ChemInform Abstract: PHASE RELATIONSHIPS IN POSITIVE ELECTRODES OF HIGH TEMPERATURE LITHIUM‐ALUMINUM/LITHIUM CHLORIDE‐POTASSIUM CHLORIDE/IRON SULFIDE (FES2) CELLS

Abstract

Die Phasen in FeSz Elektroden, die in eutektische LICFKCI‐Schmelzen bei 400‐450°C betrieben wurden, sind metallographisch und durch Röntgenbeixgung untersucht worden.

Electrochemical verification of the redox mechanism of FeS2 in a rechargeable lithium battery

“…FeS 2 + Li 2 S nÀ1 (6) However, the above are only a hypothesis, and there is a need to support our hypothesis using experimental results.…”

“…For energy storage in lithium batteries, FeS 2 has a theoretical specific capacity of 894 Ah/kg based on the complete conversion of FeS 2 into metallic Fe and Li 2 S. The high specific capacity together with other merits, such as nontoxicity and cost effectiveness, make FeS 2 appealing and competitive in developing the next generation of batteries beyond Li-ion. In particular, the Li/FeS 2 primary battery operating at ambient temperature was already commercialized as early as the 1980's [5], and FeS 2 was proven to be highly reversible in rechargeable lithium batteries operated at high temperatures (375-500 C) [6,7]. Other publications have shown that Li/FeS 2 batteries are capable of being cycled up to 500 cycles in a moderate temperature range of 90-130 C by employing a composite polymer electrolyte [8][9][10].…”

Thermal activated (thermal) battery technology

“…This value is lower than the previous values (mean value: 13.7 × 10 −4 at 450 • C) in the LiCl-KCl eutectic. It was explained by the formation of the so-call "J-phase" (LiK 6 Fe 24 S 26 Cl) at a temperature below 470 • C described later by Tomczuk et al [130] arising from the reaction between FeS 1.14 and the molten chlorides [131,132]. The solubilities of Li 2 S, FeS 2 , and FeS 1.14 follow Arrhenius-type law.…”

Resilient carbon encapsulation of iron pyrite (FeS2) cathodes in lithium ion batteries

“…The overall lithiation process was found to consist of two steps: [14,15] FeS 2 þ 2Li þ þ 2e À /Li 2 FeS 2 (1)…”