Lix(Al0.8Zn0.2) alloys as anode materials for rechargeable Li-ion batteries

The influence of the lithium content in the starting composition, depth of discharge, binder and electrolyte on the cycle stability was investigated. The structural changes in Lix(Al0.8Zn0.2) electrodes during electrochemical lithium extraction and reinsertion were studied by in situ synchrotron diffraction. The crystal structure of the new compound Li4Al3.42Zn11.58 was determined by single-crystal X-ray diffraction and can be described as combination of the CaCu5 and MgFe6Ge6 structure types. The phase equilibria at 150 °C in the Li–Al–Zn system were investigated on six alloys, prepared along the lithium extraction–insertion line.