Novel method of preparation of C/Sn-SnO_{2} nanocomposite Li-ion anode material derived from plant polysaccharides

摘要

C/Sn\ud-\udSnO\ud2\udnanocomposite was obtained in one step pyrolysis and carbore\udduction process, providing formation of tin\ud-\udbased \udnanograins encapsulated in carbon buffer matrix derived from plan\udt polysaccharide (potato starch). Electrical conductivity of t\udhe \udobtained material\udwas carried out within temperature range \ud-\ud20÷\ud40\ud ̊\udC.\ud Cyclic voltammetry (CV) and charge\ud-\uddischarge tests were \udpe\udrformed in Li/Li\ud+\ud/(C/Sn\ud-\udSnO\ud2\ud) R2032\ud-\udtype coin cells within 0.02\ud÷\ud1\ud.5\udV potential range. Furthermore\ud, \udelectrochemical \udimpedance spectroscopy (EIS) was used to characterize electrochemica\udl properties of the nanocomposite. The C/Sn\ud-\udSnO\ud2 \udanode \udmaterial\udprovided at least 538 mAh g\ud-1\udat C/20\ud–\udrate and revealed good coulombic efficiency and capacity retention in charge\ud-\uddischarge cell tests.