Electrochemical capacitors have the advantages of fast charging, high power, long cycle life, wide operating temperature range, high safety performance, etc., can be used as high-power power supplies, and have broad development in the fields of hybrid electric vehicles, backup power supplies, portable electronic equipment, etc. prospect. However, compared with batteries, electrochemical capacitors have a lower energy density, that is, the energy stored in a unit volume is lower, which limits their wider application range, especially in portable smart devices, and the volume energy density needs to be further improved. Recently, the Institute of Metal Research of the Chinese Academy of Sciences and the University College of London in the United Kingdom published an online title entitled "Research on the Electrochemical Capacitor Energy Storage of Graphene Thin Films with Adjustable Layer Interval and High-efficiency Pore" in Nature Energy the interlayer spacing of graphene laminate films for efficient pore-utilization towards compact capacitive energy storage).
The researchers prepared a mixed solution of graphene oxide and thermally reduced graphene in different proportions, which were vacuum filtered to obtain a composite graphene-based film with adjustable sheet spacing. By adjusting the spacing between the layers, the effect of optimizing the porosity of the entire electrode material is achieved. When the pore size of the electrode material matches the ion size of the electrolyte, the space utilization of the pores is optimized, thereby maximizing the volumetric energy density. On this basis, researchers have designed all-solid flexible electrochemical capacitors. The good bending performance of the graphene film electrode material itself guarantees the flexibility of the entire device, and further develops smart devices. By changing the circuit connection method according to actual needs To achieve different output effects.
The experimental work of this cooperative research was completed by Dr. Li Zhuangnan, a Ph.D. from University College London in the Institute of Metal Research, Chinese Academy of Sciences. All authors participated in data analysis, discussion and paper writing. Li Zhuangnan is the first author, and Li Feng, Ivan Parkin and Guo Zhengxiao are co-corresponding authors. The research work was supported by the National Natural Science Foundation of China, the National Key R & D Program, and the Chinese Academy of Sciences.
Figure 1. Preparation process of composite graphene film with adjustable interlayer spacing
Figure 2. Structural characterization of a composite graphene film with adjustable interlayer spacing
Figure 3. Electrochemical characterization of composite graphene films with adjustable interlaminar spacing
Figure 4. Performance of electrochemical capacitors
Figure 5. Making an all-solid electrochemical capacitor and its smart design
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