High-low Temperature Properties of Ni-rich LiNi0.6Co0.2Mn0.2O2 Cathode Material by Hydrothermal Synthesis with CTAB Assisted

doi:10.7503/cjcu20200507

Abstract

Abstract:

Using acetate as raw material， cetyltrimethyl ammonium bromide（CTAB） as dispersing agent， LiNi_0.6Co_0.2Mn_0.2O₂ cathode material was synthesized by hydrothermal method after high temperature two-step sintering. The experiments proved that proper addition of the dispersant CTAB can effectively adjust the particle morphology， reduce Ni²⁺/Li⁺ cation mixing and improve the electrochemical properties of the material. When 2%（mass fraction） CTAB was added， the LNi_0.6Co_0.2Mn_0.2O₂ cathode material had an ordered layered structure and the particles of the material were homogeneous and dispersed. Furthermore， and the optimal cycling performance and the high-low temperature performance were obtained. The retention rate of the material was 88.5 % after 100 cycles in the voltage range of 3.0—4.3 V at a rate of 1C and 25 ℃. The initial discharge specific capacity were 60.3， 168.5 and 207.2 mA·h/g， respectively， at a rate of 0.1C under the environmental conditions of ?20， 25 and 55 ℃， which provided a strong basis for the wider application of the material.

Key words: Ni-rich cathode material, Hydrothermal synthesis, Dispersing agent, High-low temperature performance

CLC Number:

O646

TrendMD:

ZHANG Huishuang, GAO Yanxiao, WANG Qiuxian, LI Xiangnan, LIU Wenfeng, YANG Shuting. High-low Temperature Properties of Ni-rich LiNi_0.6Co_0.2Mn_0.2O₂ Cathode Material by Hydrothermal Synthesis with CTAB Assisted[J]. Chem. J. Chinese Universities, 2021, 42(3): 819.

Figures/Tables 10

References 24

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Sample	a/nm	c/nm	R_wp(%)	R_p(%)	Cation mixing(%)	c/a	I₀₀₃/I₁₀₄
0 CTAB	0.28696	1.42094	3.56610	2.69623	4.7637	4.9517	1.12
1% CTAB	0.28736	1.42337	3.32930	2.63632	3.1269	4.9532	1.53
2% CTAB	0.28704	1.42314	3.26002	2.58101	2.4642	4.9580	2.01
3% CTAB	0.28756	1.42204	3.02911	2.38314	5.6055	4.9451	1.11

Sample	a/nm	c/nm	R_wp(%)	R_p(%)	Cation mixing(%)	c/a	I₀₀₃/I₁₀₄
0 CTAB	0.28696	1.42094	3.56610	2.69623	4.7637	4.9517	1.12
1% CTAB	0.28736	1.42337	3.32930	2.63632	3.1269	4.9532	1.53
2% CTAB	0.28704	1.42314	3.26002	2.58101	2.4642	4.9580	2.01
3% CTAB	0.28756	1.42204	3.02911	2.38314	5.6055	4.9451	1.11

Sample	Atom fraction(%)			n(Ni)/n(Co)/n(Mn)
Sample	Ni	Co	Mn	n(Ni)/n(Co)/n(Mn)
0 CTAB	23.14	8.09	6.85	2.86∶1∶0.85
2% CTAB	26.21	9.04	8.12	2.90∶1∶0.90

Sample	Atom fraction(%)			n(Ni)/n(Co)/n(Mn)
Sample	Ni	Co	Mn	n(Ni)/n(Co)/n(Mn)
0 CTAB	23.14	8.09	6.85	2.86∶1∶0.85
2% CTAB	26.21	9.04	8.12	2.90∶1∶0.90

Sample	Temperature/^oC	R_s/Ω	R_p/Ω	R₁/Ω	R₂/Ω	W_o/Ω
0 CTAB	55	1.758	14.38	151.9	—	273.1
2% CTAB	55	2.096	11.91	119.2	—	141.8
0 CTAB	25	0.68	—	129.1	—	76
2% CTAB	25	1.97	—	76.73	—	51.66
0 CTAB	-20	8.397	323.8	2618	6219	—
2% CTAB	-20	9.158	128.93	667	4536	—

High-low Temperature Properties of Ni-rich LiNi_0.6Co_0.2Mn_0.2O₂ Cathode Material by Hydrothermal Synthesis with CTAB Assisted

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