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Composite plumbago-carbon negative pole material and method of manufacturing the same

A technology of composite graphite and negative electrode materials, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of poor fast charge and discharge performance, long lithium ion diffusion path, low raw material utilization rate, etc., and achieve good high current charge and discharge performance , The preparation method is environmentally friendly and the treatment cost is low

Active Publication Date: 2008-12-10
福建杉杉科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the defects of these modification methods are very obvious
For example, due to the good crystallinity of graphite and well-developed layer orientation, lithium ions are only allowed to intercalate and extract along the boundaries of graphite. Therefore, these modification methods have a long diffusion path for lithium ions and are not suitable for high-current charging and discharging; the raw material particles used in these methods are generally relatively small. Large, obvious anisotropy, so the rapid charge and discharge performance is poor; the raw material utilization rate of these methods is low, and the general shaping yield is only about 50%; these methods are based on raw material shaping treatment, in order to pursue better Sphericity, troublesome processing procedures, increased processing costs

Method used

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  • Composite plumbago-carbon negative pole material and method of manufacturing the same
  • Composite plumbago-carbon negative pole material and method of manufacturing the same
  • Composite plumbago-carbon negative pole material and method of manufacturing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Weigh 90 kilograms (kg) of petroleum coke micropowder (Fushun Longpeng Chemical Co., Ltd., D 50 1 μm) and 30 kilograms of coal tar pitch (Anshan Iron and Steel Co., Ltd.), were added to the reactor alternately while stirring, and continued to stir for 1 hour after feeding, and then under nitrogen protection (nitrogen flow rate 0.1m 3 / h), the temperature was raised to 500°C at a rate of 1°C / min, and kept at a constant temperature of 500°C for 300 minutes, and then the reaction product was cooled to room temperature before conventional graphitization (2800°C), and the prepared composite artificial graphite The average particle size of the carbon negative electrode material is 6 μm, and the specific surface area measured by the BET (Brunauer-Enmet-Teller) method, that is, the low-temperature nitrogen adsorption method, is 2.5 m 2 / g, the half-cell capacity is 338mAh / g, and the first-time efficiency is 93.0%.

[0042] Use the composite graphite as the negative electrode, ...

Embodiment 2

[0044] Take by weighing 120kg petroleum coke micropowder (Huludao City, Liaoning Huayu Carbon Factory, D 50 15 μm) and 10kg of petroleum pitch (Qingzhou Zhenhua Chemical Co., Ltd., Shandong Province), were added to the reactor alternately while stirring, and continued to stir for 0.1 hour after feeding, and then under nitrogen protection (nitrogen flow 0.5m 3 / h), heat up to 550°C at a rate of 0.6°C / min, and keep the temperature at 550°C for 60 minutes, then cool the reaction product to room temperature and then perform conventional graphitization (3000°C) to obtain the composite of the present invention The average particle size of the artificial graphite carbon negative electrode material is 18 μm, and its electron microscope photo is as follows figure 2 As shown, it can be seen that the composite graphite material particles are uniform without agglomeration, and the specific surface area measured by the BET method is 1.8m 2 / g, the half-cell capacity is 347mAh / g, and the ...

Embodiment 3

[0047] Weigh 80kg artificial graphite powder (D 50 10 μm, Qingdao Aoke Graphite Products Factory) and 20kg coal tar (Anshan Iron and Steel Co., Ltd.), while stirring, add in the reaction kettle alternately, continue to stir for 2 hours after feeding, and then under nitrogen protection (nitrogen flow 2m 3 / h), heat up to 500°C at a rate of 1.5°C / min, and keep the temperature at 500°C for 210 minutes, then cool the reaction product to room temperature and then perform conventional graphitization (2600°C) to obtain the composite of the present invention The average particle size of the artificial graphite carbon negative electrode material is 18μm, and the specific surface area measured by the BET method is 1.3m 2 / g, the half-cell capacity is 345mAh / g, and the first-time efficiency is 93.5%.

[0048] Use this composite graphite as negative electrode, lithium cobalt oxide as positive electrode, 1M-LiPF6EC: DMC: EMC = 1: 1: 1 solution as electrolyte to assemble a full battery, th...

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Abstract

The invention discloses a method for preparing a composite graphite carbon cathode material, comprising the following steps that: 1. a step of adding and mixing materials, during which fine carbon powder and a caking agent with a weight ratio between 2:1 and 20:1 are added alternately in the stirring process, the mixture is stirred for 0.1 to 3 hours after adding the materials, the caking agent is selected from a thermoplasticity resin, asphalt and coal tar; 2. a step of increasing the temperature, during which the temperature is increased up to between 450 and 600 DEG C with a rate of 0.5 to3 DEG C per minute; 3. a step of keeping the temperature, during which the temperature of between 450 and 600 DEG C is kept constant for 1 to 10 hours; 4. a step of cooling to the room temperature; and 5. a step of graphitzation; wherein, the steps of 1 to 4 are performed without the protection of oxidation. The raw materials have high operating factor; the preparation method is environment-friendly and easy to implement; moreover, the composite graphite powder prepared has good isotropic properties and the characteristics of good high current performance, long cycle and low nonreversible capacity.

Description

technical field [0001] The invention relates to the field of carbon negative electrode materials, in particular to a composite graphite carbon negative electrode material that can be used for lithium ion batteries and a preparation method thereof. Background technique [0002] In recent years, lithium-ion batteries have been widely used in many industries due to their excellent performance in terms of high energy density, high voltage, no pollution, long cycle life, fast charge and discharge, and decreasing production costs. . With the rapid development of global electronic information industries such as mobile communications, laptop computers, and digital cameras, the requirements for miniaturization, light weight, multi-function, and long-time driving of various products continue to increase. Naturally, lithium-ion secondary batteries The requirements are also gradually increasing, and the requirements for high performance such as large capacity, fast charging, and high e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/524C04B35/622H01M4/38
CPCY02E60/10
Inventor 吴志红冯苏宁丁晓阳于宪乔永民
Owner 福建杉杉科技有限公司
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