Modification of Nickel–Cobalt–Manganese Cathode Material Prepared Using Hydrothermal Method under Pulsed High Magnetic Field

IF 2.6 4区 材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY
ChemNanoMat Pub Date : 2025-07-15 DOI:10.1002/cnma.202500015
Wenrui Sun, Genwen Lin, Xueqian Zhang, Hongming Jin, Mingyuan Zhu, Ying Li
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Abstract

High magnetic field is a unique technique for material preparation that is commonly applied in magnetic materials but seldom in electrode materials. In this study, a pulsed high-intensity magnetic field is applied in the hydrothermal synthesis of the NCM523 precursor, specifically during the formation and growth of NCM crystal particles. As a result, NCM523 had a better layered structure, alleviating the Li+/Ni2+ mixed arrangement phenomenon, and a faster Li+ diffusion rate. In addition, when the pulsed high magnetic field is applied, the Ni2+ content decreased, and the Mn4+ content increased, enhancing the electrochemical properties. In the high cutoff voltage range of 3–4.5 V and setting 1 C = 180 mA g−1, the initial specific discharge capacity of NCM523 is 190.4 mAh g−1, which is 12.1 mAh g−1 higher than that prepared without the magnetic field. After 200 cycles, the specific discharge capacity and capacity retention rate increased by 24.4 mAh g−1 and 8.5%, respectively, compared with NCM523 prepared in the absence of the magnetic field.

Abstract Image

Abstract Image

脉冲强磁场下水热法制备镍钴锰正极材料的改性研究
强磁场是一种独特的材料制备技术,通常应用于磁性材料,但很少应用于电极材料。在本研究中,脉冲强磁场应用于水热合成NCM523前驱体,特别是在NCM晶体颗粒的形成和生长过程中。结果表明,NCM523具有更好的层状结构,减轻了Li+/Ni2+的混合排列现象,Li+的扩散速度更快。此外,在脉冲强磁场作用下,Ni2+含量降低,Mn4+含量增加,电化学性能增强。在3 ~ 4.5 V的高截止电压范围内,设置1c = 180 mA g−1,NCM523的初始比放电容量为190.4 mAh g−1,比无磁场制备的NCM523的初始比放电容量高12.1 mAh g−1。循环200次后,与无磁场条件下制备的NCM523相比,比放电容量和容量保持率分别提高了24.4 mAh g−1和8.5%。
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来源期刊
ChemNanoMat
ChemNanoMat Energy-Energy Engineering and Power Technology
CiteScore
6.10
自引率
2.60%
发文量
236
期刊介绍: ChemNanoMat is a new journal published in close cooperation with the teams of Angewandte Chemie and Advanced Materials, and is the new sister journal to Chemistry—An Asian Journal.
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