Abstract：A convenient and practical technique to prepare TEM thin foil containing particles have been presented. First, particles were entrapped into copper electroplating coat by composite electroplating. Second, the composite coating was thinned by twin-jet electropolishing or ion-thinning, then the particles in it were thinned simultaneousely. In this study nonconducting LiCoO2 and conducting WC were entrapped. Select proper current density to obtain composite coating in which the particles were as many as possible and were entrapped tightly. Select proper pH-value of electrolyte to obtain composite coating which had moderate brittleness. Select proper stirring velocity to entrap smaller particles into composite coating.
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