Preparation method of anode material, anode material and lithium battery

A technology of negative electrode material and polar solvent, applied in the field of preparation of negative electrode material, can solve the problems of poor solvent compatibility, poor charging and discharging performance at high current, and poor modification effect, etc.

Active Publication Date: 2019-10-22
微宏先进材料公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of graphite as the negative electrode material of the battery also has the following disadvantages: poor compatibility with solvents, poor high-current charge and discharge performance, and the graphite layer peels off due to the co-embedding of solvent molecules during the first charge and discharge, resulting in reduced electrode life.
However, the disadvantage of resin coating is that the coated product needs to be crushed after heat treatment, and the crushing process may damage the structure of the coating layer to varying degrees, thus making the modification effect worse.

Method used

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  • Preparation method of anode material, anode material and lithium battery
  • Preparation method of anode material, anode material and lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Preparation of negative electrode materials

[0051] 1) Add 4g of polyacrylonitrile powder to 196g of dimethylformamide, and magnetically stir and dissolve to obtain a polyacrylonitrile solution with a mass concentration of 2%, wherein the number average molecular weight of polyacrylonitrile is 130,000, and the stirring speed is 25r / min, the stirring temperature (water bath heating) was 30°C, and the stirring time was 3h.

[0052] 2) Add 20 g of graphite with an average particle size of 13.00 μm into the polyacrylonitrile solution described in step 1), and stir magnetically to obtain a suspension at a stirring speed of 20 r / min, a stirring temperature of 25° C., and a stirring time of 2 h.

[0053] 3) separating the solid-liquid phase of the suspension in step 2) with a centrifuge to obtain the solid phase of the lower layer.

[0054] 4) Add the solid phase described in step 3) into 300mL coagulation bath (deionized water), the temperature of the coagulation bath is 2...

Embodiment 2

[0064] The difference between the preparation of the negative electrode material and Example 1 is that in step 1), 2 g of polyacrylonitrile powder was added to 198 g of dimethylformamide, and magnetically stirred to obtain a polyacrylonitrile solution with a mass concentration of 1%.

[0065] The prepared negative electrode material includes graphite and a hard carbon layer coated on the outer surface of the graphite, wherein the hard carbon layer has a thickness of 50 nm, the average particle size of the negative electrode material is 13.12 μm, and the graphite and The mass ratio of the negative electrode material is 1:1.01.

[0066] The preparation of lithium battery (button cell) is with embodiment one;

[0067] Electrical performance test

[0068] Test condition is with embodiment one;

[0069] Test results: the initial discharge capacity is 366mAh / g, and the initial efficiency can reach 92.3%.

Embodiment 3

[0071] The difference between the preparation of the negative electrode material and Example 1 is that in step 1), 20 g of polyacrylonitrile powder was dissolved in 180 g of dimethylformamide, and magnetically stirred to obtain a polyacrylonitrile solution with a mass concentration of 10%.

[0072]The prepared negative electrode material includes graphite and a hard carbon layer coated on the outer surface of the graphite, wherein the hard carbon layer has a thickness of 800 nm, the average particle size of the negative electrode material is 14.80 μm, and the graphite and The mass ratio of the negative electrode material is 1:1.13.

[0073] The preparation of lithium battery (button cell) is with embodiment one;

[0074] Electrical performance test

[0075] Test condition is with embodiment one;

[0076] Test results: the initial discharge capacity is 369mAh / g, and the initial efficiency can reach 92.5%.

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Abstract

The invention provides a preparation method of an anode material, an anode material and a lithium battery. The preparation method of an anode material comprises the steps of: adding graphite into a polyacrylonitrile solution to obtain a suspension; separating the suspension to obtain a solid phase; adding the solid phase obtained in the step into a coagulating bath to form a precursor of the polyacrylonitrile coated with graphite; and pre-oxidizing and carbonizing the precursor of the polyacrylonitrile coated with graphite to obtain an anode material. The anode material prepared by the preparation method provided by the invention has the good single-particle property, obviously improves the first charge-discharge capacity and the first efficiency of the lithium battery prepared by the anode material.

Description

technical field [0001] The invention relates to a preparation method of a negative electrode material, a negative electrode material and a lithium battery. Background technique [0002] Compared with lead-acid batteries, lithium batteries have the advantages of high energy density, high working voltage, low self-discharge rate, small size, light weight, and long cycle life. They are widely used in various portable electronic devices and electric vehicles. At present, the commercial negative electrode materials for lithium batteries are mainly graphite negative electrode materials, and their theoretical specific capacity is 372mAh / g. However, as the performance requirements for lithium batteries increase, the battery capacity needs to be further increased. Therefore, improving the specific capacity, improving the cycle performance and reducing the irreversible capacity of lithium battery negative electrode materials have been the focus of research and development for a long ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/0525C01B32/21C01B32/05
CPCH01M4/366H01M4/587H01M4/62H01M10/0525C01B32/21C01B32/05Y02E60/10
Inventor 魏冠杰叶炳贤
Owner 微宏先进材料公司
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