Method for preparing electrode material of lithium-ion-mixed capacitor and application thereof

Abstract

The invention relates to a method for preparing an electrode material of a lithium-ion-mixed capacitor. The method comprises: a water solution having ammonium ferrous sulfate and iminodiacetic acid is placed in a reaction still, reaction is carried out under a certain temperature, and a precursor Fe-IDA is generated; the precursor Fe-IDA is cleaned and dried and then is placed in a tube furnace with argon protection, an annealing experiment is carried out to obtain a negative electrode material Fe3O4@C; the negative electrode material is corroded in a dilute acid solution, thereby obtaining positive-material porous carbon; and the positive electrode, the negative electrode, and a diaphragm are arranged in a button battery, the button battery is placed into a lithium hexafluorophosphate solution as an electrolyte, and packaging is carried out to obtain a lithium-ion-mixed capacitor. According to the invention, the negative electrode material and the positive electrode material of the lithium-ion-mixed capacitor are prepared by one way, so that problems of long preparation time, high cost, and compatibility of capacities and volumes of the positive electrode and negative electrode can be solved. The prepared lithium-ion-mixed capacitor has advantages of wide operating voltage range, excellent performances, high energy density, and ultra-high power density.

Description

technical field [0001] The invention relates to a preparation method and application of an electrode material for a lithium-ion hybrid capacitor, and belongs to the technical field of batteries and supercapacitors. Background technique [0002] Due to the simultaneous use of the electrode materials of lithium-ion batteries and supercapacitors, lithium-ion hybrid capacitors have the dual characteristics of batteries and supercapacitors, and have the advantages of higher energy density than conventional supercapacitors and higher power density than lithium-ion batteries. At present, the positive electrode materials of lithium-ion hybrid capacitors commonly used are activated carbon, carbon nanotubes, graphene and other electric double layer capacitor materials, and the negative electrode materials are lithium titanate, metal oxides, graphite and other materials that can deintercalate lithium. However, the positive and negative electrode materials of the reported lithium-ion hy...

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Problems solved by technology

Fe in the hybrid capacitor 3 o 4 / Graphene composite materials first need to use the traditional Hummer method to prepare graphene oxide. The 3D graphene used needs to be carbonized by glucose and activated by potassium hydroxide. The steps are cumbersome and costly, and it is not suitable for large-scale industrial production.

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