Study on the preparation and electrochemical properties of dual carbon composite materials
Phenolic resin is a common carbon precursor with low cost and rich carbon content.However,phenol-ic resin pyrolytic carbon is often characterized by a relatively high degree of structural regularity and small inter-layer spaces,resulting in poor electrochemical Zn-storage ability.Plant fiber derived carbon materials with hier-archical porous are highly desirable to achieve fast diffusion of electrolytes and enhance capacitor performance.Here,a carbon composite consisting of softwood fiber derived carbon and phenolic resin pyrolytic carbon was successfully prepared by wet papermaking technology and pyrolytic carbonization by using bleach softwood pulp as fiber raw material and phenolic resin powder as filler respectively.The obtained carbon composite was used as a self-supporting cathode material for zinc-ion hybrid capacitors.The results showed that the softwood fiber de-rived carbon endowed the electrode with higher specific capacity,and the phenolic resin pyrolytic carbon can im-prove the cyclic stability of the electrode.The assembled capacitor exhibited excellent rate performance and cy-cle stability.The initial specific capacity reached 101.0 mAh/g at the current density of 1 A/g.After 2 500 cy-cles,the specific capacity was 91.0 mAh/g and the capacity retention rate was 90％.
万方数据
维普
