Precursor with special structure for improving the performance of the ternary cathode material of Li-ion batteries

doi:10.19799/j.cnki.2095-4239.2021.0471

Abstract

Abstract:

When preparing precursors, materials with various morphologies can be obtained by controlling different reaction conditions. Notably, the ammonia condition significantly affects morphology. Herein, high-nickel ternary precursor materials with different morphologies were prepared under different ammonia conditions. It was found that the precursor prepared under low-ammonia condition had fine whiskers on the surface, dense internal structure, and branching-like external structure. After sintering the precursor material, the primary particles still grew radially, and more slender than in other conditions. After fabricating the button battery, the capacity reached 210.3 mA·h/g at 0.2 C discharge, and the first charge-discharge efficiency reached 93.05%, with excellent cycle and rate performance. Herein, the discharge capacity of the device increased by 3% compared with the same ratio of commercial devices. The morphology control method provides a new idea for the large-scale preparation of high specific capacity ternary cathode materials.

Key words: lithium-ion battery, precursor, cathode, ammonia value, morphology, specific capacity

CLC Number:

TM 912

Chunlin YU, Xudong CHEN, Toshio MIYAGAWA, Hui SUN, Xingwang ZHANG, Lige TONG. Precursor with special structure for improving the performance of the ternary cathode material of Li-ion batteries[J]. Energy Storage Science and Technology, 2022, 11(3): 1000-1007.

Figures/Tables 12

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样品	D_min/μm	D₁₀/μm	D₅₀/μm	D₉₀/μm	D_max/μm
NCM-PL	3.43	5.14	6.83	11.90	14.00
NCM-PM	3.39	5.32	7.03	12.39	14.10
NCM-PH	4.20	5.68	7.59	13.39	21.32

指标	NCM-L	NCM-M	NCM-H	市售产品
BET/(m²/g)	1.29	0.86	0.58	0.53
D₅₀/μm	6.97	6.88	7.03	7.02
Li/%	1.03	1.03	1.03	1.02
Ni/%	0.827	0.828	0.825	0.825
Co/%	0.121	0.118	0.12	0.12
Mn/%	0.052	0.054	0.055	0.055
松装/(g/cm³)	1.64	1.72	1.79	1.77
H₂O/10^-6	586	562	514	534
自由Li⁺/%	1140	1433	1362	1450

产品	0.2 C放电容量/(mA·h/g)	首效/%	300圈循环保持率/%	4.5 C倍率容量保持率/%
NCM-L	210.3	93.05	92	74.4
市售产品	204	92	92	65.5

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