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Anode material for lithium ion power battery and preparation method thereof

A technology of power battery and negative electrode material, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems affecting the development process of lithium-ion power batteries, poor liquid absorption performance of battery negative pole pieces, and affecting the performance of lithium-ion power batteries, etc. Achieve the effect of superior liquid absorption, easy control and high capacity

Inactive Publication Date: 2010-12-15
BTR NEW MATERIAL GRP CO LTD
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Problems solved by technology

[0002] The method for preparing lithium-ion batteries in the prior art is to use high-purity spherical or near-spherical graphite as a raw material, with a carbon content of more than 99.9%, using complex preparation processes, including multi-phase coating steps and doping steps to process graphite, these This method inevitably increases the cost of negative electrode materials, which affects the development process of lithium-ion power batteries
In addition, the negative electrode materials and related preparation methods for lithium-ion power batteries in the prior art cannot overcome the defects of low specific capacity, low rate performance, and poor low-temperature performance of negative electrode materials, and the liquid absorption performance of the prepared battery negative electrode sheet Poor, which affects the further improvement of the performance of lithium-ion power batteries

Method used

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  • Anode material for lithium ion power battery and preparation method thereof
  • Anode material for lithium ion power battery and preparation method thereof
  • Anode material for lithium ion power battery and preparation method thereof

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preparation example Construction

[0020] The preparation method of the negative electrode material that lithium ion battery of the present invention is used comprises the following steps:

[0021] 1. Use the GS-300 high-speed mixer of Wuxi Xinguang Powder Processing Technology Co., Ltd. to mix graphite and the precursor of non-graphite carbon materials with a mass of graphite of 1 to 10.0% with the solvent at a speed of 600 to 2100r / min. The phases are mixed for 10-180 minutes to obtain a suspension liquid mixture with a solid content of 10-70 wt%.

[0022] Graphite is natural graphite powder with a carbon content of 90-99%, and an average particle size of 3.0-39.0 μm.

[0023] The precursors of non-graphite carbon materials are pitch and resin. The pitch is more than one of coal pitch, petroleum pitch, coal tar and emulsified pitch. The resin is furan resin, urea-formaldehyde resin, pyrimidine resin, phenolic resin, epoxy resin, One or more of polymethyl methacrylate resin and acrylic resin.

[0024] The so...

Embodiment 1

[0037] Embodiment 1, adopt spherical natural graphite as raw material, its carbon content is 99%, and 10% asphalt of graphite quality is mixed through liquid phase and rotating speed is 1300r / min, stirs 50min, and solid content is 60%, then through VC mixer, above-mentioned The mixture was coated with a rotating speed of 500r / min for 30 minutes, and then carbonized at 1100°C for 16 hours at a heating rate of 11°C / min, the protective gas was nitrogen, the flow rate was 80L / h, and the temperature was lowered at a cooling rate of 6°C / min. Sift the pack.

Embodiment 2

[0038] Embodiment 2, adopt spherical natural graphite as raw material, its carbon content is 92%, mix with graphite quality 3% asphalt through liquid phase, rotating speed is 2100r / min, stir 10min, solid content is 20%, then through VC mixer The above mixture is coated with a rotation speed of 300r / min, stirred for 15min, and then carbonized at 1800°C for 4 hours at a heating rate of 20°C / min. The protective gas is argon, the flow rate is 10L / h, and the temperature is lowered at a cooling rate of 13°C / min. , sieved packaging.

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Abstract

The invention discloses an anode material for a lithium ion power battery and a preparation method thereof, which aims to solve the technical problem of reducing the cost. The anode material for the lithium ion power battery of the invention takes spherical-like graphite, spheroid graphite with the major-minor axis ratio of 1.0-3.5, blocky graphite and / or flake graphite as a substrate, and non-graphite carbon material is coated outside the substrate to form composite particles. The preparation method comprises the following steps: mixing the precursors of the graphite and the non-graphite carbon material in liquid phase to obtain a suspensoid mixture; mixing and coating to obtain precursors of composite particles; and carbonizing to obtain the anode material for the lithium ion power battery. Compared with the prior art, the anode material for the lithium ion power battery of the invention has the characteristics of high capacity, high efficiency, excellent low-temperature performance, excellent magnification performance, superior absorption performance, simple preparation method and easy control, greatly reduces the cost of the lithium ion power battery, and is suitable for industrial production.

Description

technical field [0001] The invention relates to a carbon negative electrode material for a battery and a preparation method thereof, in particular to a carbon negative electrode material for a power battery and a preparation method thereof. Background technique [0002] The method for preparing lithium-ion batteries in the prior art is to use high-purity spherical or nearly spherical graphite as a raw material, with a carbon content of more than 99.9%, and a complex preparation process, including multi-phase coating steps and doping steps to process graphite, these The method inevitably increases the cost of negative electrode materials, which affects the development process of lithium-ion power batteries. In addition, the negative electrode materials and related preparation methods for lithium-ion power batteries in the prior art cannot overcome the defects of low specific capacity, low rate performance, and poor low-temperature performance of the negative electrode materia...

Claims

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Application Information

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IPC IPC(8): H01M4/133H01M4/1393H01M4/38
CPCY02E60/122Y02E60/10
Inventor 岳敏闫慧青邓明华贺雪琴
Owner BTR NEW MATERIAL GRP CO LTD
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