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Ellipsoidal SiOx/graphite cathode composite material and preparation method and application thereof

A composite material and graphite negative electrode technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve problems such as difficult control of sintering temperature, and achieve improved tap density, excellent cycle performance, good dispersion and fixation Effect

Active Publication Date: 2017-02-15
BEIJING IAMETAL NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is also a difficult problem to control the sintering temperature.

Method used

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  • Ellipsoidal SiOx/graphite cathode composite material and preparation method and application thereof
  • Ellipsoidal SiOx/graphite cathode composite material and preparation method and application thereof
  • Ellipsoidal SiOx/graphite cathode composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Preparation of Ellipsoidal SiOx / Graphite Anode Composite

[0043] Step 1): After ball milling silicon oxide powder with a particle size of 1mm, the particle size after crushing is about 300nm, mixed according to the mass ratio of silicon oxide: graphite = 2:8, using water as a solvent, PAN as a polymer additive, The weight-average molecular weight is 300,000, sucrose is a hydroxyl dispersant, the quality of PAN polymer additive is 3% of the total mass of silicon oxide and graphite, and the quality of sucrose is 10% of the total mass of silicon oxide and graphite. slurry;

[0044] Step 2): add an appropriate amount of water, and stir at room temperature for more than 5 hours to obtain a slurry with a viscosity of 200 mPa·s;

[0045] Step 3): Spray drying the slurry at a temperature of 150° C. to obtain powder A;

[0046] Step 4): The natural graphite is pulverized and refined by an airflow vortex micronizer, and the particle size of the natural graphite is 100 mesh;

...

Embodiment 2

[0056] The difference between embodiment 2 and embodiment 1 is:

[0057] In step 1), the mass ratio of silicon oxide: graphite = 4:6, the particle size of silicon oxide is 5mm, and the particle size of the crushed material is 1 μm;

[0058] Step 2) the viscosity of the obtained slurry is 100mPa·s;

[0059] Step 4) The particle size of the natural graphite is 300 mesh.

[0060] The positive electrode, negative electrode, electrolyte and battery assembly of the battery are the same as in Example 1. The composition of the obtained silicon oxide and carbon electrode materials and the test results of the battery are listed in Table 1-2.

Embodiment 3

[0062] The difference between embodiment 3 and embodiment 1 is:

[0063] In step 1), carbon nanotubes are used instead of graphite, silicon oxide: carbon nanotubes = 6:4 mass ratio, the particle size of silicon oxide is 5 mm, and the particle size of the crushed material is 1 μm;

[0064] Step 2) the viscosity of the obtained slurry is 100mPa·s;

[0065] Step 3) The drying method adopts vacuum drying; the temperature is less than 180°C;

[0066] Step 4) The particle size of the natural graphite is 300 mesh.

[0067] The characterization of silicon oxide and carbon composite material is the same as that of Example 1.

[0068] The positive electrode, negative electrode, electrolyte and battery assembly of the battery are the same as in Example 1. The composition of the obtained silicon oxide and carbon electrode materials and the test results of the battery are listed in Table 1-2.

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Abstract

The invention provides an ellipsoidal SiOx / graphite cathode composite material prepared from raw materials including graphite and silicon monoxide, and a preparation method of application of the ellipsoidal SiOx / graphite cathode composite material. According to the method, the graphite and the silicon monoxide blocks are used as the raw materials, a slurry drying and ellipsoid technology is used, finally, wrapping is implemented, specific surface area is reduced effectively, and a stable SEI film is formed; and owing to good dispersion and reasonable cavities of the silicon monoxide, the circulating performance of the material is excellent.

Description

technical field [0001] The invention relates to an ellipsoidal SiO x / Graphite anode composites, especially involving ellipsoidal SiO x / Graphite negative electrode composite material as the application of high specific capacity lithium ion battery negative electrode material. [0002] Background technique: [0003] Lithium-ion batteries have outstanding advantages such as high specific energy, small self-discharge, long service life, green and pollution-free, and have been widely used in portable electronic products and electric vehicles. With the development and progress of society, the further application of lithium-ion batteries urgently needs to increase the energy density, and the development of electrode materials with high specific capacity is one of the effective ways. [0004] Among the negative electrode materials, carbon materials are mainly commercialized at present, and their theoretical specific capacity is low, about 372mAh g -1 . Silicon has a high theore...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/38H01M4/583H01M4/62H01M4/36H01M10/0525
CPCH01M4/362H01M4/386H01M4/483H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 郭玉国李金熠徐泉殷雅侠
Owner BEIJING IAMETAL NEW ENERGY TECH CO LTD
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