Cathode composite material of lithium ion battery and preparation method thereof

A technology of lithium-ion batteries and composite materials, which is applied in the field of lithium-ion battery negative electrode composite materials and its preparation, can solve the problems of low rate performance, limit the application of lithium-ion batteries, and cannot meet the development needs of power lithium-ion batteries. Simple, conducive to wide application, and the effect of reducing production costs

Inactive Publication Date: 2012-07-11
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

[0005] The lithium-ion battery negative electrode composite material reported in the above literature with CNTs as conductive additive has better electrode rate discharge ability than conductive carbon black as conductive additive, but the rate performance of this lithium-ion battery negative electrode composite material is still low. , still cannot meet the development needs of power lithium-ion batteries, thus limiting the application of lithium-ion batteries

Method used

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  • Cathode composite material of lithium ion battery and preparation method thereof
  • Cathode composite material of lithium ion battery and preparation method thereof
  • Cathode composite material of lithium ion battery and preparation method thereof

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[0039] The present invention provides a kind of preparation method of negative electrode composite material of lithium ion battery, comprises the following steps:

[0040] Mixing graphene, electrode active material and water to obtain a mixed solution;

[0041] Drying the mixed solution to obtain a lithium-ion battery negative electrode composite material;

[0042] The electrode active material is one or more of mesophase pitch carbon microspheres, silicon, lithium titanate, titanium dioxide, tin dioxide and graphite.

[0043] The invention firstly mixes graphene, electrode active material and water to obtain a mixed solution. In the present invention, before mixing the graphene, the electrode active material and water, the graphene and the electrode active material are preferably ground to obtain the ground graphene and the electrode active material, preferably under ultrasonic conditions, the obtained The ground graphene is mixed with electrode active material and water. ...

Embodiment 1

[0053] The particle size of 0.1g is about 10μm, and the specific surface area is 153m 2 Graphene and 10g mesophase pitch carbon microspheres of / g, electrical conductivity are mixed with 10g mesophase pitch carbon microsphere, after grinding evenly, add 1010mL deionized water wherein, obtain the mixed solution that mixes after ultrasonic dispersion; Described mixed solution is added in In the spray dryer, the flow rate of the mixed solution is controlled to be 3mL / min, the temperature at the inlet is 150°C, and the temperature at the outlet is 50°C, and the lithium-ion battery negative electrode composite material is obtained at the outlet.

[0054] The present invention carries out scanning electron microscope (SEM) scanning analysis to the negative electrode composite material of lithium ion battery obtained, and the result is as follows: figure 1 as shown, figure 1 The SEM image of the lithium-ion battery negative electrode composite material prepared for Example 1 of the ...

Embodiment 2

[0061] 1g particle size is about 30μm, specific surface area is 150m 2 Graphene and 50g mesophase pitch carbon microspheres mixed with Graphene and 50g mesophase pitch carbon microspheres of / g, electrical conductivity are 715S / cm, after grinding uniformly, add 2550mL deionized water wherein, obtain the mixed solution that mixes after ultrasonic dispersion; Described mixed solution is added in In the spray dryer, the flow rate of the mixed solution is controlled to be 6mL / min, the temperature of the feed port is 200°C, and the temperature of the discharge port is 80°C, and the lithium-ion battery negative electrode composite material is obtained at the discharge port.

[0062] The present invention carries out scanning electron microscope (SEM) scanning analysis to the negative electrode composite material of lithium ion battery obtained, and the result is as follows: Figure 4 as shown, Figure 4 The SEM image of the lithium-ion battery negative electrode composite material ...

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Abstract

The invention provides a cathode composite material of a lithium ion battery. The cathode composite material comprises graphene and an electrode active material, wherein the electrode active material is one or more of intermediate-phase bituminous coal microspheres, silicon, lithium titanate, titanium dioxide, tin dioxide and graphite. According to the invention, the graphene and the electrode active material are mixed with water to obtain a mixed solution, which is dried to obtain the cathode composite material of the lithium ion battery. According to the invention, the graphene is adopted as an electroconductive additive, has favorable electroconductive performance, mechanical strength and huge specific surface area, can be favorably attached to the surface of the electrode active material, and is beneficial for shortening the diffusion path of lithium ions, so that the ionic conductivity of the cathode composite material of the lithium ion battery is increased; in addition, the addition of the graphene is beneficial to the enhancement of the full contact between the cathode material of the battery and a current collector, so that the cyclic performance and the multiplying power of the lithium ion battery can be improved in a better way; and the cathode composite material of the lithium ion battery, provided by the invention, has better electric properties.

Description

technical field [0001] The invention relates to the technical field of lithium battery electrodes, in particular to a lithium ion battery negative electrode composite material and a preparation method thereof. Background technique [0002] Today, with the rapid development of information technology and the increasing emphasis on environmental protection, the development of chemical power sources is facing greater challenges. Lithium-ion batteries have been greatly developed because of their advantages such as high energy density, high output voltage, long service life, good cycle performance, low self-discharge rate, no memory effect and good environmental performance. It has been widely used in electronic products such as mobile phones, notebook computers, cameras, vehicles such as electric vehicles and electric bicycles, aerospace vehicles such as airplanes, satellites and spaceships, and military equipment such as warships and submarines. It is widely used and has broad ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36
CPCY02E60/12Y02E60/10
Inventor 刘兆平王国华曹海亮周旭峰
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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