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Preparation method of composite graphite, composite graphite and lithium ion battery

A composite graphite and natural graphite technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as inability to improve orientation, and achieve high catalyst utilization, guaranteed specific capacity, and good liquid absorption and retention performance.

Inactive Publication Date: 2015-11-25
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The performance of graphite particles prepared by this method is limited, and the orientation cannot be improved

Method used

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  • Preparation method of composite graphite, composite graphite and lithium ion battery
  • Preparation method of composite graphite, composite graphite and lithium ion battery
  • Preparation method of composite graphite, composite graphite and lithium ion battery

Examples

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preparation example Construction

[0030] The preparation method of composite graphite provided by the invention comprises the steps:

[0031] S1. Provide ultra-fine carbon powder; the ultra-fine carbon powder includes raw coke and / or mesocarbon microspheres;

[0032] S2, mixing ultrafine carbon powder with a binder to obtain a mixture A, mixing the mixture A with a catalyst to obtain a mixture B, and then performing a composite treatment on the mixture B to obtain a precursor;

[0033] S3, performing graphitization treatment on the precursor to obtain a semi-finished product;

[0034] S4, crushing, spheroidizing, covering and sieving the semi-finished product to obtain the composite graphite.

[0035] According to the present invention, the ultrafine carbon powder contains at least raw coke and / or mesocarbon microspheres. Among them, raw coke can be one or more of needle coke raw coke, pitch coke raw coke, homogeneous coke raw coke.

[0036] In the present invention, by preparing composite graphite on the b...

Embodiment 1

[0076] This example is used to illustrate the preparation method of the composite graphite disclosed in the present invention.

[0077] Step 1. Mix the raw coke of the same sex coke and the cooked coke of the needle coke, and use mechanical pulverization and jet pulverization to D 50 4-5μm, get superfine carbon powder.

[0078] Step 2. Add the superfine carbon powder obtained in step 1 to the kneader according to the ratio of homogeneous coke raw coke: needle coke cooked coke: ferric oxide = 30:70:15, heat to 200°C, and dry powder according to mixture A: low temperature Asphalt=100:20 Add molten low-temperature asphalt, knead it for 1 hour, take it out and perform compression molding to obtain a precursor.

[0079] Step 3. Graphitizing the bulk precursor obtained in Step 2 to obtain a semi-finished product.

[0080] Step 4, the semi-finished products obtained in step 3 are sequentially mechanically crushed and sieved to obtain D 50 Composite graphite finished product of 12-...

Embodiment 2

[0083] This example is used to illustrate the preparation method of the composite graphite disclosed in the present invention.

[0084] Step 1. Mix raw homogeneous coke, green needle coke and cooked needle coke raw materials, and use mechanical pulverization and jet pulverization to D 50 4-5μm, get superfine carbon powder.

[0085] Step 2. Add the ultra-fine carbon powder obtained in step 1 into the kneader according to the ratio of homogeneous coke raw coke: needle coke raw coke: needle coke cooked coke: boron trioxide = 30:40:30:15, and heat to 200 ℃, according to the dry powder of mixture A: low-temperature pitch = 100:10, add molten low-temperature pitch, knead for 1 hour, take it out and perform compression molding to obtain a precursor.

[0086] Step 3. Graphitizing the bulk precursor obtained in Step 2 to obtain a semi-finished product.

[0087] Step 4, the semi-finished products obtained in step 3 are sequentially mechanically crushed and sieved to obtain D 50 Compo...

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Abstract

The invention provides a preparation method of composite graphite to overcome the problems that the composite graphite prepared by the method in the prior art is low in energy density, poor in high-rate charge and discharge properties and high in expansion rate in the charging and discharging processes. The preparation method comprises the following steps: (S1) providing ultrafine carbon powder, wherein the ultrafine carbon powder comprises green coke and / or mesophase carbon green microspheres; (S2) mixing the ultrafine carbon powder with a binder to obtain a mixture A, mixing the mixture A with a catalyst to obtain a mixture B, and then carrying out combined treatment on the mixture B to obtain a precursor; (S3) carrying out graphitizing treatment on the precursor to obtain a semi-finished product; and (S4) crushing, spheroidizing, wrapping and sieving the semi-finished product to obtain the composite graphite. Meanwhile, the invention further discloses the composite graphite prepared by the method and a lithium ion battery. The composite graphite provided by the invention is high in energy density, good in liquid absorption and retention properties, good in isotropic property, good in high-rate charge and discharge properties and low expansion rate in the charging and discharging processes.

Description

technical field [0001] The invention relates to a preparation method of composite graphite, composite graphite prepared by the method, and a lithium ion battery comprising the composite graphite. Background technique [0002] In recent years, with the development of mobile communications and portable electronic devices, higher requirements have been placed on the performance of lithium-ion batteries that provide energy. Anode materials have a significant impact on the performance of lithium-ion batteries. Among the existing anode materials, new high-capacity anodes such as Si-based, Sn-based and Al-based have not been popularized and applied due to cost and technical factors. Traditional graphite-based anode materials Because of its stable performance, mature technology, and low cost, it will continue to dominate the anode market for a period of time. [0003] At present, the actual capacity of graphite-based negative electrodes is close to the theoretical capacity, and it ...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M4/1393H01M10/0525
CPCH01M4/1393H01M4/362H01M4/583H01M10/0525Y02E60/10
Inventor 周海辉苗恒潘修军谯渭川
Owner BTR NEW MATERIAL GRP CO LTD
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