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Composite graphite material and preparation method thereof and lithium-ion battery comprising composite graphite material

A composite graphite and graphitization technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of increasing side reactions of electrode sheets, long liquid absorption time, and destroying the adhesion of secondary particles, so as to improve liquid absorption performance, high specific capacity, good high current rate performance and cycle performance

Active Publication Date: 2017-05-10
贝特瑞(江苏)新能源材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large number of crushing and crushing processes used in the preparation of the material will destroy the bonding between the secondary particles, and will also produce a lot of active surfaces, which will increase the side reactions of the electrode sheet during the charge and discharge process. In addition, the absorption of the product liquid time is still longer

Method used

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  • Composite graphite material and preparation method thereof and lithium-ion battery comprising composite graphite material
  • Composite graphite material and preparation method thereof and lithium-ion battery comprising composite graphite material
  • Composite graphite material and preparation method thereof and lithium-ion battery comprising composite graphite material

Examples

Experimental program
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Effect test

Embodiment 1

[0071] Natural spherical graphite (D50=6μm~8μm, S50=0.80~0.95) is placed in a rotary kiln, and oxygen is introduced, oxidized at 600°C for 2h, and the oxygen flow rate is 10L / h.kg to obtain oxidized natural graphite ( oxidized graphite). According to the mass ratio of 75:25:20, mix oxidized graphite, petroleum coke (D50=6μm~8μm), petroleum pitch, and then 2 Under the atmosphere, put it in a fusion machine at 600°C for mechanical granulation. After 5 hours of mechanical granulation, cool the reaction product to room temperature, and then add silicon carbide (D50=6μm~8μm) particles according to the ratio of 92:8 and mix them evenly , and finally graphitized at 3000°C to obtain a composite graphite material. The SEM picture of the obtained composite graphite material is as follows figure 1 shown.

[0072] Electrochemical performance test:

[0073] Preparation of negative electrode:

[0074] The composite graphite material obtained in Example 1 was used as the negative electro...

Embodiment 2

[0089] Natural spherical graphite (D50=6μm~8μm, S50=0.80~0.95) is placed in a rotary kiln, and oxygen is fed into it, and oxidized at 500°C for 2h, and the oxygen flow rate is 15L / h.kg, to obtain oxidized natural graphite ( oxidized graphite). According to the mass ratio of 75:25:20, mix oxidized graphite, petroleum coke (D50=6μm~8μm), petroleum pitch, and then 2 Under the atmosphere, put it in a fusion machine at 650°C for mechanical granulation. After 5 hours of mechanical granulation, cool the reaction product to room temperature, and then add silicon carbide (D50=6μm~8μm) particles according to the ratio of 95:5 and mix well , and finally graphitized at 3000°C to obtain a composite graphite material.

[0090] Using the same method as in Example 1 to prepare the negative electrode, assemble it into a button battery, and perform a performance test, the particle size, compaction density, and liquid absorption rate indicators obtained from the test are listed in Table 1; the ...

Embodiment 3

[0092] Put natural spherical graphite (D50=6μm~8μm, S50=0.80~0.95) in a box furnace, feed oxygen, oxidize at 500°C for 5h, and the oxygen flow rate is 20L / h.kg to obtain oxidized natural graphite (oxidized graphite). According to the mass ratio of 60:40:20, mix oxidized graphite, petroleum coke (D50=6μm~8μm), and petroleum pitch, and then 2 Under the atmosphere, put it in a fusion machine at 650°C for mechanical granulation. After 5 hours of mechanical granulation, cool the reaction product to room temperature, and then add silicon carbide (D50=6μm~8μm) particles according to the ratio of 95:5 and mix well , and finally graphitized at 3000°C to obtain a composite graphite material.

[0093] Using the same method as in Example 1 to prepare the negative electrode, assemble it into a button battery, and perform a performance test, the particle size, compaction density, and liquid absorption rate indicators obtained from the test are listed in Table 1; the first delithiation spec...

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Abstract

The invention discloses a composite graphite material and a preparation method and application thereof. The method comprises the steps of (1) mixing activated natural graphite, an artificial graphite precursor and asphalt evenly and carrying out fusing and pelletizing in an inert atmosphere; and (2) mixing the fused and pelletized product with a graphitized catalyst evenly and carrying out high-temperature graphitization to obtain the composite graphite material. An electrode plate prepared from the composite graphite material disclosed by the invention has the advantages of high compaction density, a high liquid absorption rate of the electrode plate and good compatibility with an electrolyte, the compaction density is greater than 1.75g / cm<3> and the liquid absorption time is smaller than equal to 60s; furthermore, the further assembled battery is high in capacity and good in rate capability and cycle performance, the initial deintercalation specific capacity is greater than 360.5mAh / g and the initial efficiency is greater than 93.5%; the capacity retention ratio of the finished battery is greater than 85% after 500 charge-discharge cycles at a room temperature.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials, and relates to a composite graphite material, a preparation method thereof and a lithium ion battery containing the composite graphite material. Background technique [0002] Compared with lead-acid and nickel-metal hydride batteries, lithium-ion batteries have the advantages of high energy density, high working voltage, small size, light weight, no pollution, good safety, and long life. They are an ideal energy storage device. In recent years, lithium-ion batteries have developed vigorously in mobile portable devices (mobile phones, notebook computers, digital cameras, tablet computers, etc.), energy storage devices, power grid peak shaving, and vehicle power batteries. However, with the progress of society and With the development of science and technology, people have more and more urgent needs for miniaturized, lightweight and multi-functional devices, and also put forwar...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M10/0525H01M4/583
CPCH01M4/364H01M4/583H01M10/0525Y02E60/10
Inventor 周成坤苗恒潘修军周海辉
Owner 贝特瑞(江苏)新能源材料有限公司
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