Synthesis and Characterization of Sn-Coated SFG10 Graphites as NegativeElectrodes in Li-Ion Cells

摘要

A Sri-coating study was undertaken with a commercial graphite, Timcal SFG1O,using an electroless deposition process. The purpose of the work was to increase the reversible capacity and reduce the irreversible losses associated with this material when used as a negative electrode in Li-ion cells. The electrochemical performance of the Sri/C composite materials was improved over that for the bare (uncoated) graphite up to a Sn level of 15V0when tested at rates between C/l 5 and 2C. The overall irreversible losses were greatly reduced under the same conditions, Corroboration of the improved performance was obtained through cyclic voltametric experiments and by complex-impedance spectroscopy.