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Preparation method of high-rate and rapid-charge graphite

A high-magnification, graphite technology, applied in the direction of electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of poor fast charge and discharge performance, long lithium ion diffusion path, troublesome processing procedures, etc., to achieve excellent comprehensive performance and preparation The method is simple and feasible, and the effect of stable product properties

Pending Publication Date: 2017-09-08
NINGBO SHANSHAN NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 and rapid-charge graphite
  • Preparation method of high-rate and rapid-charge graphite
  • Preparation method of high-rate and rapid-charge graphite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1. Pulverize and reshape flake graphite raw materials to obtain flake graphite powder with a D50 particle size of 5-10 μm;

[0033] 2. Mix flake graphite powder and petroleum tar at a mass ratio of 90:10 to obtain a mixture;

[0034] 3. Under the protection of inert gas, the mixture is subjected to graphitization high-temperature treatment at 2800°C for 48 hours;

[0035] 4. After the graphitized high-temperature-treated mixture is sieved through a 100-mesh sieve, the underscreen is mixed with petroleum asphalt, and the amount of petroleum asphalt added is 20wt% of the flake graphite raw material;

[0036] 5. Under the protection of inert gas, conduct low-temperature heat treatment at 600°C for 18 hours, and 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. Mix and sieve to prepare high-rate fast-charging graphite with a D50 particle size of 17.8 μm. Its half-battery capa...

Embodiment 2

[0040] 1. Pulverize and reshape flake graphite raw materials to obtain flake graphite powder with a D50 particle size of 5-10 μm;

[0041] 2. Mix flake graphite powder and coal tar at a mass ratio of 70:30 to obtain a mixture;

[0042] 3. Under the protection of inert gas, the mixture is subjected to graphitization high-temperature treatment at 3000°C for 24 hours;

[0043] 4. After the graphitized high-temperature-treated mixture is sieved through a 100-mesh sieve, the underscreen is mixed with petroleum asphalt, and the amount of petroleum asphalt added is 30wt% of the flake graphite raw material;

[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 sieving to obtain high-rate fast-charging graphite with a D50 particle size of 18.3 μm, a half-cell capacity of...

Embodiment 3

[0048] 1. Pulverize and reshape flake graphite raw materials to obtain flake graphite powder with a D50 particle size of 5-10 μm;

[0049] 2. Mix flake graphite powder and coal tar in a mass ratio of 50:50 to obtain a mixture;

[0050] 3. Under the protection of inert gas, the mixture is subjected to graphitization high-temperature treatment at 2500°C for 36 hours;

[0051]4. After the graphitized high-temperature-treated mixture is screened through a 100-mesh sieve, the undersieve is mixed with coal tar pitch, and the amount of coal tar pitch added is 10 wt% of the flake graphite 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 sieving to obtain high-rate fast-charging graphite with a D50 particle size of 17.4 μm, a half-cell capacity of 360.0...

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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 and rapid-charge graphite. The preparation method is characterized by comprising the following steps of (1) smashing and shaping; (2) mixing a modifying agent; (3) performing graphitization high-temperature processing; (4) mixing an adhesive; (5) performing low-temperature thermal treatment; (6) performing carbonization thermal treatment; and (7) screening a mixture. Compared with the prior art, the graphite has the advantages of high charge-discharge rate, large discharge capacity and good cycle performance; and the prepared button cell is excellent in integral performance and mainly has the following advantages that 1, the large-current charge-discharge performance is relatively good; 2, the electrochemical performance is good; 4, the cycle property is good; 5, the safety is relatively good; 6, the adaptability to an electrolyte and other additives is relatively good; and 7, the product property is stable, and the button cell 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): H01M4/36H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 谢秋生仲林陈然陈志明薄维通
Owner NINGBO SHANSHAN NEW MATERIAL TECH
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