Negative electrode material preparation method, negative electrode material, negative electrode piece and lithium ion battery

A negative electrode material, ionic liquid technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of blocking lithium ion transmission, large specific surface area of ​​materials, and impact on battery life, so as to improve the charging rate and service life, avoid The effect of huge specific surface area, easy production and commercial use

Inactive Publication Date: 2018-05-22
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, graphene has defects such as huge specific surface area and easy agglomeration. If it is used in lithium-ion batteries, it will reduce the service life of the battery, block the transmission of lithium ions, low efficiency for the first time, and the electrode sheet cannot be prepared. It is currently not commercially available.
[0004] The patent US8580432B2 provides a negative electrode material. The application is to mix and granulate nano-graphene sheets, nano-negative electrode materials and carbon source materials, and then carbonize to obtain carbon-coated nano-graphene and nano-negative electrode material particles. However, graphene in this material is st

Method used

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  • Negative electrode material preparation method, negative electrode material, negative electrode piece and lithium ion battery
  • Negative electrode material preparation method, negative electrode material, negative electrode piece and lithium ion battery
  • Negative electrode material preparation method, negative electrode material, negative electrode piece and lithium ion battery

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preparation example Construction

[0051] The preparation method of the negative electrode material provided by the application is described in detail below, and the specific steps of the method include:

[0052] Step 110 , mixing and heating the inner core material with the heteroelement-containing polymer or the heteroelement-containing ionic liquid, so that the heteroelement-containing polymer or the heteroelement-containing ionic liquid coats the inner core material.

[0053] Specifically, in step 110, the core material is mixed with a heteroelement-containing polymer or a heteroelement-containing ionic liquid and heated. For example, a protective gas can be passed into the coating kettle, and the protective gas can be nitrogen. Or other inert gas, and carry out coating treatment at 100-250°C, so that the polymer containing heteroelement or ionic liquid containing heteroelement coats the core material, that is, the polymer coated with heteroelement is obtained or core materials for ionic liquids containing ...

Embodiment 1

[0170] Embodiment 1. Taking graphite as the core material, functionalized graphene is selected from aminated graphene, and the polymer containing heteroelements is selected from polypyrrole as an example for illustration. The specific steps are as follows:

[0171] Step 201, preparation of aminated graphene: at room temperature, take a mixture of 360ml of sulfuric acid and 40ml of phosphoric acid, slowly add 10g of natural graphite to the mixture, then add 18g of potassium permanganate into the mixture, and control the addition speed , so that the reaction temperature is controlled between 35 and 40°C. After the addition is complete, stir for 12 hours when the system is warming up to 50°C. After the reaction system is cooled to room temperature, introduce 30w% hydrogen peroxide dissolved in 3ml into the reaction solution 400ml of ice water solution, the mixed solution was filtered, the filter residue was washed with 30w% hydrochloric acid, and diluted with distilled water to pH...

Embodiment 2

[0175] Embodiment 2. Taking graphite as the core material, functionalized graphene is selected from aminated graphene, and the ionic liquid containing heteroelements is selected from triphenyl borate as an example for illustration. The specific steps are as follows:

[0176] Step 301, preparation of a negative electrode material doped with carbon-fixed graphene and coated graphite: in a dry atmosphere, 500 g of triphenyl borate and 2 kg of expanded graphite are placed in a coated kettle, under the protection of an inert gas, at a temperature of Stir at 200°C for 3 hours, after uniform mixing, add aminated graphene at a mass ratio of graphite:aminated graphene of 100:10, maintain the temperature of the coating kettle at 200°C, stir for 3 hours, and cool out of the kettle . Obtain triphenyl borate immobilized aminated graphene-coated graphite, place the obtained triphenyl borate immobilized aminated graphene-coated graphite in an atmosphere sintering furnace, feed nitrogen, and ...

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Abstract

The invention provides a negative electrode material preparation method, a negative electrode material, a negative electrode piece and a lithium ion battery. The negative electrode material preparation method comprises the following steps: mixing and heating a core material and a heteroelement-containing polymer or a heteroelement-containing ionic liquid; mixing and heating the core material coated with the heteroelement-containing polymer or the heteroelement-containing ionic liquid and functionalized graphene; and sintering the functionalized graphene, the heteroelement-containing polymer orthe heteroelement-containing ionic liquid and the core material to obtain the negative electrode material with the surface of the core material being fixedly coated with the graphene by doping carbon. The negative electrode material preparation method allows the negative electrode material with the core material coated with doped carbon fixed graphene to be obtained through fixing graphene by doping carbon, so graphene is stably fixed on the surface of the core material, and graphene agglomeration is avoided.

Description

technical field [0001] The present application relates to the field of lithium ion batteries, and more specifically, relates to a method for preparing negative electrode materials, negative electrode materials, negative electrode sheets and lithium ion batteries. Background technique [0002] With the popularity of electronic products in recent years, lithium batteries as their power sources have become more and more popular due to their advantages such as light weight, small size, high working voltage, high energy density, high output power, high charging efficiency and no memory effect. Pay attention to. However, due to the bottleneck of the energy density of lithium-ion batteries, it has been criticized by users. In view of the fact that the energy density bottleneck of lithium-ion batteries is not easy to break through, researchers are now focusing on the fast charging performance of lithium-ion batteries as the current main research direction, and strive to make the pe...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/0525H01M4/133
CPCH01M4/133H01M4/366H01M4/587H01M4/628H01M10/0525Y02E60/10
Inventor 李慧雷丹夏圣安
Owner HUAWEI TECH CO LTD
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