Abstract
Electrochemical behavior and accompanying structural changes of Li 2CuO 2 and LiCuO 2 were examined. Lithium cupric oxide Li 2CuO 2 was oxidized to LiCuO 2 via two two-phase reactions. One-dimensional [CuO 4] chains in Li 2CuO 2 were maintained during the lithium extraction and insertion processes. When the Li 2− x CuO 2 electrode was cycled at 0.5 mA cm −2, a rechargeable capacity of 130 mAh g −1 was obtained with an average voltage of 2.5 V. Lithium extraction from LiCuO 2 lead to a production of CuO and oxygen. Lithium insertion into NaCuO 2 resulted in a new phase formation of LiNaCuO 2.
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