Effect of precursor microstructure on the performance of LiNi0.85Co0.10Mn0.05O2 cathode materials

doi:10.19799/j.cnki.2095-4239.2019.0291

Abstract

Abstract:

In this work, the nucleation and crystal growth processes of the precursor can be controlled by adjusting the ammonia concentration and pH value during the co-precipitation processes, and two types of high-nickel Ni_0.85Co_0.10Mn_0.05(OH)₂ precursors with different particle structures (agglomerated vs. uniform) are synthesized. The as-synthesized precursors show almost similar physical and chemical properties. After sintering process, the obtained LiNi_0.85Co_0.10Mn_0.05O₂ cathodes also showed similar initial charge/discharge capacities and rate performance. However, LiNi_0.85Co_0.10Mn_0.05O₂ cathode resulted from the precursor with uniform structure demonstrates better cycling performance (98.3% capacity retention after 50 cycles at 1 C) than that of the cathode with agglomerated structure (96.9%). The LiNi_0.85Co_0.10Mn_0.05O₂cathode with uniform structure shows stable redox peak position and voltage interval after cycle test by dQ ·dV ^-1 analysis, which indicated the lower polarization loss. Further SEM characterization also revealed the suppression of the microcracks that maintain the mechanical integrity of the particles throughout the cycling process along with the establishment of a stable electrode/electrolyte interface to improved cycling stability.

Key words: lithium ion battery, cathode precursors, secondary particle microstructure, LiNi_0.85Co_0.10Mn_0.05O₂

CLC Number:

TM 912

CHEN Long, ZHANG Erdong, IQBAL Azhar, LI Daocong, YANG Maoping, XIA Xin. Effect of precursor microstructure on the performance of LiNi_0.85Co_0.10Mn_0.05O₂ cathode materials[J]. Energy Storage Science and Technology, 2020, 9(2): 409-414.

Figures/Tables 7

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Table 1

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References 14

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理化指标			典型值	B1	B2
物理指标	PSD/μm	Dmin	≥3.0	4.6	5.1
		D10	6.0~8.0	7.6	7.4
		D50	9.8~11.0	10.5	10.8
		D90	13.0~17.0	14.4	14.7
		Dmax	≤24	19.5	20.2
	比表面/m².g^-1		6±1.5	5.3	5.1
	振实密度/g·cc^-1		≥2.1	2.1	2.2
	水分/μg.g^-1		≤5000	3400	3800
化学指标	主元素质量含量	Ni/%	52.5±1	52.8	52.6
		Co/%	6.2±0.4	6.4	6.3
		Mn/%	2.8±0.3	2.9	2.8
	杂质含量	Ca/μg.g^-1	≤80	37	53
		Na/μg.g^-1	≤300	140	110
		Mg/μg.g^-1	≤100	46	37
		Cr/μg.g^-1	≤10	ND	ND
		Fe/μg.g^-1	≤30	10	10
		Cu/μg.g^-1	≤5	ND	2.2
		Zn/μg.g^-1	≤10	2	2
		S/μg.g^-1	≤1500	1200	1100
	磁性异物含量	Fe/ng.g^-1	≤50	16	15
		Cr/ng.g^-1		6	4
		Zn/ng.g^-1		2	1

样品	c	a	体积/?³	c/a	Ni²⁺/Li⁺ 混排摩尔百分比
BC1	14.1942	2.8709	33.7722	4.9442	0.03
BC2	14.1876	2.8719	33.7787	4.9401	0

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Effect of precursor microstructure on the performance of LiNi_0.85Co_0.10Mn_0.05O₂ cathode materials

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