Mesoporous gold as anode material for lithium-ion cells

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Journal Article
Journal of New Materials for Electrochemical Systems, 2007, 10 (2), pp. 95 - 99
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Mesoporous gold sponges were prepared by chemical removal of Al from thin films of an AuAl2 precursor that had been deposited on Cu sheet. The morphology of the Au was characterised by interconnected pores and channels of between 5 and 20 nm in diameter. Here we report an assessment of these films as the electrode in Li rechargeable cells. It was found that the Li alloying processes occurred in the voltage range of 0 to 0.25 V, while de-alloying occurred in two stages at about 0.15 and 0.45V. This is significantly lower than in the Li-Sn or Li-Sn-Cu systems (0.2-1.0V) but comparable to that reported for thin, solid gold anodes. Overall, a multilayer mesoporous Au film showed superior characteristics compared to an ordinary Au film, with a higher specific charge passed. Capacity of all electrodes tested was of the order of 500 mA.h.g-1 during the initial discharge cycle, but was subject to a steep fade during subsequent cycles. The capacity of the multilayer, mesoporous gold settled at about 80 mA.h.g-1 after 30 cycles, while that of the ordinary Au film fell to about 10 mA.h.g-1. © J. New Mat. Electrochem. Systems.
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