Analysis and improvement of cycle performance for Ni-rich lithium ion battery

doi:10.19799/j.cnki.2095-4239.2019.0239

Abstract

Abstract:

To investigate the fast-decay problem of Li(Ni_0.8Co_0.1Mn_0.1)O₂/graphite system cells in high-temperature cycling, the structures and morphologies of the cathode and anode were systematically analyzed in fresh and cycled cells. The characterizations were performed by X-ray diffraction, scanning electron microscopy, and inductively coupled plasma spectroscopy. After cycling, the Li/Ni cation mixing degree increased and the cathode materials cracked from the inside (even pulverized at 45 ℃). These processes reduced both the electrolyte consumption and internal resistance of the cell and hence degraded the cycling performance. After doping the cathode material, the high-temperature cycling performance can be significantly improved, with a capacity retention of 87% after 1000 cycles at 45 ℃.

Key words: Ni-rich cathode, high temperature cycle performance, failure mechanism, metal dissolution

CLC Number:

TM 912

ZHANG Xin, KONG Lingli, GAO Tengyue, LI Haitao, YAO Xiaohui, LI Fuxuan. Analysis and improvement of cycle performance for Ni-rich lithium ion battery[J]. Energy Storage Science and Technology, 2020, 9(3): 813-817.

Figures/Tables 10

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Table 1

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Table 2

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References 6

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item	fresh	RT cycle	45 ℃ cycle
I(003)/I(104)	1.5864	1.4484	1.2274
a /?	2.8652	2.8662	2.8676
c /?	14.200	14.186	14.165
c/a	4.9560	4.9494	4.9397

元素含量/μg·g^-1	Al	Mg	Zr
改善前	—	—	977
改善后	1300	650	750

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