Influence of synergistic effect of LiNi0.8Co0.15Al0.05O2@Cr2O5 composite on the electrochemical properties

doi:10.1016/j.cjche.2020.09.017

Chinese Journal of Chemical Engineering ›› 2021, Vol. 33 ›› Issue (5): 327-336.DOI: 10.1016/j.cjche.2020.09.017

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Influence of synergistic effect of LiNi_0.8Co_0.15Al_0.05O₂@Cr₂O₅ composite on the electrochemical properties

Yunke Wang^1,2, Yongjia Li³, Yenan Zhang^1,2, Guozheng Zha^1,2, Feng Liang^1,2, Yongnian Dai^1,2, Yaochun Yao^1,2

1 The National Engineering Laboratory for Vacuum Metallurgy, Kunming University of Science and Technology, Kunming 650093, China;
2 Engineering Laboratory for Advanced Battery and Materials of Yunnan Province, Kunming University of Science and Technology, Kunming 650093, China;
3 Faculty of Metallurgy and Mining, Kunming Metallurgy College, Kunming 650033, China

Received:2020-06-11 Revised:2020-07-23 Online:2021-08-19 Published:2021-05-28
Contact: Yaochun Yao
Supported by:
This work was financially supported by the National Natural Science Foundation of China (52064031), the Program for Innovative Research Team in the University of Ministry of Education of China (IRT_17R48) and National Natural Science Foundation of China (51674129). The authors sincerely acknowledge the anonymous reviewers for their insights and comments to further improve the quality of the manuscript.

Influence of synergistic effect of LiNi_0.8Co_0.15Al_0.05O₂@Cr₂O₅ composite on the electrochemical properties

Yunke Wang^1,2, Yongjia Li³, Yenan Zhang^1,2, Guozheng Zha^1,2, Feng Liang^1,2, Yongnian Dai^1,2, Yaochun Yao^1,2

1 The National Engineering Laboratory for Vacuum Metallurgy, Kunming University of Science and Technology, Kunming 650093, China;
2 Engineering Laboratory for Advanced Battery and Materials of Yunnan Province, Kunming University of Science and Technology, Kunming 650093, China;
3 Faculty of Metallurgy and Mining, Kunming Metallurgy College, Kunming 650033, China

通讯作者: Yaochun Yao
基金资助:
This work was financially supported by the National Natural Science Foundation of China (52064031), the Program for Innovative Research Team in the University of Ministry of Education of China (IRT_17R48) and National Natural Science Foundation of China (51674129). The authors sincerely acknowledge the anonymous reviewers for their insights and comments to further improve the quality of the manuscript.

Abstract

Abstract: LiNi_0.8Co_0.15Al_0.05O₂ (NCA)@Cr₂O₅ composite electrode combines the high rate-capability characteristics of NCA with the stability of Cr₂O₅, playing a synergistic role in improving the cyclic stability, initial discharge capacity and the security of low cut-off voltage (2.0 V). When the mass ratio of Cr₂O₅ in NCA is 45% (mass), the capacity retention rate increases from 58.5% without Cr₂O₅ to 69.3% in the range of 2.0-4.3 V. The initial discharge capacity of NCA@Cr₂O₅ composite material is 211.4 mA·h·g^-1, its first coulombic efficiency is 94.2%, and the charging capacity remains approximately constant when mixed with 15% (mass) Cr₂O₅. The reason for the improvement of the initial charge-discharge efficiency (ICDE) was explained. Impedance and cyclic voltammetry analysis reveal more detailed reasons of the observed improvements. Compared with NCA cathode material, the NCA@Cr₂O₅ composite material can provide not only additional stable sites and channels for Li⁺ insertion/extraction to make up for the loss of active Li⁺ sites and prevent the accumulation of Li⁺ in the circulation process, but also protect the NCA electrode from the corrosion of the electrolyte decomposition by the Cr₂O₅ nanoparticles adhering to NCA interface.

Key words: NCA@Cr₂O₅ composite, Cathode material, Synergistic effect, Electrochemical properties, Low voltage

摘要： LiNi_0.8Co_0.15Al_0.05O₂ (NCA)@Cr₂O₅ composite electrode combines the high rate-capability characteristics of NCA with the stability of Cr₂O₅, playing a synergistic role in improving the cyclic stability, initial discharge capacity and the security of low cut-off voltage (2.0 V). When the mass ratio of Cr₂O₅ in NCA is 45% (mass), the capacity retention rate increases from 58.5% without Cr₂O₅ to 69.3% in the range of 2.0-4.3 V. The initial discharge capacity of NCA@Cr₂O₅ composite material is 211.4 mA·h·g^-1, its first coulombic efficiency is 94.2%, and the charging capacity remains approximately constant when mixed with 15% (mass) Cr₂O₅. The reason for the improvement of the initial charge-discharge efficiency (ICDE) was explained. Impedance and cyclic voltammetry analysis reveal more detailed reasons of the observed improvements. Compared with NCA cathode material, the NCA@Cr₂O₅ composite material can provide not only additional stable sites and channels for Li⁺ insertion/extraction to make up for the loss of active Li⁺ sites and prevent the accumulation of Li⁺ in the circulation process, but also protect the NCA electrode from the corrosion of the electrolyte decomposition by the Cr₂O₅ nanoparticles adhering to NCA interface.

关键词: NCA@Cr₂O₅ composite, Cathode material, Synergistic effect, Electrochemical properties, Low voltage

Yunke Wang, Yongjia Li, Yenan Zhang, Guozheng Zha, Feng Liang, Yongnian Dai, Yaochun Yao. Influence of synergistic effect of LiNi_0.8Co_0.15Al_0.05O₂@Cr₂O₅ composite on the electrochemical properties[J]. Chinese Journal of Chemical Engineering, 2021, 33(5): 327-336.

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Influence of synergistic effect of LiNi_0.8Co_0.15Al_0.05O₂@Cr₂O₅ composite on the electrochemical properties

Influence of synergistic effect of LiNi_0.8Co_0.15Al_0.05O₂@Cr₂O₅ composite on the electrochemical properties

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