Li/CPE/FeS2 rechargeable battery

E. Peled*, D. Golodnitsky, E. Strauss, J. Lang, Y. Lavi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

87 Scopus citations

Abstract

A Li/Composite polymer electrolyte(CPE)/FeS2, 10 μ-thick-cathode battery had a cathode reversible capacity of 625 mAh/g (2.8 e/FeS2), which is five times that of the LixCoO2 cathode (120 mAh/g). The theoretical energy density of the Li/FeS2 couple, based on 2.8 e/FeS2 and on an average voltage of 1.6 V, is close to 860 Wh/kg, which is almost twice that of the Li/LiCoO2 cell. For 45 μ-thick cathodes, 3.9 mAh/cm2 reversible capacity was achieved. On the basis of this value, the projected specific energy for a bipolar Li/CPE/FeS2 battery is 170 Wh/kg and 250 Wh/kg is the long-term projection value. The effect of binders (such as PEO, PVDF, PBD, polystyrene, polycarbonate resin) and operating conditions on performance, cycle life and thermal characteristics of thin FeS2-based composite cathodes at 130°C were studied. In most cases, composite LiI-P(EO)n-Al2O3 polymer electrolytes were used. It was found that 100% first discharge utilization was achieved in PEO and PVDF-bound cathodes. The degradation rate at i>0.3 mA/cm2 did not exceed 1.5% per cycle for most of the cathodes under investigation. An extension of the end of the charge voltage from 2.25 to 2.4 V was followed by an overcharge protection mechanism. Replacement of I- by imide yielded very similar (almost identical) charge-discharge curves indicating that LiI is an "inert" electrolyte and is not involved in the cathodic reactions. DSC and TGA DTA thermograms exhibit full compatibility of pyrite with the polymer electrolyte and a high thermal stability of the composite cathode and the Lil-based polymer electrolytes.

Original languageEnglish
Pages (from-to)1593-1599
Number of pages7
JournalElectrochimica Acta
Volume43
Issue number10-11
DOIs
StatePublished - 30 Apr 1998

Funding

FundersFunder number
Belfer Foundation
Ministry of Energy
Ministry of Defense

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