ray diffraction upon heating reveals that the structure stability of LMR can be improved by F-doping. The charge compensation of F-doped LMR is revealed by X-ray absorption spectroscopy during cycling. It is found that Mn reduction upon cycling can be suppressed effectively by F-doping in LMR. These results provide an in-depth understanding of F-doping effect on the optimization of Li-rich cathode materials for advanced lithium-ion batteries.",

author = "Yong Wang and Gu, {Hai Tao} and Song, {Jin Hua} and Feng, {Zhen He} and Zhou, {Xin Bin} and Zhou, {Yong Ning} and Ke Wang and Xie, {Jing Ying}",

note = "Publisher Copyright: {\textcopyright} 2018 American Chemical Society.",

year = "2018",

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day = "13",

doi = "10.1021/acs.jpcc.8b08669",

language = "英语",

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T1 - Suppressing Mn Reduction of Li-Rich Mn-Based Cathodes by F-Doping for Advanced Lithium-Ion Batteries

AU - Wang, Yong

AU - Gu, Hai Tao

AU - Song, Jin Hua

AU - Feng, Zhen He

AU - Zhou, Xin Bin

AU - Zhou, Yong Ning

AU - Wang, Ke

AU - Xie, Jing Ying

PY - 2018/12/13

Y1 - 2018/12/13

N2 - The Li-rich Mn-based cathode (LMR) has been considered as the most promising candidate for the next-generation secondary lithium-ion batteries. However, it suffers from structure degradation and oxygen release during cycling. To address this problem, a Li[Li0.133Mn0.467Ni0.2Co0.2]O1.95F0.05 cathode material was synthesized via polyacrylamide-assisted carbonate coprecipitation. With the partial replacement of an oxygen-metal (M-O) bond with a fluorine-metal (M-F) bond, the initial columbic efficiency, cycle performance, and voltage degradation have been improved effectively. In situ X-ray diffraction upon heating reveals that the structure stability of LMR can be improved by F-doping. The charge compensation of F-doped LMR is revealed by X-ray absorption spectroscopy during cycling. It is found that Mn reduction upon cycling can be suppressed effectively by F-doping in LMR. These results provide an in-depth understanding of F-doping effect on the optimization of Li-rich cathode materials for advanced lithium-ion batteries.

AB - The Li-rich Mn-based cathode (LMR) has been considered as the most promising candidate for the next-generation secondary lithium-ion batteries. However, it suffers from structure degradation and oxygen release during cycling. To address this problem, a Li[Li0.133Mn0.467Ni0.2Co0.2]O1.95F0.05 cathode material was synthesized via polyacrylamide-assisted carbonate coprecipitation. With the partial replacement of an oxygen-metal (M-O) bond with a fluorine-metal (M-F) bond, the initial columbic efficiency, cycle performance, and voltage degradation have been improved effectively. In situ X-ray diffraction upon heating reveals that the structure stability of LMR can be improved by F-doping. The charge compensation of F-doped LMR is revealed by X-ray absorption spectroscopy during cycling. It is found that Mn reduction upon cycling can be suppressed effectively by F-doping in LMR. These results provide an in-depth understanding of F-doping effect on the optimization of Li-rich cathode materials for advanced lithium-ion batteries.

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M3 - 文章

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SN - 1932-7447

VL - 122

SP - 27836

EP - 27842

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

IS - 49

ER -

Suppressing Mn Reduction of Li-Rich Mn-Based Cathodes by F-Doping for Advanced Lithium-Ion Batteries

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