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Graphene/metal oxide composite cathode material for lithium ion battery and preparation

A technology for lithium ion batteries and negative electrode materials, which is applied in battery electrodes, circuits, electrical components, etc., to achieve good electrochemical performance, strong binding ability, and superior rate performance.

Inactive Publication Date: 2012-08-22
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a high-performance graphene / metal oxide composite negative electrode material for lithium ion batteries and its preparation method, to solve the problem of cycle stability in high-capacity and easy-to-powder negative electrode materials

Method used

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  • Graphene/metal oxide composite cathode material for lithium ion battery and preparation
  • Graphene/metal oxide composite cathode material for lithium ion battery and preparation
  • Graphene/metal oxide composite cathode material for lithium ion battery and preparation

Examples

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Embodiment 1

[0040] Example 1: Preparation of graphene / iron tetroxide composite negative electrode material by liquid phase in situ polymerization method combined with in situ solid phase dehydration carbon thermal reduction reaction

[0041] (1) Weigh 50mg of graphene, add it to 150ml of 0.05M ferric chloride aqueous solution for ultrasonic dispersion to make a graphene dispersion, heat and stir the graphene dispersion at 80°C for hydrolysis, and the hydrolysis time is 4-12h (the present embodiment is 8h), make graphene / iron oxyhydroxide complex, the length of gained hydrolysis complex is 200-400nm, and width is 60-80nm;

[0042] (2) In-situ solid-phase dehydration charcothermal reduction reaction: After the hydrolyzed compound in step (1) is filtered and dried, the graphene and The in-situ dehydration and charcothermal reduction reaction of iron oxyhydroxide takes 4 to 8 hours (6 hours in this embodiment) to obtain the graphene / ferric iron tetroxide composite negative electrode material....

Embodiment 2

[0043] Example 2: Preparation of graphene / cobalt tetroxide composite negative electrode material by co-precipitation method combined with in-situ heat treatment oxidation

[0044] (1) Weigh the graphene of 100mg, join in the isopropanol and water mixed solution of 100ml (volume ratio 1: 1) carry out ultrasonic dispersion 0.5h and make graphene dispersion liquid, transfer dispersion liquid in the there-necked flask afterwards and Pass through argon protection, weigh 0.05-0.5mol (0.1mol in this embodiment) cobalt nitrate and join in the above-mentioned dispersion liquid, then drip into the ammonia solution (concentration 25wt%) of stoichiometric ratio, fully under the protection of argon atmosphere Stir for 3 hours to ensure that the reaction is complete, then filter and dry to obtain the graphene / cobalt hydroxide composite;

[0045] (2) In-situ heat treatment oxidation reaction: the co-precipitated composite in step (1) is subjected to an in-situ dehydration oxidation reaction ...

Embodiment 3

[0046] Embodiment 3: Synthesis of graphene / ferric oxide composite negative electrode material by hydrothermal method

[0047] (1) Weigh the graphene of 50mg, join in the 0.06M ferric nitrate aqueous solution of 50ml and carry out ultrasonic dispersion and make graphene dispersion liquid, then add 7.5mmol urea and 4mmol sodium citrate in above-mentioned graphene dispersion liquid and stir 2 -4h (the present embodiment is 4h), then put into the reaction pot and carry out hydrothermal reaction, the reaction temperature is 160-200°C (the present embodiment is 180°C), and the reaction time is 6-24h (the present embodiment is 12h) , to obtain a graphene / ferric oxide composite, in which the ferric oxide is a uniform spherical particle, and all of them are ferric oxide nanospheres with a size of 80-100nm formed by agglomeration of nanoparticles. The scanning electron microscope image is shown in Figure 1(b). It can be seen that the ferric oxide nanospheres are evenly distributed in th...

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Abstract

The invention belongs to the fields of material synthesis and energy technology, and especially relates to a graphene / metal oxide composite cathode material for lithium ion batteries and a preparation method thereof. Grapheme is dispersed into various metal oxide precursor salt solutions; a graphene / metal oxide compound is obtained directly by a hydrothermal method, or an graphene / metal oxide compound is obtained by a liquid in-situ polymerization method or a coprecipitation process; and the graphene / metal oxide compound is obtained by heat treatment or hydrothermal treatment. In the invention, the novel three-dimensional composite cathode material of graphene-coated metal oxide or graphene-anchored metal oxide is prepared by carrying metal oxide particles with graphene as a carrier. The obtained composite material can be used as a lithium ion battery cathode, which has a high specific capacity, excellent cycle stability and rate capability, and is expected to be used as a lithium ion battery cathode material with a high energy density and a high power density.

Description

technical field [0001] The invention belongs to the technical field of material synthesis and energy, and in particular relates to a graphene / metal oxide composite negative electrode material for a lithium ion battery and a preparation method thereof. Background technique [0002] With the increasingly prominent energy crisis and environmental problems, lithium-ion batteries, as a new energy storage device for renewable energy, are clean and pollution-free. Lithium-ion batteries have excellent comprehensive properties such as high working voltage, high energy density, long cycle life, light weight, and small self-discharge. They have developed rapidly in recent years and have important roles in civil, transportation, electronics, military, aerospace and other fields. application. However, with the needs of people's lives, especially lithium-ion batteries, as the most potential driving energy for electric vehicles and hybrid vehicles in the future, must have higher energy de...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/139
CPCY02E60/10
Inventor 成会明周光敏李峰吴忠帅任文才
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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