Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 5, Issue 6, Pages 480-483Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/S1388-2481(03)00110-3
Keywords
copper phosphide; ballmilling synthesis; reversibility; insertion anode; lithium-ion batteries
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Copper phosphide (CuP2) and lithium copper phosphide (Li1.75Cu1.25P2) were synthesized by high-energy ballmilling at room temperature. The electrochemical reactions between lithium and these samples have been studied. The first lithium insertion into the CuP2 phase till 0.0 V vs. Li leads to copper reduction and the formation of lithium phosphide (Li3P), corresponding to a long voltage plateau. The subsequent lithium extraction until 1.3 V vs. Li presents three voltage plateaus related to the formation of new phases such as Li2CuP, giving a reversible capacity about 810 mAh/g and faradic yield about 61%. It means that both copper and phosphorus face a change of the oxidation state for the electrochemical insertion and extraction. Lithium copper phosphide exhibits a similar reaction process. However, it provides a reversible capacity of 750 mAh/g and faradic yield of 100% at the first cycle. (C) 2003 Elsevier Science B.V. All rights reserved.
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