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Lithium ion battery graphite negative electrode material and preparation method thereof

A lithium-ion battery, graphite negative electrode technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problem that low temperature performance needs to be further improved, and achieve the effect of reducing charge transfer resistance, shortening transmission distance, and accelerating diffusion rate.

Inactive Publication Date: 2020-03-27
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Graphite has always been one of the most commonly used negative electrode materials after the commercialization of lithium-ion batteries, and it is also one of the important factors affecting the low-temperature and rate performance of lithium-ion batteries. The chemical power sources used are extremely needed, such as the batteries used by electric vehicles in winter in northern my country; in order to improve the low temperature and rate performance of graphite-based lithium-ion battery anode materials, researchers have tried many preparation and modification methods, and achieved corresponding results. , for example, patent CN105375030A uses concentrated acid to intercalate micro-expansion modification of natural flake graphite and carbon source coating granulation to improve the low temperature and rate performance of natural graphite, but using strong acid method, there will be many problems in actual industrial production Difficult, and its low temperature performance needs to be further improved

Method used

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  • Lithium ion battery graphite negative electrode material and preparation method thereof
  • Lithium ion battery graphite negative electrode material and preparation method thereof
  • Lithium ion battery graphite negative electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The needle coke raw material is crushed and shaped by a pulverizer and a shaping machine. After shaping, the particle size D50 is 3.5 μm, D90 is 8.1 μm, and D100 is 17.2 μm. Weigh 10 kg of needle coke shaping raw material and 22 g of copper powder , 10g of nano-conductive carbon and 900g of high-temperature pitch. After fully mixing the three materials, put them into the bedroom reactor, heat the reactor to 550°C, keep it warm for 3 hours, and take it out after it cools down to room temperature. Take 300g of phenolic resin and fully mix it with the material from the reactor, then heat it at 1200°C for 3 hours for high-temperature coating, and finally hold it at 3000°C for 12 hours for graphitization treatment to obtain a lithium-ion battery with excellent low temperature and rate performance Graphite anode material.

Embodiment 2

[0039] The needle coke raw material is pulverized and shaped by a pulverizer and a shaping machine. After shaping, the particle size D50 is 4.1 μm, D90 is 8.6 μm, and D100 is 16.8 μm. Weigh 10 kg of needle coke shaping raw material and 50 g of copper powder , 10g of nano-conductive carbon and 930g of high-temperature pitch. After fully mixing the three materials, put them into the bedroom reactor, heat the reactor to 550°C, keep it warm for 3 hours, and take it out after it cools down to room temperature. Take 280g of phenolic resin and fully mix it with the material from the reactor, then heat it at 1200°C for 3 hours for high-temperature coating, and finally hold it at 3000°C for 12 hours for graphitization treatment to obtain a lithium-ion battery with excellent low temperature and rate performance Graphite anode material.

Embodiment 3

[0041]The needle coke raw material is crushed and shaped by a pulverizer and a shaping machine. After shaping, the particle size D50 is 4.5 μm, D90 is 9.2 μm, and D100 is 18.5 μm. Weigh 10 kg of needle coke shaping raw material and 18 g of copper powder , 2.5g of nano-conductive carbon and 480g of high-temperature pitch. After fully mixing the three materials, put them into the bedroom reactor, heat the reactor to 550°C, keep it warm for 3 hours, and take it out after it cools down to room temperature. Take 450g of phenolic resin and fully mix it with the material from the reactor, then heat it at 1200°C for 3 hours for high-temperature coating, and finally heat it at 3000°C for 12 hours for graphitization treatment to obtain a lithium-ion battery with excellent low temperature and rate performance Graphite anode material.

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Abstract

The invention discloses a lithium ion battery graphite negative electrode material and a preparation method thereof. In the graphite negative electrode material of the lithium ion battery, D50 is 7.5-8.5 mum, D90 is 14-16 mum, and D100 is 21-26 mu-m; and the BET specific surface area of the lithium ion battery graphite negative electrode material is 2.0-2.3 m <-2-> / g, and the tap density is 1.0-1.2 g / cm <-2->. The lithium ion battery graphite negative electrode material prepared by the invention has excellent low temperature and rate capability; the primary particles with smaller particles canbe bonded through secondary granulation; the transmission distance of lithium ions in graphite crystals is shortened, the surfaces of graphite particles can be coated with copper powder and nano conductive carbon after the graphitization process, the charge transfer impedance of the surface of graphite is effectively reduced, adopted resin becomes amorphous carbon after the coating and graphitization processes, and the diffusion rate of the lithium ions is effectively increased.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials, and in particular relates to a lithium ion battery graphite negative electrode material and a preparation method thereof. Background technique [0002] In recent years, the energy crisis and environmental protection have increasingly become the two major concerns of people. All countries are actively looking for and developing non-polluting, renewable new energy and energy storage systems. Lithium-ion batteries are environmentally friendly and have a long cycle life. The advantages of high energy density and high energy density have been extensively and deeply studied. At present, lithium-ion batteries are widely used in mobile phones, notebooks, electric vehicles and other fields; as the international competition situation continues to intensify, chemical power sources under extreme conditions have gradually attracted the attention of various countries, especially lithium ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M4/62H01M10/0525
CPCH01M4/587H01M4/625H01M4/626H01M10/0525H01M2004/027Y02E60/10
Inventor 王叶林少雄蔡桂凡毕超奇王健石永倩梁栋栋赵宇飞刘盛华
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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