Electrolyte Research Near Graphite Particles by the Feedback Current Using a Li Metal Probe

摘要

The paper reports a home-made Li metal probe (LMP) to explore Li ion transport near graphiteparticles using the feedback current by the tip generation-substrate collection (TG-SC) mode of ascanning electrochemical microscope. Cyclic voltammetry revealed sufficient reproducibility andcould measure the TG-SC feedback current over the charging graphite substrate. The graphite substrateat 0.0 V was imaged as hemi-spherical current domains ranging from ~mA to ~nA level according tothe position being scanned by the LMP at 0.0 V. These results are attributed to a difference in the+ intercalating ability of Li ions into the charging graphite particles and are depending on the workingsubstrate. Overall, electrolyte research using the feedback current near the anode particles is apromising method for improving the high rate performance of Li related batteries.