The effects of N/P design on the performances of Ni-rich NCM/Gr lithium ion battery

doi:10.19799/j.cnki.2095-4239.2021.0576

Abstract

Abstract:

In this research, a pouch lithium-ion battery was fabricated using Li(Ni_0.8Co_0.1Mn_0.1)O₂ as cathode material and synthetic graphite as anode material. Three different N/P ratios were designed by changing the capacity of the anode. The cell initial capacity, first discharge efficiency, initial internal resistance, rate discharge, high and low temperature discharge, high-temperature storage, and cycling performance were investigated, and the findings indicate that increasing the N/P ratio can improve the battery's initial discharge capacity. However, increasing the N/P ratio will increase the potential of the positive electrode, and the electrolyte will be easily oxidized on the positive electrode side. The low N/P ratio may ensure that the positive electrode has a lower electrode potential, reducing side effects and improving high-temperature storage and cycling performance. However, the N/P ratio is substantially smaller, and Li⁺ is easily lowered, resulting in a loss of active lithium.

Key words: lithium ion battery, N/P ratio, high temperature storage, cycling performance, electrode potential

CLC Number:

TM 911

Haitao LI, Lingli KONG, Xin ZHANG, Chuanjun YU, Jiwei WANG, Lin XU. The effects of N/P design on the performances of Ni-rich NCM/Gr lithium ion battery[J]. Energy Storage Science and Technology, 2022, 11(7): 2040-2045.

Figures/Tables 11

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References 7

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N/P比	初始容量/mAh	首效/%	初始内阻/mΩ
1.15	4940	89.3	5.24
1.10	4920	89.1	5.20
1.05	4830	87.8	5.14

N/P比	Ni含量/ppm	Co含量/ppm	Mn含量/ppm
1.15	618.6	28.7	18.2
1.10	589.1	20.3	16.0
1.05	100.2	5.4	3.2

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