Tungsten and phosphate polyanion co-doping of Ni-ultrahigh cathodes greatly enhancing crystal structure and interface stability

doi:10.1016/j.cjche.2021.04.001

Chinese Journal of Chemical Engineering ›› 2021, Vol. 37 ›› Issue (9): 144-151.DOI: 10.1016/j.cjche.2021.04.001

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Tungsten and phosphate polyanion co-doping of Ni-ultrahigh cathodes greatly enhancing crystal structure and interface stability

Huawei Zhu, Haifeng Yu, Zhaofeng Yang, Hao Jiang, Chunzhong Li

Shanghai Engineering Research Center of Hierarchical Nanomaterials, Frontiers Science Center for Materiobiology and Dynamic Chemistry, School of Materials Science and Engineering, East China University of Science & Technology, Shanghai 200237, China

Received:2020-12-29 Revised:2021-04-01 Online:2021-11-02 Published:2021-09-28
Contact: Hao Jiang
Supported by:
This work was supported by the National Natural Science Foundation of China (91834301), the Innovation Program of Shanghai Municipal Education Commission, the Shanghai Scientific and Technological Innovation Project (18JC1410500), and the Fundamental Research Funds for the Central Universities (222201718002).

Tungsten and phosphate polyanion co-doping of Ni-ultrahigh cathodes greatly enhancing crystal structure and interface stability

Huawei Zhu, Haifeng Yu, Zhaofeng Yang, Hao Jiang, Chunzhong Li

Shanghai Engineering Research Center of Hierarchical Nanomaterials, Frontiers Science Center for Materiobiology and Dynamic Chemistry, School of Materials Science and Engineering, East China University of Science & Technology, Shanghai 200237, China

通讯作者: Hao Jiang
基金资助:
This work was supported by the National Natural Science Foundation of China (91834301), the Innovation Program of Shanghai Municipal Education Commission, the Shanghai Scientific and Technological Innovation Project (18JC1410500), and the Fundamental Research Funds for the Central Universities (222201718002).

Abstract

Abstract: The Ni-ultrahigh cathode material is one of the best choices for further increasing energy-density of lithium-ion batteries (LIBs), but they generally suffer from the poor structure stability and rapid capacity fade. Herein, the tungsten and phosphate polyanion co-doped LiNi_0.9Co_0.1O₂ cathode materials are successfully fabricated in terms of Li(Ni_0.9Co_0.1)_1-xW_xO_2-4y(PO₄)_y by the precursor modification and subsequent annealing. The higher bonding energy of W-O (672 kJ·mol^-1) can extremely stabilize the lattice oxygen of Ni-rich oxides compared with Ni-O (391.6 kJ·mol^-1) and Co-O (368 kJ·mol^-1). Meanwhile, the stronger bonding of Ni-(PO₄^3-) vs. Ni-O could fix Ni cations in the transition metal layer, and hence suppressing the Li/Ni disorder during the charge/discharge process. Therefore, the optimized Li(Ni_0.9Co_0.1)_0.99W_0.01O_1.96(PO₄)_0.01 delivers a remarkably extended cycling life with 95.1% retention of its initial capacity of 207.4 mA·h·g^-1 at 0.2 C after 200 cycles. Meantime, the heteroatoms doping does not sacrifice the specific capacity even at different rates.

Key words: LiNi_0.9Co_0.1O₂, Co-doping, Crystal stability, Cycling life, Li-ion batteries

摘要： The Ni-ultrahigh cathode material is one of the best choices for further increasing energy-density of lithium-ion batteries (LIBs), but they generally suffer from the poor structure stability and rapid capacity fade. Herein, the tungsten and phosphate polyanion co-doped LiNi_0.9Co_0.1O₂ cathode materials are successfully fabricated in terms of Li(Ni_0.9Co_0.1)_1-xW_xO_2-4y(PO₄)_y by the precursor modification and subsequent annealing. The higher bonding energy of W-O (672 kJ·mol^-1) can extremely stabilize the lattice oxygen of Ni-rich oxides compared with Ni-O (391.6 kJ·mol^-1) and Co-O (368 kJ·mol^-1). Meanwhile, the stronger bonding of Ni-(PO₄^3-) vs. Ni-O could fix Ni cations in the transition metal layer, and hence suppressing the Li/Ni disorder during the charge/discharge process. Therefore, the optimized Li(Ni_0.9Co_0.1)_0.99W_0.01O_1.96(PO₄)_0.01 delivers a remarkably extended cycling life with 95.1% retention of its initial capacity of 207.4 mA·h·g^-1 at 0.2 C after 200 cycles. Meantime, the heteroatoms doping does not sacrifice the specific capacity even at different rates.

关键词: LiNi_0.9Co_0.1O₂, Co-doping, Crystal stability, Cycling life, Li-ion batteries

Huawei Zhu, Haifeng Yu, Zhaofeng Yang, Hao Jiang, Chunzhong Li. Tungsten and phosphate polyanion co-doping of Ni-ultrahigh cathodes greatly enhancing crystal structure and interface stability[J]. Chinese Journal of Chemical Engineering, 2021, 37(9): 144-151.

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Tungsten and phosphate polyanion co-doping of Ni-ultrahigh cathodes greatly enhancing crystal structure and interface stability

Tungsten and phosphate polyanion co-doping of Ni-ultrahigh cathodes greatly enhancing crystal structure and interface stability

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