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Preparation method for graphene nanobelt-lithium iron phosphate composite material

A technology of graphene nanobelts and lithium iron phosphate, which is applied in the direction of structural parts, electrical components, battery electrodes, etc., can solve the problems of limited practical application, difficult practical operation, large energy consumption, etc., and achieves good ion transmission performance and convenient Promotion and application, good production safety effect

Active Publication Date: 2017-02-22
重庆锦添翼新能源科技有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main disadvantages of this method are: 1. the method adopts long reflux or stirring treatment for many times, resulting in complex process and large energy consumption, so the production cost of this method is high, because the process is more complicated, the actual operation is difficult, and the energy consumption is large High production cost, not easy to popularize and apply
②The acid chloride reagent used in this method is harmful to the health of workers, and its practical application is limited
③The product prepared by this method fails to make full use of the inner layer structure of carbon nanotubes, resulting in a small contact area between lithium iron phosphate and carbon nanotubes, which is not conducive to maximally improving the conductivity of the composite cathode material
④ In the product prepared by this method, there is only surface contact between carbon nanotubes and lithium iron phosphate, and there is no strong binding force, so that when used as a cathode material for lithium-ion batteries, the cycle stability is affected

Method used

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  • Preparation method for graphene nanobelt-lithium iron phosphate composite material
  • Preparation method for graphene nanobelt-lithium iron phosphate composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The concrete steps of a kind of preparation method of graphene nanoribbon paper are as follows:

[0025] (1) Preparation of graphene nanoribbons

[0026] With carbon nanotube as raw material, potassium permanganate as oxidant, concentrated sulfuric acid as oxidizing acid, according to the quality (g) of the carbon nanotube: the oxidizing agent quality (g): the volume of the oxidizing acid ( mL) in a ratio of 1:5:400. First add the raw materials into the oxidizing acid and stir for 12 hours to prepare mixture 1, then add the oxidizing agent to the mixture 1, stir at room temperature for 1 hour, then transfer to a water bath, and then keep the mixture at a constant temperature of 80°C Stir for 5 hours to prepare mixture 2, then add hydrogen peroxide that can remove excess oxidant to mixture 2 to obtain mixture 3, and finally use hydrochloric acid and deionized water to repeatedly ultrasonically clean mixture 3 to neutrality (pH=7) After drying at 60°C for 12 hours, grap...

Embodiment 2

[0032] A preparation method of graphene nanoribbon paper, with embodiment 1, wherein:

[0033] In the 1st (1) step, oxidizing agent is concentrated nitric acid, and concentrated sulfuric acid is oxidizing acid, and the ratio of described raw material quality (g): described oxidizing acid quality (g): described oxidizing acid volume (ml) is 1: 1 : 50, the raw material is added to the oxidizing acid and the stirring time is 1h, the stirring time is 0.1h after adding the oxidizing agent into the mixture 1, the water bath temperature is 50°C, the stirring time in the water bath process is 1h, and the drying The temperature is 50°C and the drying time is 6h.

[0034] In the (2) step, the mass ratio of the lithium iron phosphate and the graphene nanoribbon prepared in the (1) step is 1: 0.1, and the surfactant cetyltrimethylammonium bromide, The ratio of the mass (g) of the lithium iron phosphate: the mass (g) of the surfactant: the volume of deionized water (mL) is 1:0.001:10, and...

Embodiment 3

[0037] A preparation method of graphene nanoribbon paper, with embodiment 1, wherein:

[0038]In the 1st (1) step, oxidizing agent is potassium permanganate, and perchloric acid is oxidizing acid, and described raw material quality (g): described oxidizing agent quality (g): the ratio of described oxidizing acid volume (ml) is 1:10:2000, the raw material is added to the oxidizing acid and the stirring time is 24 hours, the stirring time is 5 hours after adding the oxidizing agent to the mixture 1, the temperature of the water bath is 90°C, and the stirring time during the water bath is 10 hours , the drying temperature is 120°C, and the drying time is 24h.

[0039] In the (2) step, the mass ratio of the lithium iron phosphate and the graphene nanobelt prepared in the (1) step is 1:0.2, the surfactant polyetherimide, the lithium iron phosphate The mass (g): the mass (g) of the surfactant: the ratio of deionized water volume (mL) is 1:0.1:1000, and the mixing and stirring time ...

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Abstract

The invention discloses a preparation method for a graphene nanobelt-lithium iron phosphate composite material, and belongs to the technical field of a lithium ion battery. A carbon nanotube is subjected to chemical cutting and ultrasonic peeling to prepare a graphene nanobelt; then commercial lithium iron phosphate is endowed with positive static charges through a surfactant; and next, the prepared graphene nanobelt and the lithium iron phosphate are ultrasonically-mixed and dried to prepare the graphene nanobelt-lithium iron phosphate composite material product. The preparation method has the characteristics of simple process, convenient operation, capability of promoting large-scale production, convenience in popularization and application, low energy consumption, low production cost, high production safety and the like; the product prepared by the preparation method has the characteristics of excellent conductivity, high ionic transport property, long cycle life, high rate charge-discharge performance and the like; the preparation method can be widely applied to the preparation of the graphene nanobelt-lithium iron phosphate composite material; and the product prepared by the preparation method can be widely used as a positive electrode material to be applied to the lithium ion battery which has high requirement on cycle performance and rate capability.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a method for preparing a graphene nanobelt-lithium iron phosphate composite positive electrode in the technical field of lithium ion batteries. Background technique [0002] Lithium iron phosphate is a new type of cathode material for lithium-ion batteries. It has the characteristics of large discharge capacity, good safety performance, low price, non-toxicity, no pollution, long life, etc., and can be widely used in energy storage equipment, electric tools, light electric vehicles, small electrical appliances and mobile power supplies. Although lithium iron phosphate has the above excellent characteristics, the practical application of lithium iron phosphate is severely restricted due to its low electrical conductivity. Although the conductivity of lithium iron phosphate can be significantly improved by doping conductive agent materials such as carbon black, carbo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M10/0525
CPCH01M4/364H01M4/5825H01M10/0525Y02E60/10
Inventor 李新禄李同涛张欣琳粟泽龙钟奇能
Owner 重庆锦添翼新能源科技有限公司
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