用于增强锂离子电池电化学性能的尖晶石锰酸锂正极材料的液态燃烧合成技术

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-07-12 DOI:10.4314/bcse.v38i5.18

Yu Sun, Chaofan Li, Hongcheng Gao, Jiaming Li, Jiabin Hao

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引用次数: 0

摘要

在 600、750 和 850 ℃ 下，通过简便的液体燃烧法合成了一种具有纳米尺度的立方尖晶石锰酸锂阴极材料。利用 X 射线衍射（XRD）、扫描电子显微镜（SEM）和透射电子显微镜（TEM）技术对锰酸锂电极的晶体结构和表面形貌进行了表征。样品的平均直径为 200 nm，具有高结晶度的八面体结构。由于结构优异，在 750 ℃ 下制备的样品首次放电容量最高，达到 115.3 mAh-g-1，在 1 C 下循环 400 次后容量保持率为 101.5 mAh-g-1；此外，在 55 ℃ 下也表现出良好的循环性能，循环 282 次后容量保持率为 71.2%，仍有 105.4 mAh-g-1。八面体锰酸锂的简单合成为锂离子电池的实际应用提供了一种策略。关键词：尖晶石锰酸锂、液体燃烧法、锂离子电池 Bull.Chem.Soc.2024, 38(5), 1429-1437. DOI: https://dx.doi.org/10.4314/bcse.v38i5.18

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Liquid-combustion synthesis of spinel LiMn2O4 cathode material for enhanced electrochemical performance lithium-ion batteries

A cubic spinel LiMn2O4 cathode material with nanoscale was synthesized via a facile liquid-combustion method at 600, 750 and 850 ℃. The crystal structure and surface morphology of LiMn2O4 electrodes have been characterized by using X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) technique. The samples have an average diameter of 200 nm with an octahedral structure with high crystallinity. Benefiting from the excellent structure, the sample prepared at 750 ℃ delivers the highest first discharge capacity of 115.3 mAh·g−1 with remaining 101.5 mAh·g−1 after 400 cycles at 1 C. Moreover, it exhibits a good cycling performance at 55 ℃, still had the capacity of 105.4 mAh·g−1 with a capacity retention of 71.2% following 282 cycles. The facilely synthesized octahedral LiMn2O4 provides a practical application strategy for lithium-ion batteries. KEY WORDS: Spinel LiMn2O4, Liquid-combustion method, Lithium-ion batteries Bull. Chem. Soc. Ethiop. 2024, 38(5), 1429-1437. DOI: https://dx.doi.org/10.4314/bcse.v38i5.18

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.