Preparation method of high-rate fast-rapid graphite

A high-magnification, graphite technology, applied in the direction of graphite, chemical instruments and methods, structural parts, etc., can solve the problems of poor fast charge and discharge performance, long diffusion path of lithium ions, and increased processing costs, and achieve excellent comprehensive performance and preparation methods Simple and feasible, the effect of stable product properties

Pending Publication Date: 2017-07-25
SHANGHAI SHANSHAN TECH CO LTD
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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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  • Preparation method of high-rate fast-rapid graphite
  • Preparation method of high-rate fast-rapid graphite
  • Preparation method of high-rate fast-rapid graphite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1. Crushing and shaping processing of petroleum coke raw materials, the particle size D50 is controlled at 5-10 μm;

[0033] 2. Mixing the pulverized petroleum coke raw material with petroleum tar as a modifier with a mass ratio of 90:10;

[0034] 3. Under the protection of inert gas, conduct graphitization high temperature treatment at 3000°C for 48 hours;

[0035] 4. Mix the graphitized high-temperature-treated mixture with petroleum pitch as a binder; the amount of petroleum pitch added is 20% of the quality of the petroleum coke raw material;

[0036] 5. Under the protection of inert gas, conduct low-temperature heat treatment at 600°C for 18 hours, and then cool to room temperature;

[0037] 6. Carry out carbonization heat treatment at 1300°C for 30 hours under the protection of inert gas;

[0038] 7. Mixing and screening to produce high-rate fast-charging graphite with a half-battery capacity of 355.5mAh / g and a charge-discharge rate of >10C / 10C.

Embodiment 2

[0040] 1. Crushing and shaping processing of petroleum coke raw materials, the particle size D50 is controlled at 5-10 μm;

[0041] 2. Mix petroleum coke raw materials and coal tar as a modifier in a mass ratio of 70:30;

[0042] 3. Under the protection of inert gas, conduct graphitization high-temperature treatment at 3200°C for 24 hours;

[0043] 4. Mix in petroleum asphalt as a binder, and the amount of petroleum asphalt added is 30% of the quality of petroleum coke raw materials;

[0044] 5. Under the protection of inert gas, conduct low-temperature heat treatment at 800°C for 10 hours, and cool to room temperature;

[0045] 6. Carry out carbonization heat treatment at 2000°C for 10 hours under the protection of inert gas;

[0046] 7. Mixing and screening to produce high-rate fast-charging graphite with a half-battery capacity of 357.5mAh / g and a charge-discharge rate of >10C / 10C.

Embodiment 3

[0048] 1. Crushing and reshaping the pitch coke raw material, the particle size D50 is controlled at 5-10 μm;

[0049] 2. Mix pitch coke raw material and coal tar as a modifier in a mass ratio of 50:50;

[0050] 3. Under the protection of inert gas, conduct graphitization high temperature treatment at 2800°C for 36 hours;

[0051] 4. Mix in coal tar pitch as a binder, and the amount of coal tar pitch added is 10% of the mass of the pitch coke raw material;

[0052] 5. Under the protection of inert gas, conduct low-temperature heat treatment at 300°C for 20 hours, and cool to room temperature;

[0053] 6. Carry out carbonization heat treatment at 800°C for 50 hours under the protection of inert gas;

[0054] 7. Mixing and screening to produce high-rate fast-charging graphite with a half-battery capacity of 355.0mAh / g and a charge-discharge rate of >10C / 10C.

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Abstract

The invention relates to the technical field of a lithium ion secondary battery, in particular to a preparation method of high-rate fast-rapid graphite. The preparation method is characterized by comprising the following steps of (1) smashing and shaping a raw material; (2) mixing; (3) performing graphitization high-temperature processing, in which graphitization high-temperature processing is performed on the mixed material for 24-48 hours at 2,800-3,200 DEG C under protection of inert gas; (4) mixing the materials; (5) performing low-temperature thermal treatment; (6) performing carbonization thermal treatment; and (7) screening the mixed material. compared with the prior art, the preparation method has the advantages that the graphite is high in charge-discharge rate, large in discharge capacity and good in cycle performance, a button cell prepared from the graphite has excellent comprehensive performance and has main following advantages of relatively good large-current charge-discharge performance, good electrochemical performance, good cycle property, relatively high safety, relatively good adaptability to an electrolyte and other additives and stable product characteristic, the charge-discharge rate can reach over 10C, and the preparation method is suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of lithium-ion secondary batteries, in particular to a preparation method of high-rate fast-charging graphite. Background technique [0002] In recent years, with the miniaturization of electronic devices, there has been an increasing demand for secondary batteries with high capacity and high rate. Of particular interest are lithium-ion batteries, which have a higher energy density than nickel-cadmium or nickel-metal hydride batteries. Although extensive research has been conducted on improving the battery capacity, the charge-discharge rate of the battery needs to be further increased as the requirements for the power density of the battery increase. [0003] As negative electrode materials for lithium ion batteries, granular materials such as metals or graphite have been studied. As the demand for power EV batteries increases, there is a particular need for negative electrode materials that can be used a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/0525C01B32/205C01B32/21
CPCH01M4/366H01M4/587H01M4/628H01M10/0525Y02E60/10
Inventor 谢秋生仲林陈然陈志明薄维通
Owner SHANGHAI SHANSHAN TECH CO LTD
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