Abstract
ntermetallic copper-tin compound (Cu6Sn5), acting as a negative electrode, is able to be intercalated and deintercalated by lithium ions during charging and discharging of a rechargeable lithium ion battery made of this intermetallic. Single Cu6Sn5 phase powders were successfully prepared by water-atomization of Cu-Sn alloys with subsequent heat treatment of the water-atomized powders. Although forming of the Cu6Sn5 intermetallic powders into applicable electrode structures can be produced by using some binders to hold the Cu6Sn5 powder particles to form a desired shape, the binder formulations are complicated and unrevealed. In our approach, we employed a thermal spraying technique to form a porous Cu6Sn5 intermetallic layer on a Cu plate. The porous Cu6Sn5 intermetallic layer was aimed to perform Li insertion and reversible extraction functions and the Cu plate to perform electron collector and supplier functions. It was found that the thermal spraying technique was able to form Cu6Sn5 intermetallic electrode structure. The coating layers produced under suitable spraying conditions contained Cu6Sn5 as a major phase.
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