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Lithium ion battery cathode composite material and preparation method thereof

A lithium-ion battery and composite material technology, which is applied in the field of composite lithium-ion battery negative electrode materials and its preparation, can solve problems such as low compaction density, reduced electrical conductivity, and increased cost of negative electrode materials, and achieve a firm and dense coating layer , The effect of reducing the manufacturing cost and reducing the dosage

Active Publication Date: 2010-12-15
BTR NEW MATERIAL GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] In the prior art, the method for preparing the negative electrode material of lithium ion battery is to use high-purity spherical graphite whose shape is close to spherical, and the carbon content is as high as 99.9% or more as raw material, and adopts complicated preparation technology, including multi-phase coating method, doping method, etc. Graphite, the process of these methods is complicated, which inevitably increases the cost of the negative electrode material of lithium-ion batteries
Adopt the negative electrode material of the lithium ion battery that the method for prior art prepares simultaneously, compaction density is not high, the electrical conductivity of negative electrode material reduces under high-density compaction condition, has influenced the cycle life and the stability of lithium ion battery, also affects The development process of lithium-ion batteries to high energy density

Method used

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  • Lithium ion battery cathode composite material and preparation method thereof
  • Lithium ion battery cathode composite material and preparation method thereof
  • Lithium ion battery cathode composite material and preparation method thereof

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preparation example Construction

[0021] The preparation method of lithium ion battery negative electrode composite material of the present invention comprises the following steps:

[0022] 1. Graphitization treatment or graphite purification treatment, the carbon content is 85-99.8%, the average particle size is D 50 Spherical, massive and / or flaky natural flake graphite, microcrystalline graphite, crystalline vein graphite or needle coke, petroleum coke raw materials with a spherical shape of 3.0-50 μm and a long-short axis ratio of 1.0-4.5, after purification Or graphitization treatment to obtain a graphite matrix with a carbon content of more than 99.9%. Graphite with a carbon content of 99.9% can also be treated without graphitization or graphite purification.

[0023] Graphitization treatment is to use natural flake graphite, microcrystalline graphite, crystalline vein graphite or needle coke or petroleum coke raw materials with a carbon content of 85-99.8% at a temperature of 1-20°C / min. The heating r...

Embodiment 1

[0044] Example 1, mixing irregular natural flake graphite with a carbon content of 95.2% and 0.5wt% organic high molecular polymer PVA in a liquid phase, and drying the mixture in an instant in the gas phase; The magnetic machine is demagnetized, packed and put into storage.

[0045] Such as figure 1 As shown, after coating with high molecular polymer, the coating layer is uniform, and there is no adhesion between particles.

[0046] Such as figure 2 It can be seen that, while the amount of binder is reduced, the gram capacity of the coated material is still 370.9mAh / g.

[0047] Such as image 3 As shown, the compaction of the pole piece is 1.75g / cm 3 Under the compacted density, the capacity retention rate of the battery for 500 cycles is 86.8%.

Embodiment 2

[0048] Example 2, mixing irregular graphite with a carbon content of 99.9% and 5wt% organic high molecular polymer PEG liquid phase, and drying the mixture in the gas phase instantly; performing a heat treatment at 900°C, and demagnetizing the resultant through a demagnetizer, Packaging and storage.

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Abstract

The invention discloses a lithium ion battery cathode composite material and a preparation method thereof. The invention aims to lower the cost of the cathode material of the lithium ion battery and enhance the conductivity thereof. Graphite is used as the substrate of the material, and an organic polymer and / or high molecular conducting polymer are / is coated outside the substrate. The preparation method comprises the following steps: purifying or graphitizing natural crystalline flake graphite, microcrystal graphite, crystallized veined graphite or needle coke and petroleum coke to obtain the graphite substrate, mixing the graphite substrate and the organic high molecular polymer and / or high molecular conducting polymer liquid phase, spray-drying, and carrying out oven-drying to obtain the lithium ion battery cathode composite material. Compared with the prior art, the invention has the advantages of simplified technique, firmer and more compact coating layer, and stable circulation of the lithium ion battery; the powder resistivity is below 7*10<-6> omega m; and when the material is used for manufacturing the pole piece of the battery, the use amounts of adhesive and conducting agent are reduced in the pole piece manufacturing process, thereby lowering the battery cost.

Description

technical field [0001] The invention relates to a lithium ion battery carbon negative electrode material and a preparation method thereof, in particular to a composite lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] In the prior art, the method for preparing the negative electrode material of lithium ion battery is to use high-purity spherical graphite whose shape is close to spherical, and the carbon content is as high as 99.9% or more as raw material, and adopts complicated preparation technology, including multi-phase coating method, doping method, etc. Graphite, the process of these methods is complicated, which inevitably increases the cost of the negative electrode material of the lithium ion battery. Adopt the negative electrode material of the lithium ion battery that the method for prior art prepares simultaneously, compaction density is not high, the electrical conductivity of negative electrode materi...

Claims

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Application Information

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