LIGNIN MODIFICATION FOR BIOPOLYMER/CONJUGATED POLYMER INTERPENETRATING NETWORKS AS RENEWABLE ENERGY STORAGE MATERIALS

摘要

High cost or barely satisfactory performance is one of thencrucial drawbacks of the present materials used for storage ofnintermittent energy. Novel materials and systems are needed to bencheap, efficient and to come from easily accessible and renewablensources. To meet these demands, interpenetrating networks withnnatural biopolymer combined with synthetic conjugated polymernhave recently been designed and investigated for storage of electricalnenergy. In principle, the biopolymers used contain a large amount ofnphenol groups, which could be coverted to quinone groups bynoxidation to store charges. Among different biopolymers, lignins arencheaply and abundantly available as paper process byproducts. Also,nlignins were found containing a large amount of phenolic units andnthus a high charge storage density (ca.80mAh/g) could be obtained1.nFurthermore, the lignin charge storage perfomance was foundnvarying with lignin source and history in terms of the wood speciesnand the pulping process.