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Lithium ion battery negative electrode material, preparation method thereof and lithium ion battery

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem that lithium-ion batteries cannot have high-temperature performance and low-temperature performance at the same time

Active Publication Date: 2018-10-16
BYD CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The present invention aims to solve the problem that the existing lithium-ion battery cannot have good high-temperature performance and low-temperature performance at the same time, and provides a lithium-ion battery negative electrode material, a preparation method of the lithium-ion battery negative electrode material, and a lithium-ion battery negative electrode material. obtained lithium-ion battery

Method used

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  • Lithium ion battery negative electrode material, preparation method thereof and lithium ion battery
  • Lithium ion battery negative electrode material, preparation method thereof and lithium ion battery
  • Lithium ion battery negative electrode material, preparation method thereof and lithium ion battery

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preparation example Construction

[0038] The present invention also provides a method for preparing a lithium ion battery negative electrode material, which includes:

[0039] (1) Oxidize graphite particles to obtain graphite oxide particles;

[0040] (2) adding the graphite oxide particles in step (1) into the hydrolyzed silane coupling agent, and reacting to obtain graphite particles with silanized surfaces;

[0041] (3) polymerizing the graphite particles silanized on the surface in step (2) with olefin sulfonate to form a polymer film on the surface of the graphite particles;

[0042] (4) Using a lithium salt to modify the polymer film on the surface of the graphite particles in step (3), to obtain graphite particles with a lithium-containing polymer film attached to the surface part or all.

[0043] In the present invention, the graphite oxide particles in step (1) can be obtained commercially, or obtained by oxidizing the surface of the graphite particles, and the oxidation method of the graphite partic...

preparation example 1

[0075] This preparation example is used to illustrate the preparation method of neopentyl vinylsulfonate provided by the present invention.

[0076] 1. Measure 450ml of dichloromethane at room temperature and place it in a 1L three-necked flask, add 15.8g of neopentyl alcohol at the same time, and stir until the neopentyl alcohol is completely dissolved.

[0077] 2. Measure 37.5ml of 2-chloroethanesulfonyl chloride, and add it drop by drop with a constant pressure funnel. Then 58.2ml of pyridine was weighed, added dropwise to the reaction mixture, stirred continuously, and reacted for 2 hours. Cooling with cooling water is required during the reaction, and the temperature is controlled at room temperature.

[0078] 3. After the reaction, filter and wash 3 times with 10% sodium carbonate solution and deionized water. The filtrate was added with excess anhydrous magnesium sulfate to remove alkali, and then heated and distilled to recover the organic solvent.

[0079] 4. Put t...

preparation example 2

[0081] This preparation example is used to illustrate the preparation method of neopentyl propylene sulfonate provided by the present invention. The specific method is the same as that of Preparation Example 1, except that the 2-chloroethanesulfonyl chloride measured in Step 2 of Preparation Example 1 is replaced with an equal volume of 3-chloropropanesulfonyl chloride.

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Abstract

The invention relates to the field of batteries, and particularly discloses a lithium ion battery negative electrode material, a preparation method thereof and a lithium ion battery. Graphite oxide particles are contained in the negative electrode material, a lithium-containing polymer film is attached onto a part of surfaces or all surfaces of the graphite oxide particles, and the lithium-containing polymer film is attached onto the surfaces of the graphite oxide particles by a chemical crosslinking mode. The invention also provides the preparation method of the lithium ion battery negative electrode material. After the surfaces of the graphite oxide particles added into the lithium ion battery negative electrode material are processed by the lithium-containing polymer film, the high-temperature performance and the low-temperature performance of the battery can be simultaneously improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery negative electrode material, a preparation method of the lithium ion battery negative electrode material, and a lithium ion battery obtained from the lithium ion battery negative electrode material. Background technique [0002] With the development of electronic information technology, mobile energy as an electronic device has attracted more and more attention. Among them, lithium-ion batteries are particularly widely used due to their high cost performance. Therefore, it is required to have high adaptability to the environment. [0003] However, under normal circumstances, it is difficult to balance the high-temperature performance and low-temperature performance of lithium-ion batteries. Often, the high-temperature performance is excellent, but the low-temperature performance is not good, or the low-temperature performance is good, but the high-temper...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/62H01M10/0525
CPCH01M4/36H01M4/366H01M4/625H01M10/0525Y02E60/10
Inventor 夏勇亮
Owner BYD CO LTD
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