Led by Prof. Chu Fuxiang, the research team from the Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, used a one-step method to prepare silver-lignin nanoparticles with good dispersion stability, and introduced them into the polyacrylamide network to obtain a lignin-based hydrogel with excellent self-adhesion and mechanical strength. The mechanical strength of lignin-based hydrogel is better than that of existing polyacrylamide hydrogel, with a tear energy of 902J/m2; at the same time, lignin-based hydrogel has strong self-adhesive properties and can adhere various materials. Based on the lignin gel matrix, a gel electrode and a gel electrolyte were prepared. The assembled all-gel supercapacitor has excellent electrochemical stability and mechanical stability, and the electrode-electrolyte interface adhesion strength is 827J/m2. The equivalent series resistance is 24.15Ω. After 5000 times of different mechanical deformations, its capacitance retention rate exceeds 90%. This research improves the interface problem of adjacent layers slipping or even falling off during the deformation process of flexible supercapacitors to a certain extent, expands the application scope of flexible supercapacitors, and is of great significance for realizing high-value utilization of lignin. Relevant results were published in Chemical Engineering Journal.

Preparation of lignin gel matrix