Abstract
The compositional variation of the chemical diffusion coefficient in the six intermediate phases LiSn, Li 7Sn 3, Li 5Sn 2, Li 13Sn 5, Li 7Sn 2, and Li 22Sn 5 of the lithium-tin system at 415°C has been measured. Among these intermediate phases, the phase Li 13Sn 5 has the highest chemical diffusion coefficient, varying with composition from 5.01 × 10 −5 to 7.59 × 10 −4 cm 2/sec at that temperature. Combining this information with coulometric titration curves (emf versus composition), the self-diffusion coefficient of lithium has also been determined in the various intermetallic phases as a function of composition under the assumption that the tin atoms do not move appreciably compared with the lithium atoms. The lithium self-diffusion coefficient in the phase LiSn is lower than those in the more lithium-rich phases by one order of magnitude. This result is discussed in terms of the difference between the crystal structures of LiSn and the other lithium-rich phases in the lithium-tin system.
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