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Lithium ion battery graphite anode material and preparation method thereof

A lithium-ion battery, graphite anode technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as affecting the coating effect, improve charge-discharge performance and cycle performance, better adaptability, and improve intercalation. The effect of the lithium platform

Inactive Publication Date: 2017-12-15
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above two methods generally require a crushing step, which will affect the coating effect to a certain extent.

Method used

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  • Lithium ion battery graphite anode material and preparation method thereof
  • Lithium ion battery graphite anode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] (1) Mix ammonia water and absolute ethanol evenly, add artificial graphite, and disperse evenly by ultrasonic;

[0028] (2) Warm up the dispersion liquid obtained in step (1) to 40°C, then add tetrabutyl titanate dropwise, the weight ratio of tetrabutyl titanate and artificial graphite is 15:100, heat and stir for 20 hours;

[0029] (3) The reaction solution in step (2) was cooled to room temperature, centrifuged, and the solid product was dried in an oven, placed in a muffle furnace, and sintered at 500° C. for 2 hours to obtain the lithium ion battery graphite negative electrode material.

Embodiment 2

[0031] (1) Mix ammonia water and absolute ethanol evenly, add artificial graphite, and disperse evenly by ultrasonic;

[0032] (2) Warm up the dispersion obtained in step (1) to 40°C, then add tetrabutyl titanate dropwise, the weight ratio between tetrabutyl titanate and artificial graphite is 5:100, and heat and stir for 20 hours;

[0033] (3) The reaction solution in step (2) was cooled to room temperature, centrifuged, and the solid product was dried in an oven, placed in a muffle furnace, and sintered at 500° C. for 3 hours to obtain the lithium ion battery graphite negative electrode material.

[0034] figure 1 It is an electron microscope image of the lithium-ion battery graphite negative electrode material obtained in this example. It can be seen that the original smooth graphite surface is modified with a layer of titanium dioxide.

[0035] In order to test the performance of the lithium ion battery negative electrode material prepared by the present invention, with e...

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Abstract

The invention belongs to the technical field of lithium ion battery materials, and discloses a lithium ion battery graphite anode material and a preparation method thereof. The preparation method is as follows: ammonia and absolute ethyl alcohol are uniformly blended, then added with artificial graphite and ultrasonically dispersed uniformly; the obtained dispersion is heated to 40 DEG C to 50 DEG C, titanate is then dripped, and heating and stirring are carried for reaction for 12 to 24 hours; the obtained reaction liquid is cooled to room temperature, centrifugal separation is carried out, and after being dried, the solid product is sintered under the preserved temperature of 400 DEG C to 500 DEG C for 2 to 4 hours, so that the lithium ion battery graphite anode material is obtained. Modified by titanium dioxide, the anode material disclosed by the invention can remarkably improve the charge and discharge performance and cycle performance of lithium ion batteries; moreover, because the artificial graphite is coated, the compatibility between the anode material and catalyst is better, and thereby the cycle performance of batteries can be enhanced.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery materials, and in particular relates to a lithium-ion battery graphite negative electrode material and a preparation method thereof. Background technique [0002] At present, the anode materials commonly used in the market for lithium-ion batteries are mainly graphite-carbon anode materials, which are divided into several forms such as graphite, hard carbon and soft carbon materials, among which graphite materials are one of the hotspots in lithium-ion battery research. one. Due to the small interlayer spacing of graphite and complete crystallization, on the one hand, it affects the rapid deintercalation of lithium ions during the lithium ion deintercalation process, resulting in slower diffusion of lithium ions in graphite, which limits the high current charge and discharge capacity of lithium ion batteries; On the other hand, the deintercalation of lithium ions will cause about 10% ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/587H01M10/0525
CPCH01M4/366H01M4/483H01M4/587H01M10/0525Y02E60/10
Inventor 曹志桄李伟善
Owner SOUTH CHINA NORMAL UNIVERSITY