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Transition metal oxide/ graphene nanometer composite electrode material used for lithium battery and preparation method thereof

A transition metal, nanocomposite technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low lithium ion diffusion coefficient, unsatisfactory cycle performance, low electronic conductivity, etc., achieve excellent cycle performance, overcome transition metal The effect of oxide structure change and high specific capacity

Inactive Publication Date: 2012-02-01
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is difficult for oxide materials with traditional structures to make new breakthroughs in specific capacity and electrochemical cycle performance, and due to the low electronic conductivity, low lithium ion diffusion coefficient and structural changes of the host lattice of transition metal oxide materials , leading to its unsatisfactory cycle performance, so designing and preparing composite materials with nanostructures has become an effective way to obtain high-performance lithium battery electrode materials

Method used

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  • Transition metal oxide/ graphene nanometer composite electrode material used for lithium battery and preparation method thereof
  • Transition metal oxide/ graphene nanometer composite electrode material used for lithium battery and preparation method thereof
  • Transition metal oxide/ graphene nanometer composite electrode material used for lithium battery and preparation method thereof

Examples

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Effect test

Embodiment 1

[0024] Preparation of manganese dioxide / graphene oxide nanocomposite electrode material: Manganese sulfate, ammonium persulfate and graphene oxide are used as raw materials, the molar ratio of manganese sulfate and ammonium persulfate is controlled to be 1:1, and graphene oxide is oxidized according to the theoretical product Add 10% of the manganese weight, mix uniformly in water for 1 hour, place in a high-pressure reactor at 90 degrees and react for 24 hours to obtain a manganese dioxide / graphene oxide nanocomposite electrode material for lithium batteries. figure 1 and 2 is the scanning electron microscope image of the composite electrode material.

[0025] The production of lithium secondary battery: the active material manganese dioxide / graphene oxide nanocomposite electrode material, the conductive agent Super P and the binder vinylidene fluoride are mixed uniformly in nitrogen methyl pyrrolidone according to the mass ratio of 85:10:5, and coated on an aluminum foil, a...

Embodiment 2

[0028] The preparation of the manganese dioxide / graphene oxide nanocomposite electrode material is the same as in Example 1, and this material is used as the electrode active material of the lithium battery to assemble a button battery. The production of the lithium secondary battery is basically the same as in Example 1, except that this material is used as the negative electrode active material, mixed evenly with the conductive agent Super P and the binder vinylidene fluoride nitrogen methyl pyrrolidone, and then coated on the copper foil Dry it at 80°C and use it as the negative electrode sheet of the battery. In the voltage range of 0.1V-2V, the constant current charge and discharge test shows that the reversible specific capacity of the battery is 1534mAh / g, and the capacity can be maintained above 950mAh / g after 50 cycles at 0.1C.

Embodiment 3

[0030] Manganese dioxide and graphene are fully mixed in an aqueous solution at a weight ratio of 90:10. The mixing method is mechanically stirred for 1 hour, then ultrasonicated for 30 minutes, spray-dried and granulated to obtain manganese dioxide / graphene nanoparticles for lithium batteries. Composite electrode material. Use this material as the electrode active material of the lithium battery, assemble the button battery, the making of the lithium secondary battery is the same as in Example 1, and in the voltage range of 1.5V-4.5V, the battery specific capacity is shown to be 180mAh through the constant current charging and discharging test / g, 100 cycles at 0.1C and attenuation of 2%.

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Abstract

The invention relates to a transition metal oxide / graphene nanometer composite electrode material used for a lithium battery and a preparation method thereof. The transition metal oxide / grapheme nanometer composite electrode material is the transition metal oxide modified by grapheme or graphene oxide, wherein the transition metal oxide and the grapheme or the graphene oxide can be connected in a physical packaging or chemical bonding mode. One of the following methods is adopted: 1. evenly mixing a precursor and graphene (or graphene oxide) required by preparing the transition metal oxide at the mass ratio of 0.01: 100 to 50: 100 in a solvent, and reacting at a certain temperature and pressure to obtain the nanometer composite electrode material; and 2. fully mixing the graphene (or graphene oxide) and the transition metal oxide at the mass ratio of 0.01: 100 to 50: 100 in a solvent, and drying to obtain the nanometer composite electrode material. The preparation method is simple, is easy to operate and is suitable for large-scale production, the prepared electrode material has higher lithium-ion and electron conductivity, and the assembled lithium battery has the advantages of high lithium battery specific capacity and good cycle performance and is suitable for the lithium battery electrode material.

Description

technical field [0001] The invention belongs to the technical field of energy storage materials, and in particular relates to a transition metal oxide / graphene (or graphene oxide) nanocomposite electrode material for lithium batteries with excellent cycle performance and high specific capacity and a preparation method thereof. Background technique [0002] Energy is the material basis of human social activities. The development of energy, energy and the environment are issues of common concern to the whole world and all mankind. At present, the increasing shortage of chemical fuel resources worldwide forces people to look for new alternative clean energy sources. At the same time, with the rapid development of the information society, there are special demands for efficient and portable energy storage and conversion systems. These energy systems are key components of today's portable electronic consumer products. And from the standpoint of energy conservation and environme...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/131H01M4/1391
CPCY02E60/122Y02E60/10
Inventor 刘兆平姚霞银王军周旭峰王旭阳张建刚
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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