| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for conveniently evaluating the dispersibility of an active material. SOLUTION: In the method for evaluating a surface characteristic regarding the battery active material using a liquid crystal field as a probe, a conductive auxiliary agent and a solvent, the active material is dispersed and mixed with a liquid crystal material to prepare an active material or carbon conductive auxiliary agent-liquid crystal mixture. A cell has two electrodes counter to each other through a predetermined gap and is filled with the active material-liquid crystal mixture. A sweep voltage component Vo changed at a sweep speed R (V/s), and a signal voltage superimposed on the sweep voltage component and combined with an AC component having a frequency f and a peak-peak amplitude Vp-p are applied between two counter electrodes in the cell. A current corresponding to the sweep voltage component of the signal voltage or a complex admittance, and a phase difference between a current and a voltage are measured. COPYRIGHT: (C)2011,JPO&INPIT
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