基于水热/溶剂热法制备不同形貌LiNi0.8Co0.1Mn0.1O2 锂离子电池正极材料

doi:10.19964/j.issn.1006-4990.2021-0234

Abstract

Abstract:

LiNi_0.8Co_0.1Mn_0.1O₂electrode material was prepared by hydrothermal/solvothermal method.Two precursors of Ni_0.8Co_0.1Mn_0.1（OH）₂ with different morphology were synthesized by adjusting the solvent composition and controlling the nu-cleation and growth rate of Ni_0.8Co_0.1Mn_0.1（OH）₂ with nickel,cobalt and manganese acetate as raw materials,hexamethylene tetramine as precipitant and water or ethanol as solvent.LiNi_0.8Co_0.1Mn_0.1O₂ cathode material was obtained by lithium mixed calcination,and its electrochemical property was studied and compared.By using water as the solvent,the prepared precursor composed of rectangular parallelepiped secondary particles was synthesized,which were assembled by plate-like primary particles.The obtained product exhibited a high specific discharge capacity of 189.70 mA·h/g and a capacity retention of 69.72% after 200 cycles at 0.5C.By using ethanol as the solvent,the spherical secondary particle precursor was synthesized.The final product was evolved into porous spherical structure and exhibited excellent cycle performance.It delivered a specific discharge capacity of 178.65 mA·h/g and a high capacity retention of 94.55% after 200 cycles at 0.5C.

Key words: lithium-ion battery, Ni-rich cathode material, hydrothermal, solvothermal

CLC Number:

TQ131.11

WU Zhaoguo,CAO Jun,YANG Zeheng. Preparation of LiNi_0.8Co_0.1Mn_0.1O₂ cathode materials with different morphologies based on hydrothermal/solvothermal method[J]. Inorganic Chemicals Industry, 2022, 54(2): 72-77.

Figures/Tables 9

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Table 3

References 17

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样品编号	a/nm	c/nm	c/a	I_（003）/I_（104）
LNCM-1	0.287 15	1.419 21	4.942 3	1.382 7
LNCM-2	0.286 21	1.414 48	4.942 1	1.378 5
LNCM-3	0.286 51	1.413 53	4.933 6	1.372 6

样品	ρ（Ni）/ （mg·L^-1）	ρ（Co）/ （mg·L^-1）	ρ（Mn）/ （mg·L^-1）	n（Ni）∶n（Co）∶ n（Mn）
LNCM-1	1 652.15	217.08	223.02	77.31∶10.23∶10.51
LNCM-2	1 960.45	264.62	260.86	77.12∶10.41∶10.27
LNCM-3	1 780.40	245.85	248.65	76.17∶10.52∶10.64

样品	D_Li⁺（cm²/s）（锂离子嵌入）	D_Li⁺（cm²/s）（锂离子脱出）
LNCM-1	6.97×10^-11	2.56×10^-11
LNCM-2	2.88×10^-11	1.41×10^-11
LNCM-3	1.18×10^-11	1.19×10^-11

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Preparation of LiNi_0.8Co_0.1Mn_0.1O₂ cathode materials with different morphologies based on hydrothermal/solvothermal method

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Preparation of LiNi0.8Co0.1Mn0.1O2 cathode materials with different morphologies based on hydrothermal/solvothermal method