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Putamen type carbon cathode material for lithium ion secondary battery and preparation method thereof

A technology for secondary batteries and negative electrode materials, applied in electrode manufacturing, battery electrodes, circuits, etc., can solve the problems of electrode sensitivity to electrolyte, poor electrode performance, energy consumption, etc., and achieve low initial irreversible capacity, good charge and discharge. performance, the effect of reducing production costs

Inactive Publication Date: 2004-11-17
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, their coating materials will become lumps without exception after carbonization, and the obtained composite materials must be crushed again to obtain anode materials with suitable particle size distribution, which will inevitably destroy the shell layer and make the coated materials The graphite-coated active surface will be partially or completely exposed, causing the electrode to become sensitive to the electrolyte, resulting in poor electrode performance
At the same time, impurities will be mixed during crushing and sieving, which makes the production process more complicated.
[0005] In addition, the preparation of artificial graphite specially used as the negative electrode of lithium-ion batteries requires high-temperature graphitization temperatures as high as 2500-3000 °C, which not only requires large-scale specialized equipment, but also consumes extremely energy, which is not only a consumption of the world's limited energy, but also leads to production Determinants of high cost

Method used

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  • Putamen type carbon cathode material for lithium ion secondary battery and preparation method thereof
  • Putamen type carbon cathode material for lithium ion secondary battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh 76g of artificial graphite with a particle size range of 5-50μm and 120g of medium-temperature coal pitch in a high-pressure reactor and mix them evenly. In a sealed state, heat up to 410℃ and react at a constant temperature for 1 hour, then put it into the reactor Add an appropriate amount of coal tar light component to dissolve the unreacted pitch, hot filter to obtain graphite coated with chemical deposition on the surface, and then further wash with pyridine in a Soxhlet extractor and dry at 60°C for 24 hours, and finally obtain The material was carbonized in a tubular carbonization furnace at 1000°C for 1 hour to obtain samples.

Embodiment 2

[0020] Weigh 76g of artificial graphite with a particle size range of 5-50μm and 120g of petroleum pitch in an autoclave and mix them evenly. In a sealed state, heat up to 410℃ and react at a constant temperature for 0.5 hours, then put it in the reactor Add appropriate amount of washing oil to dissolve the unreacted asphalt, heat it to filter to obtain graphite coated with chemical deposition, and then further wash with toluene in a Soxhlet extractor and dry at 60°C for 24 hours. Finally, the obtained material Samples were obtained by carbonization in a tubular carbonization furnace at 1000°C for 1 hour.

experiment example 1

[0022] In a glove box filled with argon gas and a relative humidity below 2%, the metal foil is used as the counter electrode and the auxiliary electrode, the electrolyte is, and the microporous polypropylene film is used as the diaphragm, and the working electrode prepared in Examples 1 and 2 Make up the experimental battery. The battery charge and discharge performance test is carried out on a constant current charge and discharge instrument. Charge and discharge voltage range: 0.005~2.000V, charge and discharge current density is 20.0mA / g. The results are shown in Table 1 and Table 2.

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Abstract

The invention discloses a kind of kernel shell type carbon negative material of a kind of lithium ion secondary cell and the manufacturing method. The materials are manmade black lead or natural black lead powder with particle size of 5-50ª–m, the shell is carbonized material which uses asphalt thermal fasculation reaction resultants and whose thickness is 0.01-0.2ª–m. The manufacturing method includes: crushing the black lead, the thermal fasculation reaction, rinsing and eliminating the asphalt component and the carbonization process to the covered black lead micro powder. The merits of the invention lie in: the efficiency is high and the circular performance is excellent. The method is simple and the energy consumption is low, and the cost is low.

Description

Technical field [0001] The invention relates to a lithium ion battery negative electrode material, in particular to a lithium ion battery negative electrode carbon material and a preparation method thereof. Background technique [0002] Lithium-ion battery is a brand-new high-energy green battery successfully developed at the end of the 20th century. Compared with traditional batteries, it has the advantages of higher average discharge voltage, larger volume capacity and mass capacity, long discharge time, and light weight. Lithium-ion secondary batteries are rapidly marketed under the direct promotion of carbon materials used as anodes, and graphitized carbon materials are still the mainstream of today's commercial lithium-ion battery anode materials. [0003] However, due to the differences in the source and preparation process of the actual carbon materials, some inherent defect structures and the existence of surface tip atoms may cause the deco...

Claims

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Application Information

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IPC IPC(8): C01B31/00H01M4/38
CPCY02E60/12Y02E60/10
Inventor 张永刚王成扬
Owner TIANJIN UNIV
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