FeS₂纳米颗粒/碳布的制备及其锂离子储存性能的研究

The Construction of FeS₂/CC Nanoparticles and Lithium-Ion Storage Properties

摘要: FeS₂是黄铁矿的主要成分，作为过渡金属硫族化合物的一员，其在锂离子电池应用方面有着巨大的潜力。然而，巨大的体积膨胀以及迟缓的动力学严重限制了其在电池中的应用。本文中，我们以碳布作为基底，通过水热以及硫化过程将FeS₂纳米颗粒与碳布紧密地结合在一起。将FeS₂/CC直接作为锂离子负极材料，不需要额外添加导电剂以及粘结剂，减少了容量的损失。并且碳布本身具有良好的导电性，可以提供巨大的空间，足以容纳FeS₂在循环过程中的体积膨胀，提高循环稳定性。所以，FeS₂/CC在200 mA g⁻¹以及500 mA g⁻¹的电流密度下分别循环100圈以及250圈后仍然可以维持着1376.5 mAh g⁻¹和1345.5 mAh g⁻¹的可逆容量，同时还具有优异的倍率容量，在2 A g⁻¹的电流密度下其放电容量维持在750.6 mAh g⁻¹。

Abstract: FeS₂ is the main component of pyrite. As a member of the transition metal chalcogenide, it has great potential in LIBs. However, huge volume expansion and slow dynamics severely limit its application in batteries. In this paper, we use carbon cloth as the substrate, and tightly combine FeS₂ nanoparticles on the carbon cloth through hydrothermal and vulcanization processes. FeS₂/CC is directly used as lithium-ion anode materials, no additional conductive agent and binder are needed, which reduces the loss of capacity. The carbon cloth has conductivity and huge space, which is enough to accommodate the volume expansion of FeS₂ during the cycle and improves cyclic stability. Therefore, FeS₂/CC can still maintain the reversible capacities of 1376.5 and 1345.5 mAh g⁻¹ at 200 and 500 mA g⁻¹ after 100 and 250 cycles, respectively. It has excellent rate capacity of 750.6 mAh g⁻¹ at a current density of 2 A g⁻¹.