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Method for producing carbon cathode material of composite coated lithium ion battery

An ion battery and negative electrode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as increased internal resistance, and achieve the effects of high production efficiency, high capacity and simple production process

Active Publication Date: 2013-12-11
大连宏光锂业有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a production method of composite coated lithium-ion battery carbon negative electrode material to overcome the defect of increased internal resistance caused by simply using a large proportion of asphalt or phenolic resin coating

Method used

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  • Method for producing carbon cathode material of composite coated lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Weigh the particle size D 50 350g asphalt raw material A 50 350 grams of boron raw material B < 5 μm, air flow mixing at room temperature for 30 minutes.

[0016] Take by weighing 640 grams of the mixture of above-mentioned asphalt raw material A and boron raw material B, and particle diameter D 50 Mix 7360g of natural graphite raw material C of 10~25μm, stir and mix at 300°C for 90 minutes, then raise the temperature to 450°C, and maintain it for 240 minutes under strong stirring. Continue to slowly raise the temperature to 600°C, keep stirring for 240 minutes, and graphitize at a temperature of 2800°C.

[0017] The LIR2430 button battery was used for the test, and the first discharge capacity of the obtained negative electrode material was 360.2mAh / g, and the first discharge efficiency was 93.2%, as shown in Table 1.

Embodiment 2

[0019] Weigh the particle size D 50 50 <5 μm boron nitride raw material B 150 grams, air flow mixing at room temperature for 30 minutes.

[0020] Take by weighing 480 grams of the mixture of above-mentioned phenolic resin raw material A and boron nitride raw material B, and particle diameter D 50 Mix 7520g of artificial graphite raw material C of 10~25μm, stir and mix at 300°C for 120 minutes, then raise the temperature to 450°C, and maintain it for 300 minutes under strong stirring. Continue to slowly raise the temperature to 600°C, keep stirring for 180 minutes, carry out carbonization at a temperature of 1400°C, and then graphitize at a temperature of 3200°C.

[0021] A LIR2430 button battery was used for the test, and the first discharge capacity of the obtained negative electrode material was 348.4mAh / g, and the first discharge efficiency was 94.0%, as shown in Table 1.

Embodiment 3

[0023] Weigh the particle size D 50 300g asphalt raw material A 50 <5 μm boron nitride raw material B 200 grams, air flow mixing at room temperature for 30 minutes.

[0024] Take by weighing 480 grams of the mixture of above-mentioned asphalt raw material A and boron nitride raw material B, and particle size D 50 Mix 7520 grams of artificial graphite raw material C with a thickness of 10-25 μm, stir and mix at 300°C for 90 minutes, then raise the temperature to 450°C, and maintain it for 240 minutes under strong stirring. Continue to slowly raise the temperature to 600°C, keep stirring for 240 minutes, carry out carbonization at a temperature of 1500°C, and then graphitize at a temperature of 3100°C.

[0025] The LIR2430 button battery was used for the test, and the first discharge capacity of the obtained negative electrode material was 352.6mAh / g, and the first discharge efficiency was 93.1%, as shown in Table 1.

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Abstract

The invention provides a method for producing a carbon cathode material of a composite coated lithium ion battery. Asphalt micro-powder or resin micro-powder is used as a raw material A, boron micro-powder or boron nitride micro-powder is used as a raw material B, and carbon powder with average grain diameter of 10-25mu m, natural graphite powder, artificial graphite powder or a mixture of all is used as a raw material C. The method comprises the following steps: performing gas-flow mixing on the raw materials A and B according to a ratio that A / B equals to (10-90) / (90-10) at a normal temperature state; stirring and mixing at a temperature of 300-600 DEG C according to a proportion that (A+B) / C equals to (3-15) / (97-85); and performing carbonization treatment or graphitization treatment, or graphitization treatment after carbonization treatment. The method has the advantages of good conductivity, high capacity, high discharge efficiency and high production efficiency.

Description

technical field [0001] The invention relates to a production method of a composite coated lithium ion battery carbon negative electrode material, belonging to the technical field of lithium ion battery negative electrode materials. Background technique [0002] With the urgent need of low-carbon, green, and circular economy, the research on new energy power batteries has been developed rapidly. Lithium-ion batteries have high working voltage, stable discharge voltage, good low temperature performance, high specific energy, small self-discharge, and no memory. Effect, environmental friendliness and long working life are the research hotspots in the field of electrochemistry in recent years. Among them, the lithium-ion negative electrode material is an important factor that determines the performance of lithium-ion batteries. Since the Japanese SONY company first used pitch coke as the lithium-ion battery negative electrode material in 1989, with the rapid development of lithi...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/1393
CPCY02E60/10
Inventor 王丽琼叶涛蔡奉翰单秉福
Owner 大连宏光锂业有限责任公司