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Preparation method and application of carbon-coated Fe3O4 nanoparticle lithium ion battery negative electrode material

A lithium-ion battery and nanoparticle technology, applied in battery electrodes, nanotechnology, secondary batteries, etc., can solve the problems of difficult control of microscopic morphology and structure, high production cost, large particle size, etc., and achieve good conductivity And the effect of stabilizing electrochemical performance, improving stability, and excellent electrochemical performance

Inactive Publication Date: 2015-10-21
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention overcomes the carbon coated Fe obtained in the prior art 3 o 4 The particle size is large, it is difficult to control its microscopic shape and structure, and the electrochemical performance of lithium-ion battery anode materials prepared with it is not good, the preparation process is complicated and the production cost is high.

Method used

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  • Preparation method and application of carbon-coated Fe3O4 nanoparticle lithium ion battery negative electrode material
  • Preparation method and application of carbon-coated Fe3O4 nanoparticle lithium ion battery negative electrode material
  • Preparation method and application of carbon-coated Fe3O4 nanoparticle lithium ion battery negative electrode material

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Experimental program
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Effect test

Embodiment 1

[0031] The first step, precursor carbon coated Fe 2 o 3 Preparation of nanoparticles:

[0032] Weigh the required amount of ferric chloride hexahydrate (FeCl 3 ·6H 2 O) and citric acid (C 6 h 8 o 7 ) and dissolved in deionized water to prepare a mixed solution of ferric chloride and citric acid, so that ferric chloride (FeCl 3) concentration is controlled at 0.005mol / L, the molar percentage of carbon atoms in citric acid and iron atoms in ferric chloride is 1:1, use a magnetic stirrer to stir the mixed solution at a speed of 100r / min for 15min, and then ultrasonically disperse the mixed solution for 15min , to obtain a clear mixed solution mixed uniformly between the two, transfer the clear mixed solution to a reaction kettle with polytetrafluoroethylene as the substrate, place the reaction kettle in an oven, keep it warm at 150°C for 1h, and then react the The kettle was naturally cooled to room temperature with the oven, and the mixed solution after the reaction was t...

Embodiment 2

[0045] The first step, precursor carbon coated Fe 2 o 3 Preparation of nanoparticles:

[0046] Weigh the required amount of ferric chloride hexahydrate (FeCl 3 ·6H 2 O) and citric acid (C 6 h 8 o 7 ) and dissolved in deionized water to prepare a mixed solution of ferric chloride and citric acid, so that ferric chloride (FeCl 3 ) concentration is controlled at 2.5mol / L, the molar percentage of carbon atoms in citric acid and iron atoms in ferric chloride is 20:1, use a magnetic stirrer to stir the mixed solution for 35min at a speed of 250r / min, and then ultrasonically disperse the mixed solution for 35min , to obtain a clear mixed solution mixed uniformly between the two, transfer the clear mixed solution to a reaction kettle with polytetrafluoroethylene as the substrate, place the reaction kettle in an oven, keep it warm at 200 ° C for 8 hours, and then react the The kettle was naturally cooled to room temperature with the oven, and the mixed solution after the reactio...

Embodiment 3

[0053] The first step, precursor carbon coated Fe 2 o 3 Preparation of nanoparticles:

[0054] Weigh the required amount of ferric chloride hexahydrate (FeCl 3 ·6H 2 O) and citric acid (C 6 h 8 o 7 ) and dissolved in deionized water to prepare a mixed solution of ferric chloride and citric acid, so that ferric chloride (FeCl 3 ) concentration is controlled at 5mol / L, the molar percentage of carbon atoms in citric acid and iron atoms in ferric chloride is 40:1, using a magnetic stirrer to stir the mixed solution for 60min at a speed of 400r / min, and then ultrasonically disperse the mixed solution for 60min, Obtain a clear mixed solution that is uniformly mixed with the two, transfer the clear mixed solution to a reaction kettle with polytetrafluoroethylene as the substrate, place the reaction kettle in an oven, and keep it warm at 250°C for 15h, and then the reaction kettle Naturally cool to room temperature with the oven, take out the mixed solution after reaction, and ...

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Abstract

The invention relates to a preparation method and an application of a carbon-coated Fe3O4 nanoparticle lithium ion battery negative electrode material, and relates to an electrode used in a lithium storage battery and formed based on an oxide active material; the preparation method is a method for preparing the carbon-coated Fe3O4 nanoparticle lithium ion battery negative electrode material by a hydrothermal method and a high temperature calcination process and comprises the steps: preparation of precursor carbon-coated Fe2O3 nanoparticles, preparation of a carbon-coated Fe3O4 nanoparticle powder, and preparation of the carbon-coated Fe3O4 nanoparticle lithium ion battery negative electrode material. The carbon-coated Fe3O4 nanoparticle lithium ion battery negative electrode material is applied as a lithium ion battery negative electrode piece for assembly of a semi-battery. The defects that carbon-coated Fe3O4 nanoparticles prepared in the prior art have larger particle size, the microtopography and the structure are difficult to control, a lithium ion battery negative electrode material prepared by the carbon-coated Fe3O4 nanoparticles has not good electrochemical performance, the preparation process is complex and the production cost is high are overcome.

Description

technical field [0001] The technical solution of the present invention relates to electrodes for lithium batteries consisting of oxide-based active materials, in particular carbon-coated Fe 3 o 4 Preparation method and application of nanoparticle lithium ion battery negative electrode material. Background technique [0002] With the rapid development of the world economy and the excessive consumption of global resources, it is urgent to solve the problems of environmental pollution and energy depletion. As a new energy source, lithium-ion batteries have been widely focused due to their advantages of high energy density, long cycle life, high conversion efficiency and environmental friendliness. Today, lithium-ion batteries have been widely used in portable devices such as mobile phones and notebook computers, and will be used in electric vehicles and hybrid vehicles, so there are higher requirements for the capacity and rate discharge performance of lithium-ion batteries. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/52H01M4/139H01M10/0525B82Y40/00
CPCB82Y40/00H01M4/139H01M4/362H01M4/523H01M10/0525Y02E60/10
Inventor 李乐李海鹏张永光陈贵锋韦亚琼杨宁江颖徐倩田晶
Owner HEBEI UNIV OF TECH
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