Preparation and Properties of LiNi0.6Co0.2Mn0.2O2 Cathode Material for High Specific Capacity Lithium Ion Battery

doi:10.19894/j.issn.1000-0518.210543

Chinese Journal of Applied Chemistry ›› 2022, Vol. 39 ›› Issue (8): 1209-1215.DOI: 10.19894/j.issn.1000-0518.210543

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Preparation and Properties of LiNi_0.6Co_0.2Mn_0.2O₂ Cathode Material for High Specific Capacity Lithium Ion Battery

En-Tong WANG(), Lin-Fang YANG

Department of Chemistry and Chemical Engineering，Lvliang University，Lvliang 033000，China

Received:2021-11-22 Accepted:2022-02-17 Published:2022-08-01 Online:2022-08-04
Contact: En-Tong WANG
About author:1683190608@qq.com
Supported by:
the Science and Technology Innovation Project of Colleges and Universities in Shanxi Province(2020L0681);the Key R&D Project of Luliang City(2019GYGG-89)

Abstract

Abstract:

This article takes LiNi_0.6Co_0.2Mn_0.2O₂ as the research object， and LiNi_0.6Co_0.2Mn_0.2O₂ ternary cathode materials （NCM） with different F element molar doping amounts （0%， 1%， 3%， 5%） are prepared by a co-precipitation method. The analysis of the lattice structure， microscopic morphology， and electrochemical properties of the NCM material reveals that the F doping improves the crystallinity of the NCM material and reduces the degree of cation disorder. A proper amount of F doping impurities help reduce the size of the NCM ternary cathode material and improve the uniformity. The doping of F can also reduce the polarization phenomenon of the NCM ternary cathode material. The initial discharge specific capacity increases first and then decreases with the increase of the doping content of F. The cycle performance is obtained with the doping of F. The NCM ternary cathode material with 3% F doping content has an initial discharge specific capacity of 167.2 mA·h/g， a capacity retention rate of 98.5%， low impedance， and optimal electrochemical performance.

Key words: Lithium Ion Battery, Cathode material, LiNi_0.6Co_0.2Mn_0.2O₂, F doping, Specific capacity, Capacity retention rate

CLC Number:

O646.5

En-Tong WANG, Lin-Fang YANG. Preparation and Properties of LiNi_0.6Co_0.2Mn_0.2O₂ Cathode Material for High Specific Capacity Lithium Ion Battery[J]. Chinese Journal of Applied Chemistry, 2022, 39(8): 1209-1215.

Figures/Tables 6

Fig.1 XRD analysis of F-doped NCM ternary cathode materials

Table 1 Lattice parameters of F?doped NCM ternary cathode materials

F掺杂率 F doping percent/%	a/nm	c/nm	c/a	I_（003）/I_（104）
0	0.284 5	1.412 6	4.965	1.342
1	0.285 5	1.413 5	4.953	1.368
3	0.285 6	1.413 9	4.951	1.374
5	0.285 4	1.411 7	4.947	1.369

Fig. 2 SEM of F-doped NCM ternary cathode materialsA－D are the SEM images of the NCM materials with 0%, 1%, 3% and 5% of F doping, respectively, and E and F are the SEM images of the NCM materials doped with 1% and 3% F, respectively, at a magnification of 3000 times

Fig.3 First discharge curve of F-doped NCM ternary cathode materials

Fig.4 Cycle performance curves of F-doped NCM ternary cathode material

Fig.5 Impedance curves of F-doped NCM ternary cathode material

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Preparation and Properties of LiNi_0.6Co_0.2Mn_0.2O₂ Cathode Material for High Specific Capacity Lithium Ion Battery

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