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In this work, we have produced Cu/Sn/Cu sandwich structured film by electrodeposition method, to be used as a negative electrode for rechargeable lithium ion battery. To promote the interaction between Cu/Sn/Cu layers, an additional post-heat treatment (200°C, 48h under vacuum atmosphere) has been applied to the coatings. The galvanostatic test results prove that morphological changes and CuxSi intermetallics formation in the film as a result of heat treatment process promote the capacity retention of the electrode. After 30 cycle, the capacities of the Cu/Sn/Cu electrodes with and without heat treatments are 230 mAh g−1, 100 mAh g−1 respectively. This demonstrates that the post-heat treatment process improves cycle performance of the electrode.

This study is intended to present an efficient methodology for optimizing the anodic polarization process of 6xxx aluminum alloy to have high hardness. Additional electrochemical experiments have been conducted to observe the corrosion behavior of these oxide films. L9orthogonal array with four factors at three levelsareused. The type of additive, electrolyte temperature, current density and dissolved aluminum ions are chosen as parameters. The results show that the main parameters to increase the hardness of the oxide films are electrolyte temperature, additive type, dissolved aluminum ions and current density, respectively.