Preparation method of rare earth doped LiNi0.5 Mn1.5O4 as anode material for super capacitor

Abstract

The invention provides a preparation method of rare earth doped LiNi0.5 Mn1.5O4 as an anode material for a super capacitor. The preparation method comprises the following steps of: respectively taking compounds of Ni, Mn and Li according to the mole ratio that Ni to Mn to Li to rare earth is 1:3.0:(2.05-2.24):(0.003-0.02), adding the compounds of Ni, Mn and Li in a reaction pot and adding pure water to obtain a mixed solution A; based on a target product, respectively taking 6-30% of citric acid, 300-600% of pure water and 0.002-0.01% of dispersing agent, adding the citric acid and the dispersing agent to the pure water, and uniformly stirring; and then adding the rare earth to the aqueous solution of citric acid to obtain a solution B; adding the solution B to the solution A to obtain a solution C; adjusting the pH value of the solution C to 5-7, heating the solution C in a water bath manner to obtain a precursor; and putting the precursor in a metal container and carrying out microwave baking on the precursor to obtain the target product. According to the invention, the conductivity of LiNi0.5 Mn1.5O4 and the energy density of the super capacitor are improved greatly, the preparation process is simplified by adopting a microwave treatment technology, and thus the preparation method is easy for industrial implementation.

Description

technical field [0001] The invention relates to a preparation method of a supercapacitor positive electrode material, in particular to a supercapacitor positive electrode material rare earth doped LiNi 0.5 mn 1.5 o 4 method of preparation. Background technique [0002] The specific capacity of supercapacitors is 20~200 times that of ordinary capacitors, the specific power is usually greater than 1000W / kg, and the cycle life is greater than 10 5 It is a new type of energy storage device with high specific energy of batteries and high specific power of traditional capacitors, which can be charged and discharged quickly. [0003] In order to further increase the energy density of supercapacitors, a new type of capacitor—hybrid supercapacitors has been developed in recent years. In a hybrid supercapacitor, one pole uses conventional battery electrodes to store and convert energy through electrochemical reactions, and the other pole stores energy through an electric double la...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of low specific capacity and high cost of supercapacitor carbon materials in the prior art, and provide a supercapacitor positive electrode with low cost and energy consumption, high charge and discharge capacity, and high specific power MaterialLiNi 0.5 mn 1.5 o 4 preparation method

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