Citation: Ming-Ming REN, Ze-Ping LIU, Zhen-Luo YUAN, Yang WANG, Guang-Xin FAN, Bao-Zhong LIU, Cheng-Guo LUO. Microscopic Mechanism of Influence of Doping F on Structure and Performance of LiNi_0.8Co_0.1Mn_0.1O₂[J]. Chinese Journal of Inorganic Chemistry, ;2021, 37(6): 1046-1054. doi: 10.11862/CJIC.2021.120 shu

Microscopic Mechanism of Influence of Doping F on Structure and Performance of LiNi_0.8Co_0.1Mn_0.1O₂

Ming-Ming REN ^{1, 2} ,
Ze-Ping LIU ³ ,
Zhen-Luo YUAN ² ,
Yang WANG ¹ ,
Guang-Xin FAN ^{1, 3,,} ,
Bao-Zhong LIU ² ,
Cheng-Guo LUO ³

1.
School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo, Henan 454000, China
2.
College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo, Henan 454000, China
3.
Jiaozuo Companion Nano Materials Engineering Co., Ltd., Jiaozuo, Henan 454000, China

Corresponding author: Guang-Xin FAN, fangx@hpu.edu.cn
Received Date: 12 January 2021
Revised Date: 20 April 2021

Figures(12)

The cathode material LiNi_0.8Co_0.1Mn_0.1O₂ for lithium ion battery was doped by F using a high temperature solid state method with lithium fluoride. The microscopic mechanism of F affecting the structure and performance of LiNi_0.8Co_0.1Mn_0.1O₂ was investigated by X-ray diffraction (XRD), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS) and electrochemical measurements. The results show that appropriate dosage of F can increase the specific discharge capacity, rate capability, cycle performance and thermal stability of the cathode material. The optimum comprehensive performance of the material can be obtained at F molar fraction of 1.5%, the initial discharge specific capacity (0.2C) and capacity retention rate after 50 cycles (1C) were increased from the original 174.0 mAh·g^-1 (78.7%) to 178.6 mAh·g^-1 (85.7%), respectively. The improvement performance of the LiNi_0.8Co_0.1Mn_0.1O₂ cathode material by F doping can be attributed to the ability of F to enhance the bonding between the transition metal, lithium and oxygen layers, which improves the structural stability of the material. In addition, F-doping is beneficial to decrease the interface impedance and charge transfer impedance during the electrochemical reaction.
- lithium ion battery,
- LiNi_0.8Co_0.1Mn_0.1O₂,
- F doping,
- electrochemical performance,
- thermal stability
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沈阳化工大学材料科学与工程学院沈阳 110142

Microscopic Mechanism of Influence of Doping F on Structure and Performance of LiNi0.8Co0.1Mn0.1O2

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通讯作者: 陈斌, bchen63@163.com

Microscopic Mechanism of Influence of Doping F on Structure and Performance of LiNi_0.8Co_0.1Mn_0.1O₂