In situ 119Sn Mössbauer spectroscopy study of Sn-based electrode materials

Sn-based composite materials were synthetized by a conventional meltquenching method, and studied by X-ray diffraction, electrochemistry and in situ 119Sn Mosssbauer spectroscopy. Tin was dispersed ex situ into a matrix formed from B2O3:P2O5. XRD and 119Sn Mossbauer spectroscopy show the formation of an interface between the active species (Sn0) and the matrix. This amorphous interface acts as a “buffer-zone” which compensates volume changes during the tin-lithium alloy formation and avoids aggregation of tin particles.