Mixing device for potassium-based battery and supercapacitor and preparation method thereof

Abstract

The invention discloses a mixing device for a potassium-based battery and a supercapacitor and a preparation method thereof. The method includes the following steps: preparing a negative electrode: namely a step of mixing and dissolving a negative electrode carbon material with carbon black and CMC in a certain weight ratio in a mixed solution of water and ethanol, stirring uniformly and then applying slurry to current collector copper foil, and performing annealing treatment in a vacuum environment at 60 DEG C-90 DEG C for 15-20 h; preparation a positive electrode: namely a step of mixing anddissolving a positive electrode carbon material with the carbon black and PVDF in a certain weight ratio in NMP, stirring uniformly and then applying the slurry to current collector aluminum foil, and performing the annealing treatment in a vacuum atmosphere at 60 DEG C-90 DEG C for 15-20 h; and preparing an electrolyte: namely a step of allowing the electrolyte to be a potassium-based salt electrolyte, and enabling positive ions in the electrolyte to be embedded in the negative electrode carbon material when the negative electrode is charged, and to be removed from the negative electrode carbon material during discharging; and enabling negative ions in the electrolyte to perform underpotential deposition when the positive electrode is charged, and enabling the negative ions to be adsorbed in the positive electrode carbon material and to be desorbed from the positive electrode carbon material during discharging.

Description

technical field [0001] The invention relates to the technical fields of potassium ion batteries and supercapacitors, in particular to a potassium-based battery supercapacitor mixing device and a preparation method thereof. Background technique [0002] Clean energy has led to the rapid development of large-scale energy storage devices with the advantages of low cost, environmental protection and abundance. Due to the high cost and the depletion of lithium resources, the further development of lithium-ion batteries is seriously hindered; therefore, various metal-ion batteries such as sodium-ion batteries (SIB), potassium-ion batteries (PIB), aluminum-ion batteries (AIB), magnesium-ion batteries (MIB), and supercapacitors (SCs) have been fully explored as alternatives to lithium-ion batteries (LIBs), according to the standard electrode potentials Li (-3.04V vs E0), Na (-2.71V vs E0), K (-2.93 V vs. E0), Al (-1.66V vs. E0) and Mg (-2.37V vs. E0), compared with SIB, AIB and MIB...

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Problems solved by technology

[0004] In order to solve the poor cycle stability and limited power density of current potassium-ion full batteries, and the low energy density of existing supercapacitors, the invention provides a potassium-based battery-supercapacitor hybrid device and a preparation method thereof. Methods include:

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