Galvanostatic Characteristics of FeS2 in Electrolytes Based on Mixing DMC-LiAn

Abstract

UDC 541.135.3+541.135

The specific capacitance of the natural pyrite FeS₂ was investigated by the galvanostatic cycling method. The investigation was carried out in electrolytes consisting of dimethylcarbonate (DMC) and a lithium salt (LiBF₄, LiClO₄, or LiN(CF₃SO₂)₂). It was shown that the specific capacitance of FeS₂ and its stability during cycling depend on the concentration and the nature of the lithium salt anion. The best efficiency of FeS₂ during cycling is achieved in the electrolytes of DMC – LiClO₄ and DMC – LiN(CF₃SO₂)₂, at the salt concentration in the range of 0.1–0.2 molar proportion.

Keywords: specific capacitance of pyrite, electrolytes, specific conductivity, dimethylcarbonate, cycling.