Starch-based hard carbon material and preparation method and application thereof

Abstract

The present application relates to a kind of starch-based hard carbon material and its preparation method and application, the preparation method includes the following steps: S1.starch is carried out pre-oxidation treatment, and pre-oxidized starch is obtained;S2.pre-oxidized starch in step S1 and high molecular polymer are mixed, and mixture is obtained;S3.mixture is carbonized, and carbonized material is obtained;S4.carbonized material is carried out high-temperature pore-making, and the starch-based hard carbon material is obtained;The high molecular polymer is at least one of polypropylene or polyacrylonitrile.The preparation method can effectively avoid the foaming and aggregation phenomenon of pre-oxidized starch by mixing pre-oxidized starch and specific high molecular polymer after carbonization and pore-making, so that the hard carbon obtained keeps good spherical structure, and then the first coulomb efficiency of sodium ion battery is improved.Simultaneously, the sodium ion battery prepared by the starch-based hard carbon material also has good cycle stability and rate performance.

Images