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Juan Yu, Yinbo Wei, Bicheng Meng, Jiaxin Peng, Kai Yang, Tianxing Chen, Naixing Yang, and Xiuyun Chuan, Homogeneous distributed natural pyrite-derived composite induced by modified graphite as high-performance lithium-ion batteries anode, Int. J. Miner. Metall. Mater., 30(2023), No. 7, pp.1353-1362. https://dx.doi.org/10.1007/s12613-023-2598-5
Juan Yu, Yinbo Wei, Bicheng Meng, Jiaxin Peng, Kai Yang, Tianxing Chen, Naixing Yang, and Xiuyun Chuan, Homogeneous distributed natural pyrite-derived composite induced by modified graphite as high-performance lithium-ion batteries anode, Int. J. Miner. Metall. Mater., 30(2023), No. 7, pp.1353-1362. https://dx.doi.org/10.1007/s12613-023-2598-5
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改性石墨诱导均匀分布的天然黄铁矿衍生复合材料作为高性能锂离子电池负极

摘要: 天然矿物基能源材料由于具有材料一致性好、高产量、环境友好、成本低等优点,成为了近年来的研究热点。均匀的颗粒分布可以有效抑制活性物质的聚集,提高材料的锂存储性能。在这项工作中,通过聚乙烯吡咯烷酮对天然石墨进行改性,得到尺寸更小、分散性更好的改性石墨。进一步通过球磨工艺得到具有均匀颗粒分布的天然黄铁矿复合聚乙烯吡咯烷酮改性石墨(pyrite/PG )材料。随后的煅烧过程将pyrite/PG转化为与改性石墨复合Fe1−xS复合物(Fe1−xS/PG )。活性材料中材料的均匀分布可以加快电子的快速转移,促进活性材料的高效利用。所制备的Fe1−xS/PG电极,在在0.2 A·g−1电流密度下,经过80次循环后,可展现出613.0 mAh·g−1的可逆比容量。在倍率性能测试中,在5 A·g−1电流密度下,可展现出523.0 mAh·g−1的比容量。甚至在更高的10 A·g−1电流密度下,Fe1−xS/PG电极也能提供348.0 mAh·g−1的比容量。进一步研究发现,氧化还原反应中占主导地位的赝电容是优异的倍率和循环稳定性的原因。这项工作提供了一种低成本和简便的方法来制备高性能天然矿物基负极材料,并向读者介绍了均匀颗粒分布对锂存储性能的影响。

 

Homogeneous distributed natural pyrite-derived composite induced by modified graphite as high-performance lithium-ion batteries anode

Abstract: Natural minerals-based energy materials have attracted enormous attention because of the advantages of good materials consistency, high production, environmental friendliness, and low cost. The uniform distribution of grains can effectively inhibit the aggregation of active materials, improving lithium storage performance. In this work, natural graphite is modified by polyvinylpyrrolidone to obtain modified graphite with reduced size and better dispersion. Natural pyrite composite polyvinylpyrrolidone-modified graphite (pyrite/PG) material with uniform particle distribution is obtained by the ball milling process. The subsequent calcination process converts pyrite/PG into Fe1−xS compounded with polyvinylpyrrolidone-modified graphite (Fe1−xS/PG). The homogeneous grain distributions of active material can facilitate the faster transfer of electrons and promote the efficient utilization of active materials. The as-prepared Fe1−xS/PG electrode exhibits a remarkably reversible specific capacity of 613.0 mAh·g−1 at 0.2 A·g−1 after 80 cycles and an excellent rate capability of 523.0 mAh·g−1 at 5 A·g−1. Even at a higher current density of 10 A·g−1, it can deliver a specific capacity of 348.0 mAh·g−1. Moreover, the dominant pseudocapacitance in redox reactions accounts for the impressive rate and cycling stability. This work provides a low-cost and facile method to fabricate natural mineral-based anode materials and apprise readers about the impact of uniform particle distribution on lithium storage performance.

 

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