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Composite material of lithium ion battery, preparation method thereof and lithium ion battery

A lithium-ion battery and composite material technology, applied in the field of lithium-ion batteries, can solve the problem that the isotropy of graphite negative electrode materials cannot be satisfied.

Inactive Publication Date: 2014-06-18
BTR NEW MATERIAL GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The isotropy of the graphite negative electrode material obtained by the method still cannot meet the needs of lithium-ion battery negative electrode materials with excellent orientation properties

Method used

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  • Composite material of lithium ion battery, preparation method thereof and lithium ion battery
  • Composite material of lithium ion battery, preparation method thereof and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0068] The natural graphite is pulverized and spheroidized by an internal classification micropowder in a continuous feeding mode, the pulverization speed is 4000rpm, and the time is 2min to obtain graphite particles; the obtained graphite particles and mesophase pitch are mixed with VC at a mass ratio of 80.0:20.0 , the mixing time is 3min, the temperature is 80°C, and the graphite-pitch mixture is obtained; the graphite-pitch mixture is extruded, the pressure is 5000KN, the temperature is 20°C, and the pressurization treatment time is 30min, the compacted density of the block is obtained 1.500g / cc; then carry out isostatic pressing treatment, the pressure is 8000KN, the temperature is 200℃, the pressure treatment time is 180min, and the compacted density of the obtained block is 1.800g / cc; Heat treatment in the heat treatment process, the heating rate during the heat treatment process is 3.0°C / min, the treatment temperature is 3200°C, and the treatment time is 240.0h; the pro...

Embodiment 2

[0070] The natural composite graphite (obtained by uniformly mixing natural graphite and artificial graphite at a mass ratio of 80.0:20.0) is fused for 20 minutes, the rotation speed is 2500 rpm, the cavity gap is 0.5 cm, and the processing temperature is 40 ° C to obtain graphite particles; Mix graphite particles with modified asphalt with a softening point of 130°C at a mass ratio of 90.0:10.0. The mixing method is liquid phase mixing and spray drying. The solvent is a combination of phase IV furan and ethanol. The speed of the mixer is 3000rpm and the mixing time is 120min. , the solid content of the suspension is 45%, the inlet temperature of the spray dryer is 150°C, the outlet temperature is 80°C, and the pressure is 80MPa to obtain a powder; the powder is subjected to hot molding treatment with a processing pressure of 6000KN and a processing temperature of 100 ℃, pressurized treatment time is 60min, and the compacted density of the obtained block is 1.400g / cc; then isos...

Embodiment 3

[0072] The natural composite graphite (obtained by uniformly mixing natural graphite and mesophase carbon microspheres at a mass ratio of 55.0:45.0) was subjected to ball milling, the ball milling time was 60min, the instrument speed was 200rpm, and the diameter of the corundum ball was 8mm to obtain graphite particles; The obtained graphite particles and the high molecular weight polymer were stirred in the liquid phase according to the mass ratio of 85.0:15.0 and then dried to obtain a powder; the obtained powder was subjected to cold molding treatment with a pressure of 10000KN, a temperature of 25°C, and a pressure treatment time of 6 minutes. The obtained block has a compacted density of 1.600g / cc; then isostatic pressing is carried out at a pressure of 8000KN, a temperature of 200°C, and a pressurized treatment time of 180min to obtain a block with a compacted density of 2.000g / cc; the obtained block is The body is placed in a tunnel kiln for heat treatment, the treatment...

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Abstract

The invention relates to a composite material of a lithium ion battery, a preparation method thereof and the lithium ion battery. The composite material of the lithium ion battery is isotropic and comprises a carbon material which is used as a supporting skeleton and graphite particles which are embedded into the carbon material, wherein the carbon material is a product from thermal treatment of a binder; the graphite particles are formed by natural graphite or natural composite graphite which is formed by compounding natural graphite and auxiliary materials, and the mass of the graphite particles accounts for 50.0 to 99.9 percent of the total mass of the composite material. The composite material is high in orientation, high in capacity, high in rate capacity and long in service life; the preparation method is moderate in condition, simple in process and low in cost.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a composite material for lithium ion batteries, a preparation method thereof and lithium ion batteries. Background technique [0002] Lithium-ion battery, as a mature electrochemical power system, has been used in all aspects of people's daily life, and has been applied in power battery vehicles. Composite materials for lithium-ion batteries, which are currently widely used and have better comprehensive performance, have good performance in terms of capacity, efficiency and liquid absorption performance, but as secondary batteries, the orientation performance and cycle performance of lithium-ion batteries are also inferior. attention. However, these two performances of materials used in lithium-ion batteries are often unsatisfactory, or these two performances are not compatible with other excellent performances. In order to improve the orientation performance and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M10/0525
CPCY02E60/122H01M4/362H01M4/583H01M10/0525Y02E60/10
Inventor 岳敏闫慧青刘福静刘若琦何山
Owner BTR NEW MATERIAL GRP CO LTD
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