電解アルミニウム箔のリチウムイオン電池正極集電体への適用

概要

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We have developed aluminum (Al) foil using an electrodeposition technique (electrodeposited Al foil) in dimethylsulfone-based organic electrolyte solution. The electrodeposited Al foil was suitable for the current collector of lithium ion batteries (LIB) because of its high surface roughness and excellent wettability compared with those of conventional Al foil produced by rolling methods. The electrodeposited Al foil showed excellent electrochemical stability under anodically polarized conditions. These characteristics are attributed to the crystal orientation, the crystal structure and the composition of the electrodeposited Al foil. The electrochemical characteristic of the positive electrode using this Al foil was almost the same as that using conventional Al foil, while the resistance of the positive electrode using the electrodeposited Al foil was lower than that using conventional Al foil. These electrochemical characteristics are probably due to the above mentioned physical properties of the electrodeposited Al foil. These properties also influenced the cycle efficiency and/or cycle life of the battery under high rate conditions.