Composite graphite cathode material for high-capacity lithium ion battery, and its preparation method

A lithium-ion battery, composite graphite technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of difficult electrolyte, infiltration, high compaction density, etc., to improve the surface state, improve the liquid absorption performance, improve the absorption The effect of liquid properties

Active Publication Date: 2015-06-03
HUZHOU CHUANGYA POWER BATTERY MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Natural graphite material has a perfect crystal structure, and its theoretical capacity can reach 372mAh / g. However, using pure natural graphite as the negative electrode material has some disadvantages. The fluid is arranged in a directional arrangement, and lithium ions cannot enter from the base surface of the graphite but can only enter from the end surface of the graphite; at the same time, the higher compaction density will make it difficult for the electrolyte to penetrate into the interior of the pole piece. Negative electrode material, there will be insufficient electrolyte, which will eventually lead to poor battery performance
[0004]In addition, the materials that have been industrialized include mesophase carbon microsphere negative electrode materials, which have stable structure, good compatibility with electrolyte, and long cycle life and other advantages, but the disadvantage of this type of material is that the capacity is low. The half-battery is made of metal lithium sheet as the counter electrode. The tested capacity is only 330mAh / g, which is not enough to meet the needs of existing high-capacity batteries; The development of modified high-capacity artificial graphite, such as the Chinese patent with publication number CN101552333A (2009-10-07), proposes to use coal-based and / or petroleum-based processing heavy products to be pulverized under an inert atmosphere and then graphitized or carbonized The high-performance artificial graphite material is obtained by processing, and the lithium-ion battery using the carbon negative electrode active material manufactured by this invention has stable properties, excellent cycle performance, outstanding anti-attenuation ability, and high volumetric electrochemical specific capacity; however, compared with natural graphite products, Its capacity is still slightly insufficient; in addition, a high-capacity negative electrode material is disclosed in the Chinese patent with the publication number CN101286560A (2008-10-15), which mentions that Si / G / DC (silicon / natural stone) is coated with lithium salt Ink / amorphous carbon) surface preparation composite material method, the material prepared by this method has the advantages of high specific capacity and good capacity retention rate, but this method has cumbersome process flow, large consumption of raw materials and energy, and high cost , the equipment and process control is also relatively high, and it is difficult to industrialize

Method used

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  • Composite graphite cathode material for high-capacity lithium ion battery, and its preparation method
  • Composite graphite cathode material for high-capacity lithium ion battery, and its preparation method
  • Composite graphite cathode material for high-capacity lithium ion battery, and its preparation method

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Embodiment 1

[0036] In a 50L small reaction kettle, first add carbon raw materials, that is, sequentially add spherical flake natural graphite with an average particle size of 5 μm, a fixed carbon content greater than 85%, and an average particle size of 3 μm. % average particle diameter is 3 μm coal tar processing heavy product, the weight ratio of described natural graphite material and described petroleum processing heavy product is 1:0.1; The described natural graphite material and described coal tar processing heavy product The weight ratio is 1:10; then add the catalytic modification additive silica with a weight ratio of 1:0.02 to the carbon raw material; then raise the temperature of the reactor from room temperature to 350 °C at a heating rate of 0.5 °C / min °C, during the whole heating process, by controlling the steam pressure to keep it at -0.1MPa, under the final temperature condition, keep it for 4 hours, then cool the material and take it out. During the whole production proc...

Embodiment 2

[0039] In a 50L small reactor, first add carbon raw materials, that is, sequentially add spherical flake natural graphite with an average particle size of 17 μm, a fixed carbon content greater than 85%, and an average particle size of 15 μm. % average particle diameter is 15 μm coal tar processing heavy product, the weight ratio of described natural graphite material and described petroleum processing heavy product is 1:9; The described natural graphite material and described coal tar processing heavy product The weight ratio is 1:0.001; then add catalytic modification additives tetramethoxysilane and silicon carbide with a weight ratio of 1:0.2 to the carbon raw material; The room temperature was raised to 450°C. During the entire temperature rise process, the steam pressure was controlled to keep it at 6.0 MPa. Under the final temperature condition, it was kept for 20 hours, and then the material was cooled and taken out. During the whole production process, the equipment is...

Embodiment 3

[0042] In a 50L small reaction kettle, first add carbon raw materials, that is, sequentially add spherical flake natural graphite with an average particle size of 10 μm, a fixed carbon content greater than 85%, and an average particle size of 15 μm. % average particle diameter is 30 μm coal tar processing heavy product, the weight ratio of described natural graphite material and described petroleum processing heavy product is 1:20; The described natural graphite material and described coal tar processing heavy product The weight ratio is 1:0.001; then add the catalytic modification additive iron oxide and zinc chloride with the weight ratio of 1:0.1 to the carbon raw material; Rising to 800°C, during the entire heating process, by controlling the steam pressure, keep it at 4.0 MPa, and keep it at the final temperature for 20 hours, then cool the material and take it out. During the whole production process, the equipment is in a stirring state, so that the whole material maint...

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Abstract

The invention relates to a composite graphite cathode material for a lithium ion battery, and its preparation method, mainly relates to a composite graphite cathode material for a high-capacity lithium ion battery, and its preparation method, and belongs to the field of cathode materials for the lithium ion battery. The composite graphite cathode material for the high-capacity lithium ion battery is formed by blocky powder and spheroidic powder, and is characterized in that the specific surface area is 1.5-3.5m<2> / g, the average particle size is 7-30mum, the Raman ratio R is 0.1-0.3, and the interlamellar spacing of a crystal face (002) is 0.335-0.337nm. The composite graphite cathode material for the lithium ion battery has the advantages of excellent compact density, excellent gram specific capacity and excellent cycle stability, so the energy density per unit volume of the lithium ion battery is improved, and the electrical performances of the cathode material in the lithium ion battery are comprehensively improved.

Description

technical field [0001] The invention relates to a composite graphite negative electrode material for lithium ion batteries, mainly relates to a composite graphite negative electrode material for high capacity lithium ion batteries and a preparation method thereof, and belongs to the field of negative electrode materials for lithium ion batteries. Background technique [0002] In recent years, the application fields of lithium-ion batteries have been continuously expanded, including mobile phones, cameras, notebook computers, electric bicycles, electric vehicles and energy storage equipment, etc., so the development of lithium-ion battery materials is also being developed in depth. [0003] At present, the anode materials for lithium-ion batteries that have been commercialized are mainly carbon anode materials based on various types of graphite. Graphite material has the advantages of high specific capacity, good safety and low price as the negative electrode material of li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/583
CPCY02E60/10
Inventor 郭雷刘锐剑吕猛胡博
Owner HUZHOU CHUANGYA POWER BATTERY MATERIALS
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