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Negative electrode material, preparation method thereof and lithium ion battery

A technology of negative electrode materials and carbon materials, applied in the field of negative electrode materials and their preparation, and lithium-ion batteries, can solve problems such as limited specific capacity effect, achieve the effect of maintaining integrity and improving diffusion performance

Pending Publication Date: 2021-05-07
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has limited effect on increasing the specific capacity

Method used

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  • Negative electrode material, preparation method thereof and lithium ion battery
  • Negative electrode material, preparation method thereof and lithium ion battery
  • Negative electrode material, preparation method thereof and lithium ion battery

Examples

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Embodiment 1

[0075] The present embodiment prepares the negative electrode material according to the following method:

[0076] Weigh 300mg of trishydroxymethylaminomethane into 100mL deionized water, then add dilute hydrochloric acid with a concentration of 0.1mol / L, stir for 20min, adjust the pH value to 8.5, and then immerse 1000mg of natural graphite in the trihydroxymethylaminomethane Add 500mg of dopamine hydrochloride to the aqueous solution of methylaminomethane, and stir at 60°C for 12h to obtain polydopamine-coated natural graphite; add 1000mg of the polydopamine-coated natural graphite obtained above to 100ml deionized water and 10ml alcohol mixed solution, ultrasonically dispersed for 20min, then added 400mg of ZnCl 2 and 300mg of (NH 4 ) 2 C 2 o 4 , stirred for 45min, and then the precipitate was placed in a tube furnace, carbonized at 800°C for 12h, and nitrogen was fed at a constant speed throughout the carbonization process to obtain the negative electrode material (a Z...

Embodiment 2

[0082] The present embodiment prepares the negative electrode material according to the following method:

[0083]Weigh 300mg of trishydroxymethylaminomethane and add it into 100mL deionized water, then add dilute hydrochloric acid with a concentration of 0.1mol / L, stir for 20min, adjust the pH value to 8.5, and then immerse 1000mg of natural graphite in trimethylol In the aqueous solution of aminomethane, add 300mg of dopamine hydrochloride subsequently, stir at 60 ℃ for 12h, obtain polydopamine-coated natural graphite; 1000mg above-mentioned obtained polydopamine-coated natural graphite is added to 100ml deionized water and In the mixed solution of 10ml alcohol, ultrasonically disperse for 20min, then add 400mg of ZnCl 2 and 300mg of (NH 4 ) 2 C 2 o 4 , stirred for 45min, and then the precipitate was placed in a tube furnace, carbonized at 800°C for 12h, and nitrogen was fed at a constant speed throughout the carbonization process to obtain the negative electrode materia...

Embodiment 3

[0087] The present embodiment prepares the negative electrode material according to the following method:

[0088] Weigh 300mg of trishydroxymethylaminomethane and add it into 100mL deionized water, then add dilute hydrochloric acid with a concentration of 0.1mol / L, stir for 20min, adjust the pH value to 8.5, and then immerse 1000mg of natural graphite in trimethylol In the aqueous solution of aminomethane, add 700mg of dopamine hydrochloride subsequently, stir at 60 ℃ for 12h, obtain polydopamine-coated natural graphite; 1000mg above-mentioned obtained polydopamine-coated natural graphite is added to 100ml deionized water and In the mixed solution of 10ml alcohol, ultrasonically disperse for 20min, then add 400mg of ZnCl 2 and 300mg of (NH 4 ) 2 C 2 o 4 , stirred for 45min, and then the precipitate was placed in a tube furnace, carbonized at 800°C for 12h, and nitrogen was fed at a constant speed throughout the carbonization process to obtain the negative electrode materi...

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Abstract

The invention discloses a negative electrode material, a preparation method thereof and a lithium ion battery. The negative electrode material comprises an inner core and a shell coating the surface of the inner core; the inner core comprises a first carbon material, and the shell comprises a second carbon material coating layer and doped nanoparticles located on the second carbon material coating layer. The preparation method comprises the following steps: 1) coating the surface of a first carbon material with a polymer to obtain a polymer-coated material; 2) doping the surface of the polymer coating material with a doping raw material to obtain the polymer coating material with a doped nanoparticle precursor; and 3) carbonizing the polymer coating material with the doped nanoparticle precursor to obtain the negative electrode material. According to the negative electrode material provided by the invention, the second carbon material coating layer is used as a carrier and a buffer layer, so the inherent problem of low specific capacity of a graphite material is solved, and the negative electrode material is good in conductivity, high in capacity, high in first coulombic efficiency and excellent in cycle performance.

Description

technical field [0001] The invention belongs to the technical field of energy storage materials, and relates to a negative electrode material, a preparation method thereof and a lithium ion battery. Background technique [0002] Lithium-ion batteries have been widely used in portable electronic products and electric vehicles because of their advantages such as high working voltage, long cycle life, no memory effect, small self-discharge, and environmental friendliness. At present, commercial lithium-ion batteries mainly use graphite-based negative electrode materials, but its theoretical specific capacity is only 372mAh / g, which cannot meet the needs of future lithium-ion batteries for high energy density. Therefore, how to modify graphite to make it Breaking the limit of intrinsic capacity is considered to be the development direction of graphite anode in the future. [0003] Carbon coating is an effective method to optimize the electrochemical performance of graphite nega...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/587H01M4/62H01M10/0525B82Y30/00
CPCH01M4/587H01M4/483H01M4/628H01M10/0525B82Y30/00H01M2004/027H01M2004/021Y02E60/10
Inventor 张宝煊李子坤杨书展任建国贺雪琴
Owner BTR NEW MATERIAL GRP CO LTD
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