FeS2/RGO纳米复合材料的制备及热电池放电性能

doi:10.15541/jim20160493

摘要/Abstract

摘要：

以氯化亚铁、硫代硫酸钠和氧化石墨烯(GO)为原料, 采用水热法制备FeS₂/还原氧化石墨烯(RGO)纳米复合材料, 并采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、激光粒度分布仪和差热分析仪(DTA)等对FeS₂/RGO复合材料进行了表征。结果表明, 在水热反应过程中加入GO可以防止FeS₂颗粒的团聚, 使FeS₂形成疏松的球状颗粒。采用LiCl-KCl电解质, 在450℃以100mA/cm²电流密度放电时, 截止1.5 V时, FeS₂/RGO比容量为314.9 mAh/g, 较FeS₂高65.6 mAh/g; 采用LiF-LiCl-LiBr电解质, 在500℃以100 mA/cm²电流密度放电, 截止1.5 V时, FeS₂/RGO放电比容量为302.3 mAh/g, 较FeS₂高29.8 mAh/g。与FeS₂相比, 加入石墨烯提高了正极材料的导电性, 单体电池在放电过程中极化电阻相对较小, 使得FeS₂/RGO复合材料表现出较高的放电比容量。

关键词: 热电池, 正极材料, 水热法, FeS₂/RGO

Abstract:

FeS₂/reduced graphene oxide (RGO) composites were prepared through a facile hydrothermal method using FeCl₂, Na₂S₂O₃and graphene oxide(GO) as the starting materials. X-ray diffractometer (XRD), scanning electron microscope (SEM), laser particle size distribution analyzer, and differential thermal analyzer (DTA) were used to characterize the prepared nanocomposites. The results show that graphene oxide prevents the aggregation of FeS₂ particles during the hydrothermal synthesis, and make FeS₂ form loose spherical particles. FeS₂/RGO exhibits a high specific capacity of 314.9 mAh/g with a cut-off voltage of 1.5 V at constant current density of 100 mA/cm²and temperature of 450℃ in LiCl-KCl melt, which is 65.6 mAh/g higher than that of FeS₂. FeS₂/RGO exhibits a high specific capacity of 302.3 mAh/g with a cut-off voltage of 1.5 V at constant current density of 100 mA/cm²and temperature of 500℃ in LiF-LiCl-LiBr melt, which is 29.8 mAh/g higher than that of FeS₂. In contrast with FeS₂, the conductivity of the FeS₂/RGO cathode material is improved, the resistance of the single cell is relatively lower during discharge process, thus FeS₂/RGO cathode has a better battery discharge capacity.

Key words: thermal battery, cathode material, hydrothermal synthesis, FeS₂/RGO

中图分类号:

TM911

杨坤坤, 杨少华, 赵平, 赵彦龙. FeS₂/RGO纳米复合材料的制备及热电池放电性能[J]. 无机材料学报, 2017, 32(7): 691-698.

YANG Kun-Kun, YANG Shao-Hua, ZHAO Ping, ZHAO Yan-Long. Hydrothermal Synthesis of FeS₂/Reduced Graphene Oxide Nanocomposite with Enhanced Discharge Performance for Thermal Battery[J]. Journal of Inorganic Materials, 2017, 32(7): 691-698.

图/表 11

图1 GO, RGO, FeS2和FeS2/RGO的XRD图谱

Fig. 1 XRD patterns of GO, RGO, FeS2 and FeS2/RGO

图2 FeS2 和FeS2/RGO的SEM照片

Fig. 2 SEM images of FeS2 and FeS2/RGO(a, c) FeS2; (b, d) FeS2/RGO

图3 FeS2和FeS2/RGO的粒径分布

Fig. 3 Particle size distributions of FeS2 and FeS2/RGO

表1 FeS2和FeS2/RGO的粒径分布

Table 1 Particle size distributions of FeS2 and FeS2/RGO

Sample	D₁₀/μm	D₂₅/μm	D₅₀/μm	D₇₅/μm	D₉₀/μm
FeS₂	3.07	7.07	14.92	27.22	42.77
FeS₂/RGO	4.33	6.96	10.65	15.12	19.73

图4 石墨, GO和RGO的DTA曲线

Fig. 4 DTA curves of graphite, GO and RGO

图5 FeS2和FeS2/RGO的DTA曲线

Fig. 5 DTA curves of FeS2 and FeS2/RGO

图6 LiCl-KCl电解质和LiF-LiCl-LiBr电解质的DTA曲线

Fig. 6 DTA curves of LiCl-KCl eutectic electrolyte and LiF- LiCl-LiBr eutectic electrolyte

图7 采用LiCl-KCl电解质时, LiSi/FeS2和LiSi/(FeS2/RGO)单体电池的放电曲线

Fig. 7 Discharge curves of LiSi/FeS2 and LiSi/(FeS2/RGO) cells in LiCl-KCl eutectic electrolyte

图8 采用LiCl-KCl电解质时, LiSi/FeS2和LiSi/(FeS2/RGO)单体电池的内阻

Fig. 8 Resistance values of LiSi/FeS2 and LiSi/(FeS2/RGO) cells in LiCl-KCl eutectic electrolyte

图9 采用LiF-LiCl-LiBr电解质时LiSi/FeS2和LiSi/(FeS2/ RGO)单体电池的放电曲线

Fig. 9 Discharge curves of LiSi/FeS2 and LiSi/(FeS2/RGO) cells in LiF-LiCl-LiBr eutectic electrolyte

图10 采用LiF-LiCl-LiBr电解质时LiSi/FeS2和LiSi/(FeS2/ RGO)单体电池的内阻

Fig. 10 Resistance values of LiSi/FeS2 and LiSi/(FeS2/RGO) cells in LiF-LiCl-LiBr eutectic electrolyte

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FeS₂/RGO纳米复合材料的制备及热电池放电性能

Hydrothermal Synthesis of FeS₂/Reduced Graphene Oxide Nanocomposite with Enhanced Discharge Performance for Thermal Battery

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