Oxidized CoSn nanoparticles as longlasting anode
For the preparation of CoSn based NPs, Sn NPs ( mmol) were ballmilled for 4 hours with Co NPs ( mmol) at a frequency of 30 s 1 using a Fritsch Pulverisette 23 mill (10 mL ZrO 2 vessel, loaded with two 10 mm ZrO 2 balls). In order to prepare crystalline CoSn 2 NPs, the vessel was loaded and sealed under nitrogen atmosphere.