Simultaneous evolution of structural morphology and lithium storage properties in NCM622 cathode material

doi:10.11949/0438-1157.20240983

Abstract

Abstract:

The secondary battery based on lithium-ion battery has entered the mainstream. LiNi_1-_x_-_y Co _x Mn _y O₂ (NCM) material also has a considerable commercial market in lithium-ion batteries, and is a cathode material with great application value. It has different properties depending on the nickel content. The increase of nickel ratio can increase the specific capacity, but it will also lead to the decrease of thermal stability. Therefore, high-nickel materials require higher requirements on the preparation process to ensure their performance. Compared with Li[Ni_0.8Co_0.1Mn_0.1]O₂ (NCM811), Li[Ni_0.6Co_0.2Mn_0.2]O₂ (NCM622) has higher specific capacity and better thermal stability. The pure phase NCM622 material is prepared using a hydrothermal method, and the optimal preparation plan is obtained by controlling the calcination temperature and calcination time. The prepared NCM622 material can achieve a discharge specific capacity of up to 191.3 mA·h·g^-1 under optimal conditions, and the charge-discharge cycle can also have a capacity retention rate of up to 88.74%.

Key words: lithium ion battery, cathode materials, layered oxides, electrochemistry

摘要：

当前以锂离子电池为主的二次电池已经步入主流。LiNi_1-_x_-_y Co _x Mn _y O₂(NCM)材料在锂离子电池中具有较大的商业市场，是一种具备极大应用价值的正极材料。根据镍的含量不同具备不同的性能。镍比例的增加能使比容量提高，也会导致热稳定性下降，对于高镍材料需要对制备工艺有更高的要求确保其性能。相对 Li[Ni_0.8Co_0.1Mn_0.1]O₂(NCM811)，Li[Ni_0.6Co_0.2Mn_0.2]O₂(NCM622)在具备较高比容量的同时热稳定性更优秀。对纯相NCM622材料使用水热法进行制备，通过控制煅烧温度和煅烧时间得出最佳制备方案。所制备的NCM622材料在最佳条件下能够达到最高191.3 mA·h·g^-1的放电比容量，充放电循环有最高88.74%的容量保持率。

关键词: 锂离子电池, 正极材料, 层状氧化物, 电化学

CLC Number:

TQ 028.8

Kun LI, Rui HUANG, Jun CONG, Haitao MA, Longjiao CHANG, Shaohua LUO. Simultaneous evolution of structural morphology and lithium storage properties in NCM622 cathode material[J]. CIESC Journal, 2025, 76(4): 1831-1840.

李坤, 黄锐, 丛君, 马海涛, 常龙娇, 罗绍华. NCM622正极材料结构形态和储锂特性的同步演变[J]. 化工学报, 2025, 76(4): 1831-1840.

Figures/Tables 10

Fig.1 Flow chart of experiment

Fig.2 XRD patterns (a) and SEM images [(b)—(d)] of NCM622 prepared at different calcination temperatures

Fig.3 Rietveld XRD patterns[(a)—(c)] and formation energy (d) of NCM622 prepared at different calcination temperatures

Fig.4 First charge-discharge curve (a), long cycle performance (b), rate performance (c) and electrochemical impedance (d) of NCM622 prepared at different calcination temperatures

Fig.5 XRD patterns (a) and SEM image (b) of NCM622 prepared at 850℃ after cycling 100 times

Fig.6 XRD patterns (a) and SEM images [(b)—(d)] of NCM622 prepared at different calcination time

Fig.7 Rietveld XRD patterns [(a)—(c)] and formation energy (d) of NCM622 prepared at different calcination time

Fig.8 First charge-discharge curve (a), long cycle performance (b), rate performance (c) and electrochemical impedance (d) of NCM622 prepared at different calcinatin time

Fig.9 XRD patterns and SEM image (b) of NCM622 prepared at 8 h after cycling 100 times

Table 1 Comparison of electrochemistry properties of different NCM622

样品	比容量性能/(mA·h·g^-1)	文献
NCM622	191.3	本研究
Li_1.2Mn_0.56Ni_0.11Co_0.13O₂	151.4	[5]
LiNi_0.6Mn_0.2Co_0.2O₂	176.3	[11]
LiNi_0.6Mn_0.2Co_0.2O₂	136.0	[15]
NMC622	176.6	[16]
Ni-rich ternary cathodes	191.1	[23]
NCM523	150.0	[24]
LiNi_0.8Co_0.1Mn_0.1O₂	186.1	[27]

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