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|1. (WO2017190417) METHOD FOR PREPARING THICK AND DENSE GRAPHENE-BASED ELECTRODE|
|Applicants:||GRADUATE SCHOOL AT SHENZHEN, TSINGHUA UNIVERSITY
|Title:||METHOD FOR PREPARING THICK AND DENSE GRAPHENE-BASED ELECTRODE|
Disclosed is a method for preparing a thick and dense graphene-based electrode. The method comprises the following steps for the preparation of a graphene hydrogel, compounding of the graphene and a salt component, gas formation and removal of the salt component, and preparation of the thick and dense graphene-based electrode. According to the method, a three-dimensional porous graphene block material is prepared by using the pore-forming effect of a gas-forming salt on a graphene network during heating. Compared with other pore-forming methods, the gas-forming salt does not etch the graphene during heating, the yield of the resulting graphene is high, and the method is suitable for mass production of porous graphene materials; the gas generated after heating is removed, and therefore, the resulting graphene has few impurities and a high purity; a small quantity of the remaining impurities occupy the pores of the graphene, and a secondary pore-forming effect is achieved on the graphene network after washing. The graphene is of a three-dimensional formed block structure and can be directly applied to an electrode material, the electrode has a higher thickness and a larger density, and the processing step of preparing an electrode from powdery graphene is also avoided.