Electrochemical Properties for Co-Doped Pyrite with High Conductivity

Abstract

Abstract:In this paper, the hydrothermal method was adopted to synthesize nanostructure Co-doped pyrite (FeS2). The structural properties and morphology of the synthesized materials were characterized using X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. Co in the crystal lattice of FeS2 could change the growth rate of different crystal planes of the crystal particles, which resulted in various polyhedrons with clear faces and sharp outlines. In addition, the electrochemical performance of the doping pyrite in Li/FeS2 batteries was evaluated using the galvanostatic discharge test, cyclic voltammetry and electrochemical impedance spectroscopy. The results showed that the discharge capacity of the doped material (801.8 mAh·g) with a doping ratio of 7% was significantly higher than that of the original FeS2 (574.6 mAh·g −1 ) because of the enhanced conductivity. Therefore, the doping method is potentially effective for improving the electrochemical performance of FeS2.

Origin of Ferromagnetism in Pure and Ion Doped Pyrite FeS2 Nanoparticles

“…To that aim we have taken additively the following model parameters which are appropriate for bulk CoS 2 : J 2 = 20.93 K, J 3 = 2.5 K, K, T c = 130 K, S = 1/2, and z = 6. As before the evaluation is performed at a temperature T = 100 K. The Co 2+ ions occupy Fe 2+ sites in the FeS 2 crystal lattice . The ionic radius of the doped Co 2+ ion is with 88 pm larger to that of the host Fe 2+ ion with 74 pm.…”

Hydrothermal Monodisperse Microspherulite Pyrite: Novel Synthesis Process and Electrochemical Study of Its Oxidation

“… 5 , 6 Due to its low fabrication cost and high electric power conversion efficiencies, 7 pyrite has become a promising semiconductor material for photovoltaic solar cells, which directly convert solar energy into electricity. Other novel applications of pyrite include cathode materials for lithium-ion batteries 8 and catalysts for clean energy H 2 production. 9 Pyrite oxidation also attracts research attention because pretreatment of refractory gold-bearing pyrite ore is essential to improving gold leaching efficiency.…”

An Electrospun Core–Shell Nanofiber Web as a High‐Performance Cathode for Iron Disulfide‐Based Rechargeable Lithium Batteries

“…[9][10][11] Its non-toxic nature and abundance at low cost (% US$ 0.5 kg À1 ,c ompared with US$ 30-80 kg À1 for lithiated metal oxides) are added advantages. [13,16] Recent research and development efforts to enhancet he electrochemical properties of FeS 2 have been mainly focused on fabricating porous structures, [8,17] utilizingc onductive carbons such as graphene, [18][19][20][21][22] introducing transition metal dopants, [23][24][25] and employing carbon or polymer matrices for effective active materiale ncapsulation. Moreover,w hen FeS 2 reacts with four Li + ions to produce Li 2 S, the polysulfide products generated tend to dissolve in the organic electrolyte and give rise to the redoxs huttle phenomenon, as in the case of lithium-sulfur batteries, resulting in severe capacity fading.…”

“…[12][13][14][15] Furthermore, huge volume changes ( % 164.2 %) and continuous aggregation of Fe particles that occur upon cycling accelerate capacityd egradation in FeS 2 electrodes. [13,16] Recent research and development efforts to enhancet he electrochemical properties of FeS 2 have been mainly focused on fabricating porous structures, [8,17] utilizingc onductive carbons such as graphene, [18][19][20][21][22] introducing transition metal dopants, [23][24][25] and employing carbon or polymer matrices for effective active materiale ncapsulation. [7,[26][27][28][29][30][31][32] Alternative electrolytes with reduced solubility of polysulfides and improved interfacial compatibility with lithium metal anodesh ave also been investigated in detail.…”