Preparation method of super large lamella RGO loaded ultrafine beta-FeOOH nanometer particle lithium ion battery negative electrode material

Abstract

The invention discloses a preparation method of a super large lamella RGO loaded ultrafine beta-FeOOH nanometer particle lithium ion battery negative electrode material. The preparation method comprises following steps: oxidized graphene is dispersed in deionized water so as to obtain a suspending liquid A; a certain amount of a soluble salt, sodium chloride, and urea are added into absolute ethylalcohol and deionized water, and then are mixed with the suspending liquid A so as to obtain a suspending liquid B; the suspending liquid B is introduced into a homogeneous hydro-thermal reaction vessel, the homogeneous hydro-thermal reaction vessel is sealed, and is introduced into a homogeneous hydro-thermal reaction equipment for hydro-thermal reaction, and then natural cooling to room temperature is carried out so as to obtain a product C; the product C is washed with water and alcohol respectively; and after washing, the product is dispersed in water so as to obtain a product D; the product D is subjected to freeze-drying so as to obtain the super large lamella RGO loaded ultrafine beta-FeOOH nanometer particle lithium ion battery negative electrode material. According to the preparation method, graphene combination and particle size reduction are adopted to improve the performance of beta-FeOOH, so that more electrochemical active sites and ion transmission channels are provided, battery reversible capacity is increased, the reversible capacity at 5000mA g<-1> is larger than 1000mAh g<-1>, and the potential capacity of the super large lamella RGO loaded ultrafine beta-FeOOHnanometer particle lithium ion battery negative electrode material is excellent.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, in particular to a method for preparing a superfine β-FeOOH nanoparticle lithium-ion battery negative electrode material loaded with ultra-large sheet RGO. Background technique [0002] Lithium-ion battery anode materials are an important part of lithium-ion batteries, and the composition and structure of anode materials have a decisive impact on the electrochemical performance of lithium-ion batteries. Most transition metal complexes have high theoretical specific capacity, and the discharge potential platform is between 1.0 and 2.0V; as lithium-ion battery anode materials, the reaction mechanism of transition metal complexes is different from that of graphite materials or Sn , The alloying reaction of Si-like materials is a reversible redox reaction. [0003] Due to the natural abundance and non-toxicity of iron, iron-based transition metal oxide materials have been promising anode ma...

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Problems solved by technology

Zhang Meng et al. (Journal of Alloys and Compounds, 2015, 648, 134-138) used ferric chloride and urea as reactants to react under hydrothermal conditions at 80°C for 4 hours to obtain FeOOH. The conductivity of the material is poor, and the specific capacity needs to be further improved; Zhai Yanjun et al. (Journal of PowerSources, 2016, 327, 423-431) used ferric chloride and cerium nitrate as raw materials, PVP, etc. as surfactants, doped Ce on FeOOH, but its -1 The reversible capacity at current density is only 830mAh g -1 , battery performance needs to be further improved

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