Carbon‐coated natural graphite has been prepared by thermal vapor decomposition treatment of natural graphite at 1000°C. Natural graphite coated with carbon showed much better electrochemical performance as an anode material in both propylene carbonate‐based and ethylene carbonate‐based electrolytes than “bare” natural graphite. The effect of carbon coating on the electrochemical performance was investigated by solid‐state 7normalLi‐NMR in conjunction with standard electrochemical techniques. © 2000 The Electrochemical Society. All rights reserved.

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A novel spectroscopy technique based on modulated photoconductivity measurements with varying illumination level has been applied to investigate the capture coefficients and the energy distribution of defect states in undoped amorphous silicon. From the experimental data, charged and neutral defect distributions are clearly resolved according to their own capture coefficients. The carrier capture process as well as the defect formation mechanism are both quantitatively discussed.

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