Study of High Energy Ball Milling for Preparation of Niobium Suboxide Anode Material for New Electrolytic Capacitor AITranslate

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Chinese Library Classification Number:TB34[一般工业技术—材料科学与工程]

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Study is made of the preparation of niobium suboxide by Nb reduction of Nb2O5 through high energy ball milling. The following two different processes were studied and compared： A. high energy ball mill mixing - acid pickling for impurity removal - vacuum masting; B. high energy ball mill mixing- vacuum, roasting- acid pickling for impurity removal. Analysis is made by ICP and SEM of the impurity content and microscopic morpholcgy of the product. Anode is prepared from niobium suboxide and its electrical property is tested with processes similar to those for tantalum electrolytic capacitor. The resuls show that product prepared by Alternative A is characterized by lower impurity content, less leakage current, lower specific capacity and loss than that by Alternative B, which has specific capacity up to 107 000μF·V·g^-1; the particle size of product by high energy ball milling is fine, and inclined to slice. The entrapped impurity during ball milling is hard to be thoroughly removed in the subsequent washing step, resulting in large leakage current of the anode.