リチウム2次電池用負極としてのSnOべースガラスの作製とキャラクタリゼーション

概要

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Glasses in the systems of Li_2O-SnO-B_2O_3 and Li_2O-SnO-BPO_4 were prepared by a melt quenching method and their thermal, viscous, and electrochemical properties were investigated. The SnO based glasses exhibited the relatively low glass transition temperatures (T_g) of ≈350℃ and an excellent thermal stability against crystallization. The values of T_g and E_η/T_g, where E_η is the activation energy for viscous flow at around T_g and E_η/T_g is the fragility parameter, were maximized at around a composition of 40 mol% SnO in the SnO-B_2O_3 system. The electrochemical properties of those glasses were investigated by using a simple three-electrode cell with the glass as a working electrode, lithium sheets as both counter and reference electrodes, and 1M LiPF_6/EC+DEC as a liquid electrolyte. The SnO based glasses worked as anode materials with high discharge capacities over 650 mAh・g^<-1> at the first cycle and exhibited good cycling performance.
2001-12-01