Abstract
The electrochemical insertion properties and safety characteristics of the alternative Li-ion positive electrode material, lithium iron sulfide (Li 2FeS 2) are presented. The active material is synthesized by a low cost, proprietary solid-state method. In terms of specific energy, the Li 2FeS 2 material offers a significant advantage over conventional lithium-ion positive electrode materials. The fully de-lithiated (charged) Li 2− x FeS 2 phase also demonstrates outstanding thermal stability suggesting that it may represent an excellent choice for safe, large format Li-ion battery applications.
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