Preparation and lithium storage performance of rice-like core-shell FeS2/C nanoparticles

doi:10.11949/0438-1157.20201507

Abstract

Abstract:

The rice grain-like FeS₂/C nanomaterial with core-shell structure was prepared by anion displacement reaction. The prepared composite shows enhanced inoic and electronic conductivity, excellent electrolyte infiltration characteristics, and capability of buffering the volume change. When evaluated as anode of lithium ion batteries, the FeS₂/C electrodes exhibit high reversible capacity of 1100 mA·h·g^-1 at 100 mA·g^-1 and outstanding rate capability. Even at high current density of 2 A·g^-1, a reversible capacity of 866 mA·h·g^-1 can be achieved. The results in this paper provide new ideas and methods for the preparation of other core-shell materials.

Key words: lithium ion batteries, iron disulfide, core-shell structure, nanomaterials, composites, electrochemistry

摘要：

通过阴离子置换反应制备出具有核壳结构的米粒状FeS₂/C纳米材料。所制备材料具有较高的离子和电子电导，优异的电解液浸润特性，以及缓冲材料体积变化的能力。在作为锂离子电池负极材料时，FeS₂/C电极具有较高的可逆比容量以及优秀的倍率性能，100 mA·g^-1电流密度下可逆比容量高达1100 mA·h·g^-1，在2 A·g^-1的大电流密度下，依然有866 mA·h·g^-1可逆比容量。研究结果为其他核壳材料的制备提供了新的思路和方法。

关键词: 锂离子电池, 二硫化铁, 核壳结构, 纳米材料, 复合材料, 电化学

CLC Number:

TQ 152

XIA Qing, XU Yuxing, ZHOU Yuncheng, JI Xueqian, FENG Hailan, WANG Pengfei, TAN Qiangqiang. Preparation and lithium storage performance of rice-like core-shell FeS₂/C nanoparticles[J]. CIESC Journal, 2021, 72(5): 2849-2856.

夏青, 徐宇兴, 周运成, 纪雪倩, 冯海兰, 王鹏飞, 谭强强. 核壳结构米粒状FeS₂/C纳米材料制备及储锂性能研究[J]. 化工学报, 2021, 72(5): 2849-2856.

Figures/Tables 8

Fig.1 XRD patterns of the as-prepared FeS2/C composite and pure FeS2

Fig.2 Raman spectrum of the FeS2/C composite

Fig.3 TGA result of FeS2/C sample under air atmosphere

Fig.4 FESEM images of the precursor (a), FeS2 sample (b), and FeS2/C sample (c); TEM images of FeS2/C sample[(d)—(f)]

Fig.5 Schematic illustration of the formation process for rice-like FeS2/C composite

Fig.6 CV curves and charge-discharge profiles for FeS2/C electrode

Fig.7 Cycling performance of FeS2/C and FeS2 electrodes(a); Rate capability of FeS2/C electrode(b)

Fig.8 Nyquist plots of FeS2/C and FeS2 electrodes

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Preparation and lithium storage performance of rice-like core-shell FeS₂/C nanoparticles

核壳结构米粒状FeS₂/C纳米材料制备及储锂性能研究

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