Graphite negative electrode material, preparation method and lithium ion battery

A lithium-ion battery and graphite negative electrode technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of cycle performance attenuation and inability to improve the structure

Active Publication Date: 2016-11-30
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Natural spherical graphite is obtained by mechanical spherification of flaky natural flake graphite. There are many pores inside the formed natural graphite. Ordinary surface modification cannot improve the structure of the inner surface of these pores. During the process of deintercalating lithium, the Part of the inner surface layer of graphite is easy to peel off first when lithium ions are deintercalated and solvent co-intercalated, resulting in attenuation of cycle performance

Method used

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  • Graphite negative electrode material, preparation method and lithium ion battery
  • Graphite negative electrode material, preparation method and lithium ion battery
  • Graphite negative electrode material, preparation method and lithium ion battery

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preparation example Construction

[0028] see figure 1 , the present invention provides a method for preparing a graphite negative electrode material, the graphite negative electrode material is mainly used in lithium-ion batteries (not shown), which includes the following steps:

[0029] Step S1, mixing natural spherical graphite and pitch, mixing evenly, heating and impregnating under preset pressure, the pitch softens and flows to fill the internal pores of natural spherical graphite, and obtains an intermediate product after cooling.

[0030] Specifically, a certain amount of natural spherical graphite and powdered pitch are first weighed and mixed, and then the mixture is put into a reaction kettle for sealing and pressure-holding heating. Fill to the internal pores of natural spherical graphite, impregnate for a period of time, and cool to obtain an intermediate product.

[0031] Wherein, the average particle size range of the natural spherical graphite raw material is 3-28um.

[0032] Wherein, the asph...

Embodiment 1

[0046] Mix natural spherical graphite with an average particle size of 17.8um and powdered impregnated pitch (with quinoline insoluble content of 0.5%) at a mass ratio of 1:1, then add to the reactor, seal the reactor, and heat at 3°C Raise the temperature to 300°C per minute, keep the temperature constant for 2 hours, and keep the pressure at 0.2MPa, then take out the sample, and install the furnace for graphitization after the sample is cooled. The graphitized sample was pulverized and classified to obtain a graphite sample with an average particle size of 19.6um. The surface of the graphite sample was coated with 2% by mass of petroleum pitch by spray drying, and then carbonized at 1100 °C under a nitrogen atmosphere to obtain modified graphite.

[0047]Capacity and efficiency test: The modified graphite negative electrode material obtained in Example 1, CMC, and SBR were evenly mixed in a mass ratio of 96.5:1.5:2, then coated on the copper foil current collector, dried, an...

Embodiment 2

[0051] Mix natural spherical graphite with an average particle size of 11.5um, powdered impregnated pitch (0.5% quinoline insoluble content), and furfural accounting for 0.1% of the pitch mass, wherein the mass ratio of natural spherical graphite to pitch is 1 :0.6, then put into the reactor, seal the reactor, heat up to 250°C at 3°C / min, keep the temperature constant for 2h, keep the pressure at 0.2MPa, then take out the sample, and install the furnace for graphitization after the sample is cooled. The graphitized sample was pulverized and classified to obtain a graphite sample with an average particle size of 12.3um. The surface of the graphite sample was coated with 2% by mass coal tar pitch by mixing in a VC mixer, and then carbonized at 1000 °C under an argon atmosphere to obtain modified graphite.

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Abstract

The invention provides a preparation method of a graphite negative electrode material. The method comprises the following steps: S1: after natural spherical graphite and asphalt are mixed evenly, carrying out heating dipping under preset pressure intensity, carrying out asphalt softening, and causing the asphalt to flow and fill the internal pore of the natural spherical graphite, and cooling to obtain an intermediate product; and S2: carrying out graphitization on the intermediate product, and carrying out smashing and grading to obtain the graphite negative electrode material. By use of the preparation method of the graphite negative electrode material, the asphalt is softened at a high temperature, the softened asphalt flows and fills the internal pore of a graphite particle, and the graphite negative electrode material with excellent circulation performance is obtained through the graphitization. The preparation method has the advantages of being simple in technology, low in cost and high in practicality. The invention also provides the graphite negative electrode material prepared from the preparation method, and a lithium ion battery which applies the graphite negative electrode material.

Description

technical field [0001] The invention belongs to the technical field of preparation of graphite negative electrode materials, and in particular relates to long cycle, low expansion and compacted graphite negative electrode materials, a preparation method and a lithium ion battery. Background technique [0002] With the demand for production and the improvement of environmental protection awareness, new energy has become the focus of development in various countries. Among them, the development of lithium battery is particularly rapid, and its application involves 3C products, power devices, energy storage equipment and other fields. The development of negative electrode materials is the cornerstone of the development of lithium batteries. At present, the commercialized negative electrode materials are mainly graphite negative electrodes, among which natural graphite is widely used due to its abundant resources and excellent performance. However, during the lithium-deintercala...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M10/0525C01B31/04
CPCH01M4/587H01M10/0525Y02E60/10
Inventor 周海辉付健王祥瑞岳敏
Owner BTR NEW MATERIAL GRP CO LTD
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