Citation: Yong-Gang LU, Bo XIANG, Zhen-Tao WANG, Peng ZHANG, Fang CHEN, Jian XIE, Xin-Bing ZHAO. Single-Crystal LiNi_0.6Co_0.2Mn_0.2O₂: Facile Preparation and Electrochemical Performance[J]. Chinese Journal of Inorganic Chemistry, ;2022, 38(4): 569-577. doi: 10.11862/CJIC.2022.055 shu

Single-Crystal LiNi_0.6Co_0.2Mn_0.2O₂: Facile Preparation and Electrochemical Performance

1.
School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
2.
Huayou New Energy Technology (Quzhou) Co., Ltd., Quzhou, Zhejiang 324000, China
3.
Zhejiang Huayou Cobalt Co., Ltd., Tongxiang, Zhejiang 314500, China
4.
Department of Chemistry, Zhejiang University, Hangzhou 310027, China

Corresponding author: Xin-Bing ZHAO, zhaoxb@zju.edu.cn
Received Date: 25 November 2021
Revised Date: 4 January 2022

Figures(5)

Single - crystal LiNi_0.6Co_0.2Mn_0.2O₂ (NCM622) was prepared by a facile solid - state calcination method at 910 ℃ using Ni_0.6Co_0.2Mn_0.2(OH)₂ and LiOH·H₂O as the precursors with no excess of LiOH·H₂O. As-obtained material can be used to make electrode slurry directly with no need to wash, dry, and anneal. Electrochemical tests showed that the single-crystal NCM622 has a high specific capacity and a long cycle life. The first discharge capacity of the sample was 181.2 mAh·g^-1 at 0.1C and 174.4 mAh·g^-1 at 0.3C. Under a current density of 0.3C, the sample delivered a discharge capacity of 150.7 mAh·g^-1 after 300 cycles with a capacity retention of 86.4%. After 500 cycles at 0.3C, a relatively high discharge capacity of 141.2 mAh·g^-1 was still maintained with a capacity retention of 81.0%. The electrochemical performance of single-crystal NCM622 prepared at 910 ℃ was better than that of polycrystalline NCM622 prepared at 850 ℃ and large-size single-crystal NCM622 prepared at 940 and 960 ℃, indicating that the reasonable calcination temperature for single crystal NCM622 was 910 ℃. The results show that the structural stability of single-crystal NCM622 can be maintained during repeated cycling.
- high nickel material,
- single crystal,
- cathode,
- solid-state calcination,
- lithium-ion battery,
- electrochemistry
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沈阳化工大学材料科学与工程学院沈阳 110142

Single-Crystal LiNi0.6Co0.2Mn0.2O2: Facile Preparation and Electrochemical Performance

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通讯作者: 陈斌, bchen63@163.com

Single-Crystal LiNi_0.6Co_0.2Mn_0.2O₂: Facile Preparation and Electrochemical Performance