Electrochemical properties of nickel-precipitated pyrite as cathode active material for lithium/pyrite cell Choi, Y J; Kim, N W [i-Cube Center, ITRC for Energy Storage and Conversion, Gyeongsang National University, 900 Gazwadong, Jinju, Gyeongnam 660-701 (Korea, Republic of)]; Kim, K.W., E-mail: kiwonkim@gnu.ac.k [i-Cube Center, ITRC for Energy Storage and Conversion, Gyeongsang National University, 900 Gazwadong, Jinju, Gyeongnam 660-701 (Korea, Republic of)]; Cho, K K; Cho, G B; Ahn, H J; Ahn, J H [i-Cube Center, ITRC for Energy Storage and Conversion, Gyeongsang National University, 900 Gazwadong, Jinju, Gyeongnam 660-701 (Korea, Republic of)]; Ryu, K S [Department of Chemistry, University of Ulsan, Ulsan 680-749 (Korea, Republic of)]; Gu, H B [Department of Electrical Engineering, College of Engineering, Chonnam National University, 300 Yongbong-dong, Buk-ku, Kwangju (Korea, Republic of)] 36 MATERIALS SCIENCE; CATHODES; EFFICIENCY; ELECTROCHEMICAL CELLS; ELECTROCHEMISTRY; LITHIUM; NICKEL; OXIDATION; PLATING; PRECIPITATION; PYRITE; ALKALI METALS; CHEMICAL REACTIONS; CHEMISTRY; DEPOSITION; ELECTRODES; ELEMENTS; METALS; MINERALS; SEPARATION PROCESSES; SULFIDE MINERALS; SURFACE COATING; TRANSITION ELEMENTS ALKALI METALS; CHEMICAL REACTIONS; CHEMISTRY; DEPOSITION; ELECTRODES; ELEMENTS; METALS; MINERALS; SEPARATION PROCESSES; SULFIDE MINERALS; SURFACE COATING; TRANSITION ELEMENTS The effects of nickel precipitation and the cut-off voltage on the electrochemical properties of a pyrite cathode were investigated by using an electroless nickel-plating method. After nickel precipitation, some nickel particles that were precipitated on the surface of pyrite accumulated between the pyrite powder particles. In the voltage range of 0.4-3.2 V, a cell with nickel-precipitated pyrite exhibited a rapid decrease in discharge capacity and poor columbic efficiency. On the other hand, in the voltage range of 0.8-2.4 V, the cell showed an improved cycle life property and good coulombic efficiency because irreversible reactions below 0.8 V and sulfur oxidation above 2.4 V were suppressed by controlling the cut-off potential and the internal resistance was decreased by nickel precipitation. Available from http://dx.doi.org/10.1016/j.jallcom.2009.05.140 Netherlands 2009-10-19 English Journal Article Journal Name: Journal of Alloys and Compounds; Journal Volume: 485; Journal Issue: 1-2; Other Information: DOI: 10.1016/j.jallcom.2009.05.140; PII: S0925-8388(09)01133-5; Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved. Medium: X; Size: page(s) 462-466 https://doi.org/10.1016/j.jallcom.2009.05.140 [] 1-2 485 Journal ID: ISSN 0925-8388; JALCEU; TRN: NL10R1351119524 NLN 2012-12-21 21392101