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

A lithium-ion battery and nanoparticle technology, which is applied in the field of electrochemistry, can solve the problems of further improvement of specific capacity and poor conductivity, and achieves the effects of easy implementation, improved conductivity and low cost.

Active Publication Date: 2019-02-26
SHAANXI UNIV OF SCI & TECH
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  • Description
  • Claims
  • Application Information

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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; Zh

Method used

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

Examples

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Embodiment 1

[0030] 1) Disperse commercially available graphene oxide in 25mL deionized water to form a 1mg / mL solution, and then disperse it with a 300W ultrasonic generator for 1h to form a uniformly dispersed graphene oxide suspension A;

[0031] 2) Add analytically pure soluble iron salt ferric chloride hexahydrate, sodium chloride and 0.3g urea to 25mL absolute ethanol and 10mL deionized water, stir well to dissolve the salt, and then add to suspension A, Configure a mixed solution of salt and graphene oxide, wherein the concentration of the iron salt is 0.05mol / L, and the concentration of the sodium salt is 2 / 3 of the concentration of the iron salt, and then the mixed solution is dispersed by an ultrasonic generator to obtain a suspension B;

[0032] 3) Pour the suspension B prepared above into the polytetrafluoroethylene lining of the homogeneous hydrothermal reactor, the filling degree is 30%, then seal the reactor, and put it into the homogeneous hydrothermal reactor Carry out hyd...

Embodiment 2

[0039] 1) Disperse commercially available graphene oxide in 30mL deionized water to form a 2mg / mL solution, and then disperse it with a 300W ultrasonic generator for 3h to form a uniformly dispersed graphene oxide suspension A;

[0040] 2) Add analytically pure soluble iron salt ferrous sulfate heptahydrate, sodium chloride and 0.35g urea to 25mL of absolute ethanol and 12mL of deionized water, stir well to dissolve the salt, then add it into the suspension A, configure A mixed solution of salt formation and graphene oxide, wherein the concentration of the iron salt is 0.2mol / L, the concentration of the sodium salt is 2 / 3 of the concentration of the iron salt, and then the mixed solution is dispersed by an ultrasonic generator to obtain a suspension B;

[0041] 3) Pour the suspension B prepared above into the polytetrafluoroethylene lining of the homogeneous hydrothermal reactor, the filling degree is 80%, then seal the reactor, and then put it into the homogeneous hydrothermal...

Embodiment 3

[0045] 1) Disperse commercially available graphene oxide in 35mL deionized water to form a 5mg / mL solution, then disperse it with a 300W ultrasonic generator for 2h to form a uniformly dispersed graphene oxide suspension A;

[0046] 2) Add analytically pure soluble iron salt ferric nitrate nonahydrate, sodium chloride and 0.4g urea into 25mL of absolute ethanol and 14mL of deionized water, stir well to dissolve the salt, then add it into the suspension A, and configure it as A mixed solution of salt and graphene oxide, wherein the concentration of the iron salt is 0.3mol / L, the concentration of the sodium salt is 2 / 3 of the concentration of the iron salt, and then the mixed solution is dispersed by an ultrasonic generator to obtain a suspension B;

[0047] 3) Pour the suspension B prepared above into the polytetrafluoroethylene lining of the homogeneous hydrothermal reactor, the filling degree is 60%, then seal the reactor, and then put it into the homogeneous hydrothermal reac...

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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...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/525H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/525H01M4/625H01M10/0525Y02E60/10
Inventor 曹丽云马萌齐慧李嘉胤黄剑锋姚恺陈文卓吴桂娟
Owner SHAANXI UNIV OF SCI & TECH
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