F 掺杂对正极材料 Li1.2Mn0.54Ni0.13Co0.13O2 的微观结构和电化学性能的影响

IF 4.1 2区材料科学 Q2 ENGINEERING, CHEMICAL

Particuology Pub Date : 2024-09-24 DOI:10.1016/j.partic.2024.09.009

Xiaoqian Sun , Yunhui Du , Weiyi Zhang , Mengjiao Jin , Ruiang Fan , Peng Zhang

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引用次数: 0

摘要

富锂锰基（Li-rich Mn-based）正极材料具有高比容量、低自放电率和稳定的工作电压，但循环性能和速率性能有待进一步提高。本研究采用共沉淀法和两步煅烧法合成了 Li1.2Mn0.54Ni0.13Co0.13O2-xFx (x = 0, 0.02, 0.05, 0.08) 阴极材料。研究了掺杂 F 对正极材料 Li1.2Mn0.54Ni0.13Co0.13O2 的微观结构和电化学性能的影响。结果表明，在所有掺杂 F 的阴极材料中，晶格参数都得到了提高，层状结构的有序度和稳定性也得到了改善。当 x = 0.05 时，阴极材料 Li1.2Mn0.54Ni0.13Co0.13O1.95F0.05 （LMO-F0.05）的循环性能和速率性能最好，在 0.2 C 下循环 100 次后容量保持率为 87.7%，在 5 C 大功率下放电容量为 117 mAh g-1。由此可见，掺杂 F 是促进锂离子扩散和开发高性能层状阴极材料的一种简单而关键的策略。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

F-doping effects on microstructure and electrochemical performance of cathode material Li1.2Mn0.54Ni0.13Co0.13O2

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F-doping effects on microstructure and electrochemical performance of cathode material Li1.2Mn0.54Ni0.13Co0.13O2

Lithium-rich manganese-based (Li-rich Mn-based) cathode materials possess high specific capacity, low self-discharge rate and steady working voltage, but cycle performance and rate performance need to be further improved. In this study, cathode materials Li_1.2Mn_0.54Ni_0.13Co_0.13O_2-xF_x (x = 0, 0.02, 0.05, 0.08) are synthesized by the co-precipitation method with the two-step calcination process. And the F-doping effects on the microstructure and the electrochemical performance are investigated in the cathode materials Li_1.2Mn_0.54Ni_0.13Co_0.13O₂. The results indicate that among all the F-doped cathode materials, the crystal lattice parameters are increased, order degree and stability of the layered structure are improved. As for x = 0.05, cathode material Li_1.2Mn_0.54Ni_0.13Co_0.13O_1.95F_0.05 (LMO-F_0.05) shows the best cycle performance and rate performance with its capacity retention rate 87.7% after 100 cycles at 0.2 C and discharge capacity 117 mAh g⁻¹ at 5 C high power. It can be seen that F doping is a simple and crucial strategy to promote the Li ion diffusion and develop high performance layered cathode materials.

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来源期刊

Particuology 工程技术-材料科学：综合

CiteScore

6.70

自引率

2.90%

发文量

1730

审稿时长

32 days

期刊介绍： The word ‘particuology’ was coined to parallel the discipline for the science and technology of particles. Particuology is an interdisciplinary journal that publishes frontier research articles and critical reviews on the discovery, formulation and engineering of particulate materials, processes and systems. It especially welcomes contributions utilising advanced theoretical, modelling and measurement methods to enable the discovery and creation of new particulate materials, and the manufacturing of functional particulate-based products, such as sensors. Papers are handled by Thematic Editors who oversee contributions from specific subject fields. These fields are classified into: Particle Synthesis and Modification; Particle Characterization and Measurement; Granular Systems and Bulk Solids Technology; Fluidization and Particle-Fluid Systems; Aerosols; and Applications of Particle Technology. Key topics concerning the creation and processing of particulates include: -Modelling and simulation of particle formation, collective behaviour of particles and systems for particle production over a broad spectrum of length scales -Mining of experimental data for particle synthesis and surface properties to facilitate the creation of new materials and processes -Particle design and preparation including controlled response and sensing functionalities in formation, delivery systems and biological systems, etc. -Experimental and computational methods for visualization and analysis of particulate system. These topics are broadly relevant to the production of materials, pharmaceuticals and food, and to the conversion of energy resources to fuels and protection of the environment.