Cycle performance and degradation mechanism of Ni-Rich NCA， NCM， and NCMA

doi:10.19799/j.cnki.2095-4239.2022.0434

Abstract

Abstract:

To compare the effects of aluminum and manganese elements on the cycle performance of high-nickel cathode materials and further determine the differences in cycling stability and degradation mechanisms of nickel-cobalt-aluminum (NCA), nickel-cobalt-manganese (NCM), and nickel-cobalt-manganese-aluminum (NCMA), three common NCA, NCM, and NCMA high-nickel cathode materials with the same nickel content were chosen to study their similarities and differences of the cycle performance and the structural changes. The outcomes show that the three high-nickel cathode materials' cycle performance under room temperature is in the order of NCA>NCMA>NCM. Additionally, discovered by differential capacity (dQ/dV) curve and scanning electron microscopy, the degree of structural damages of the three materials at the same stage is in the order of NCM>NCMA>NCA, and the capacity decay of the battery during cycling is primarily caused the structural damages of the cathode materials. More study was performed on the cathode materials by electrochemical impedance spectroscopy at various cycle stages. It was discovered that the impedance of the cathodes continued to increase during cycling, and the impedance increase was influenced by the modifications in the crystal and the secondary particle structures. The discrepancies in the cycle performance of the three high-nickel cathode materials would ultimately be caused because the cycle stability of the cells is directly tied to the structural stability of the cathode materials. Systematic comparison and analysis of the cycle performance of NCA, NCMA, and NCM are helpful to deepen the understanding of the composition-structure-performance relationship of high-nickel content cathode materials, and it is of great significance for improving their cycle stabilities.

Key words: Ni-rich cathode materials, capacity loss, cycle stability, structural changes

CLC Number:

TM 911

Mengyang ZU, Meng ZHANG, Zikun LI, Ling HUANG. Cycle performance and degradation mechanism of Ni-Rich NCA， NCM， and NCMA[J]. Energy Storage Science and Technology, 2023, 12(1): 51-60.

Figures/Tables 11

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材料	组分	D₅₀/μm	比容量/(mAh/g)	首次循环效率/%
NCA	Ni88-Co9-Al3	11.1	208.5	89.8
NCMA	Ni88-Co6-Mn3-Al3	11.7	210.7	88.2
NCM	Ni88-Co9-Mn3	12.4	217	90.6

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