文摘
Herein, a new and facile synthesis of a tin-carbon nanocomposite and its electrochemical characterization is presented. Tin nanoparticles were embedded in micron-sized carbonaceous particles, thus successfully preventing the aggregation of tin nanoparticles and buffering the occurring volume strain, which accompanies the reversible (de-)alloying process. Such active material presents specific capacities of around 440 and 390 mAh g鈭? for applied specific currents of 0.1 and 0.2 A g鈭?, respectively, as lithium-ion anode using environmentally friendly and cost-efficient carboxymethyl cellulose as binder. Even more remarkably, at very high specific currents of 2, 5, and 10 A g鈭?, electrodes based on this composite still offer specific capacities of about 280, 240, and 187 mAh g鈭?, respectively. In addition, this tin-carbon nanocomposite appears highly promising as anode material for sodium-ion batteries, showing very stable cycling performance in a suitable potential range, and specific capacities of more than 180, 150, 130, and 90 mAh g鈭? for an applied specific current of 12.2, 122, 244, and 610 mA g鈭?, respectively, thus highlighting the high versatility of this composite active material for both Li-ion and Na-ion battery technologies.