Lithium titanate/M-graphene composite cathode material for lithium ion battery and preparation method of lithium titanate/M-graphene composite cathode material

A graphene composite, lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor high-rate charge and discharge performance, low specific capacity, poor conductivity, etc., to achieve good rate performance, high ratio Capacity, the effect of improving poor conductivity

Inactive Publication Date: 2016-07-13
HEFEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to provide a lithium titanate / M-graphene composite negative electrode material for lithium ion batteries. The problems to be solved are that the lithium titanate negative electrode material has poor conductivity, low specific capacity and poor high-rate charge and discharge performance, etc. Disadvantages, use the double composite of graphene and metal particles to improve the electrochemical performance of the material, and at the same time provide a lithium titanate / M (M=silver, copper)-graphene composite with simple process, no pollution, and low energy consumption Preparation method of negative electrode material

Method used

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  • Lithium titanate/M-graphene composite cathode material for lithium ion battery and preparation method of lithium titanate/M-graphene composite cathode material
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  • Lithium titanate/M-graphene composite cathode material for lithium ion battery and preparation method of lithium titanate/M-graphene composite cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Graphite oxide, graphene and silver-graphene are prepared according to the following steps in this example:

[0048] a. Put 3g of graphite powder and 18g of potassium permanganate into a flask for mixing, then add a mixed acid obtained by mixing 360mL of concentrated sulfuric acid and 40mL of concentrated phosphoric acid into the flask, mix well and place on a magnetic stirrer Heating while stirring, continuous reaction at 50°C for 12 hours to fully oxidize the graphite powder; after the reaction is completed, pour the mixed solution into pre-frozen ice water (the ice cube is made of about 400ml water and 8-10ml Hydrogen peroxide solution with a mass fraction of 30%), let it stand for a period of time until the ice cubes completely melt; then, wash them with deionized water, 0.1mol / L dilute hydrochloric acid, and absolute ethanol, and dry to obtain graphite oxide .

[0049] b. Put 0.06g of synthesized graphite oxide into 30mL of absolute ethanol, perform ultrasonic tre...

Embodiment 2

[0052] Lithium titanate / silver-graphene composite negative electrode material for lithium ion battery is prepared according to the following steps in this example:

[0053] a. Weigh 0.043mol of LiOH.H 2 O was dissolved in deionized water to form lithium hydroxide solution A with a concentration of 2mol / L, and 0.05mol of Ti (OC 4 h 9 ) 4 Pour into absolute ethanol, the volume ratio of the two is 1:1, put it on a magnetic stirrer and stir quickly to form solution B; slowly add the prepared solution A into solution B, and then continue to stir for 1-2h ;Transfer the resulting white emulsion to a polytetrafluoroethylene reactor, after continuous reaction at 180°C for 24h, centrifugally wash with deionized water or absolute ethanol, and then dry at 60°C to obtain a precursor . Finally, calcined at 700 °C for 8 hours to obtain white Li 4 Ti 5 o 12 particles

[0054] b. First, take 2g of the white LTO that has been synthesized above and put it into 20mL of absolute ethanol, s...

Embodiment 3

[0059] Lithium titanate / silver-graphene composite negative electrode material for lithium ion battery is prepared according to the following steps in this example:

[0060] A, adopt the same method as embodiment 2 to prepare pure phase lithium titanate;

[0061] b. First, take 2g of the white LTO that has been synthesized above and put it into 20mL of absolute ethanol, stir quickly to disperse the material evenly, and then put the prepared 2.0g / L GO (first ultrasonic treatment for one hour to make the oxidation Graphite flake separation), silver nitrate solution and hydrazine hydrate were slowly added dropwise to the above solution, GO and AgNO 3 The amount added is 3% of the weight of LTO, and hydrazine hydrate is AgNO according to the molar ratio of substances. 3 : Hydrazine hydrate = 1:2 is added, then the uniformly dispersed solution is transferred to a polytetrafluoroethylene reactor, reacted continuously at 120°C for 16 hours, after the temperature is naturally cooled t...

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Abstract

The invention discloses a lithium titanate/M-graphene composite cathode material for a lithium ion battery and a preparation method of the lithium titanate/M-graphene composite cathode material. The lithium titanate/M-graphene composite cathode material is prepared by dually compounding graphene and metal particles. The preparation method comprises the following steps: preparing a pure-phase lithium titanate material by a hydrothermal method, then fully mixing the pure-phase lithium titanate material with graphene oxide and metal salt (or metal alkali), and performing reaction in a reaction kettle under the action of a proper amount of reducing agents to obtain the lithium titanate/M-graphene composite cathode material. According to the preparation method, the lithium titanate/M-graphene composite cathode material is prepared by reduction by a simple solvothermal method; the preparation method is easy to operate, low in requirement on conditions, low in cost and very suitable for industrial production; furthermore, the prepared lithium titanate/M-graphene composite cathode material is high in conductivity, high in specific capacity, high in high-rate discharging performance and excellent in circulating performance, and can be widely applied to various types of portable electronic equipment and electric automobiles.

Description

technical field [0001] The invention relates to a negative electrode material for a lithium ion battery, in particular to a lithium titanate / M-graphene composite negative electrode material for a lithium ion battery and a preparation method thereof, in which lithium titanate / M-graphene is double compounded with graphene and metal particles to prepare lithium titanate / M- Graphene composite anode material. Background technique [0002] As a new generation of secondary batteries, lithium-ion batteries have the advantages of high working voltage, high energy density, long cycle life, high safety, and environmental friendliness. They are widely used in portable computers, mobile phones, digital cameras, submarines, and aerospace fields. and other electronic equipment, and with the depletion of traditional energy such as oil and coal and the increasingly severe environmental pollution, it is becoming more and more important to develop green new energy to replace traditional energy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/583H01M4/62H01M4/36H01M10/0525
CPCH01M4/362H01M4/485H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 朱继平张阳阳程方圆张文蓝王娟祝杰温晓辉王杰党乐阳
Owner HEFEI UNIV OF TECH
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