期刊
SOLID STATE IONICS
卷 159, 期 3-4, 页码 233-240出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0167-2738(02)00908-6
关键词
pyrite; iron sulfide; gelatin; lithium
We have studied the electrochemical behavior of natural pyrite (FeS1.9, n-type semiconductor) treated nonaqueously with dimethylsulfoxide (DMSO) solvent and also with a gelatin/DMSO solution. Composite electrodes (comprised of pyrite, polyvinilidene fluoride, polyethylene oxide and carbon) were characterized in a lithium cell at room temperature by cyclic voltammetry and galvanostatic measurements; the electrolyte used was LiPF6 in a solution of ethylene carbonate and dimethyl carbonate (1 mol 1(-1)). The gelatin/DMSO treatment greatly improved the reversible specific capacity of a pyrite electrode. For galvanostatic discharge/charge at a current density of 0.4 mA cm(-2) and between voltage limits of 3.2 and 1.1 V, its reversible specific capacity at the 15th cycle equaled 275 mA h g(-1), an impressive value compared to less than 25 mA h g(-1) for a pristine pyrite electrode. (C) 2002 Elsevier Science B.V. All rights reserved.
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