Optimization of conductive cyclized polyacrylonitrile content to enhance the structural stability of single-crystal LiNi0.8Co0.1Mn0.1O2 cathode materials for lithium-ion batteries

IF 5.5 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Carbon Letters Pub Date : 2025-01-31 DOI:10.1007/s42823-024-00852-9

Minyue Wen, Sheng Wang, Jiawen Wang, Jiafu Yu, Shuaihao Li, Qiuyu Zeng

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引用次数: 0

Abstract

To optimize the electrochemical properties of Ni-rich cathode materials, CPAN@SC-NCM811 is prepared via surface modification of single-crystalline LiNi_0.8Co_0.1Mn_0.1O₂ cathode material by adding 1, 2 and 3 wt.% of polyacrylonitrile, respectively. Significantly, the results obtained from X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM) verify the successful synthesis of CPAN@SC-NCM811 cathode, which exhibits better electrochemical properties compared to SC-NMC811. After thorough milling and calcination of 2 wt.% polyacrylonitrile with SC-NCM811, the initial discharge specific capacity of prepared S2 sample is 197.7 mAh g⁻¹ and the capacity retention reached 89.2% after 100 cycles at a rate of 1.0 C. Furthermore, the S2 sample exhibits superior rate performance compared to the other three samples, in which these superior electrochemical properties are largely attributed to the optimal ratio of conductive cyclized polyacrylonitrile coatings. Overall, this work offers guidelines for modifying the surface of SC-NCM811 cathode materials for lithium-ion batteries with exceptional cycling and rate performance.

Graphical abstract

Preparation schematic of the CPAN@SC-NCM811 cathode materials and the corresponding cycling performance of the assembled coin cells

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优化导电环化聚丙烯腈含量，提高单晶LiNi0.8Co0.1Mn0.1O2锂离子电池正极材料的结构稳定性

为优化富镍正极材料的电化学性能，分别加入1、2、3 wt.%的聚丙烯腈对单晶LiNi0.8Co0.1Mn0.1O2正极材料进行表面改性，制备了CPAN@SC-NCM811。通过x射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、x射线光电子能谱（XPS）、场发射扫描电镜（FESEM）和透射电镜（TEM）等测试结果验证了CPAN@SC-NCM811阴极的成功合成，其电化学性能优于SC-NMC811。用SC-NCM811对2 wt.%的聚丙烯腈进行研磨和煅烧后，制备的S2样品的初始放电比容量为197.7 mAh g−1，在1.0 c的倍率下循环100次后，其容量保持率达到89.2%。此外，S2样品的倍率性能优于其他3种样品，这些优异的电化学性能很大程度上归功于导电环化聚丙烯腈涂层的最佳配比。总的来说，这项工作为SC-NCM811正极材料的表面修饰提供了指导，该材料具有优异的循环和倍率性能。图示：CPAN@SC-NCM811正极材料的制备示意图及组装后硬币电池的循环性能

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来源期刊

Carbon Letters CHEMISTRY, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

7.30

自引率

20.00%

发文量

118

期刊介绍： Carbon Letters aims to be a comprehensive journal with complete coverage of carbon materials and carbon-rich molecules. These materials range from, but are not limited to, diamond and graphite through chars, semicokes, mesophase substances, carbon fibers, carbon nanotubes, graphenes, carbon blacks, activated carbons, pyrolytic carbons, glass-like carbons, etc. Papers on the secondary production of new carbon and composite materials from the above mentioned various carbons are within the scope of the journal. Papers on organic substances, including coals, will be considered only if the research has close relation to the resulting carbon materials. Carbon Letters also seeks to keep abreast of new developments in their specialist fields and to unite in finding alternative energy solutions to current issues such as the greenhouse effect and the depletion of the ozone layer. The renewable energy basics, energy storage and conversion, solar energy, wind energy, water energy, nuclear energy, biomass energy, hydrogen production technology, and other clean energy technologies are also within the scope of the journal. Carbon Letters invites original reports of fundamental research in all branches of the theory and practice of carbon science and technology.