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Cell anode material and preparation method thereof

A battery negative electrode and manufacturing method technology, applied to battery electrodes, secondary batteries, circuits, etc., can solve problems such as deteriorating cycle performance, low yield, and damage to the coating layer

Active Publication Date: 2015-07-29
四川金泰能新材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method needs to be pulverized in the later stage of the preparation process. On the one hand, it will destroy the formed coating layer and deteriorate the cycle performance; on the other hand, a large amount of ultrafine powder that is not suitable for lithium-ion battery negative electrode materials will be produced during the pulverization process , the final yield is lower

Method used

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  • Cell anode material and preparation method thereof
  • Cell anode material and preparation method thereof

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preparation example Construction

[0046] The preparation method of pole piece used in the present invention is: in carboxymethyl cellulose (CMC) aqueous solution, add super conductive carbon black SP, stir; Add graphite sample, stir; Add styrene-butadiene rubber (SBR), stir; On the coating machine, the slurry is evenly coated on the copper foil to make pole pieces, and the density of one side is controlled at 8-9mg / cm 2 Left and right, the double-sided density is controlled at 16-18mg / cm 2 about. Proportion: Graphite: CMC: SP: SBR: H 2 O=96.5:1:1:1.5:110.

[0047] The test method of the button battery is as follows: put the pole piece coated on one side into a vacuum drying oven at a temperature of 110°C for 12 hours in a vacuum, take out the pole piece and roll it on a roller press, and set it aside. The battery was assembled in a German Braun glove box filled with argon, the electrolyte was 1MLiPF6EC:DEC:DMC=1:1:1 (volume ratio), and the metal lithium sheet was used as the counter electrode. Battery mode...

Embodiment 1

[0049] 1) Premixing: Mix natural graphite fine powder with an average particle size D50=8.6 μm and coal-based high-temperature asphalt with an average particle size D50=2.5 ​​μm in a mass ratio of 4:1;

[0050] 2) Reaction: introduce the above mixture into a pressure-resistant heating reaction vessel that can be completely sealed and has a stirring function, start the stirrer, and feed N 2 Replace the air in the reaction vessel for 1 hour; seal the reaction vessel, raise the temperature to 450°C at a rate of 10°C / min, and keep it warm for 4 hours; raise the temperature to 580°C at a rate of 1°C / min, and keep it warm for 2 hours. During the process, the gas generated by the reaction is properly discharged, so that the pressure in the container is controlled at about 0.2 MPa.

[0051] 3) Release the reacted material to vacuum or fill it with N 2 in a container, let cool.

[0052] 4) Under the protection of inert gas, heat treatment at 1100°C for carbonization.

[0053] 5) Gra...

Embodiment 2

[0056] 1) Premixing: Mix natural graphite powder with average particle size D50=8.6μm and coal-based low-temperature pitch with average particle size D50=3.0μm in a mass ratio of 4:1;

[0057] 2) Reaction: introduce the above mixture into a pressure-resistant heating reaction vessel that can be completely sealed and has a stirring function, start the stirrer, and pass Ar to replace the air in the reaction vessel for 1 hour; seal the reaction vessel, and heat up at 10°C / min Increase the speed to 500°C and keep it warm for 4 hours; increase the temperature to 600°C at a rate of 1°C / min and keep it warm for 2 hours. During the process, the gas generated by the reaction is properly discharged, so that the pressure in the container is controlled at about 0.25 MPa.

[0058] 3) Emit the reacted material to a container that is evacuated or filled with Ar, and cooled.

[0059] 4) Under the protection of inert gas, conduct heat treatment at 1200°C for carbonization.

[0060] 5) Sievin...

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Abstract

The invention relates to a cell anode material and a preparation method thereof. The cell anode material comprises primary particles and secondary particles formed through clustering of the primary particles, wherein the primary particles are natural graphite micro powder, and / or artificial graphite micro powder, and / or carbonized or graphitized coke micro powder; the mass content of the secondary particles is 20 to 100 percent; the particle sizes of the cell anode material range from 6 to 60 microns; the average grain diameter D50 is 10 to 25 microns; the specific surface is smaller than 2.5m<2> / g. The anode material prepared according to the method is relatively high in compaction density, relatively low in expansion ratio, and relatively excellent in rate charge-discharge performance.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to a battery negative electrode material and a preparation method thereof. Background technique [0002] The rise of high-end electronic products such as smartphones, tablet computers, ultrabooks, and wearable devices has put forward the requirements of "light, thin, short, and small" for lithium-ion batteries, and the size requirements for lithium-ion batteries have become increasingly stringent. At the same time, as the functions of these electronic products become more and more powerful, there are higher requirements for the battery life of lithium-ion batteries, and the requirements for rapid recharge, energy density, and high-rate charging of batteries are also getting higher and higher. In addition, the launch of smart phones such as Apple uses a built-in battery or an integrated battery configuration, making it impossible to remove and replace the battery. This also puts forw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587
CPCH01M4/1393H01M4/362H01M4/366H01M4/587H01M10/0525Y02E60/10
Inventor 吴泽轶张俊何晓云石九菊吴云胜匡春芳胡晓东蒋勇明郜长福
Owner 四川金泰能新材料有限公司
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