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High-conductivity graphene/carbon nanotube composite coating for lithium ion batteries and preparation method thereof

A carbon nanotube composite, lithium-ion battery technology, applied in electrode current collector coating, battery electrode, conjugated diene coating and other directions, can solve the problems affecting the stability of the slurry and coating effect, to improve the Electrochemical performance, good stability, the effect of reducing the generation and transfer of heat

Inactive Publication Date: 2019-07-09
SHANDONG XINGHUO SCI TECH INSTITYTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the existing functional coating materials are nano-scale, and the tiny particles are easy to agglomerate to form large particles after the slurry is dispersed, which affects the stability of the slurry and the coating effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A preparation method for a lithium-ion battery high conductivity graphene / carbon nanotube composite coating, comprising the steps of:

[0023] (1) Preparation of graphene oxide solution: graphene oxide was added to water for ultrasonic dispersion for 50 minutes to obtain graphite oxide floating liquid; the mass ratio of graphene oxide to water was 1:10;

[0024] (2) Preparation of nano-silicon solution: adding nano-silicon powder into N-methylpyrrolidone, and ultrasonically dispersing for 10 minutes to obtain nano-silicon solution; the mass ratio of nano-silicon powder to N-methylpyrrolidone is 1:6;

[0025] (3) the graphene oxide solution obtained in step 1 is mixed with the nano-silicon solution obtained in step 2, and ultrasonic 1h is obtained to obtain a uniform graphene oxide / nano-silicon mixed solution; the mass ratio of graphene oxide solution and nano-silicon solution is 20:5;

[0026] (4) Add carbon nanotubes to graphene oxide / nano-silicon mixed solution, ultr...

Embodiment 2

[0031] A preparation method for a lithium-ion battery high conductivity graphene / carbon nanotube composite coating, comprising the steps of:

[0032] (1) Preparation of graphene oxide solution: graphene oxide was added to water for ultrasonic dispersion for 60 minutes to obtain graphite oxide floating liquid; the mass ratio of graphene oxide to water was 5:20;

[0033] (2) Preparation of nano-silicon solution: adding nano-silicon powder into N-methylpyrrolidone and ultrasonically dispersing for 30 minutes to obtain nano-silicon solution; the mass ratio of nano-silicon powder to N-methylpyrrolidone is 3:10;

[0034] (3) the graphene oxide solution obtained in step 1 is mixed with the nano-silicon solution obtained in step 2, and ultrasonic 2h is obtained to obtain a uniform graphene oxide / nano-silicon mixed solution; the mass ratio of graphene oxide solution and nano-silicon solution is 30:8;

[0035] (4) Add carbon nanotubes to the graphene oxide / nano-silicon mixed solution, ...

Embodiment 3

[0040] A preparation method for a lithium-ion battery high conductivity graphene / carbon nanotube composite coating, comprising the steps of:

[0041] (1) Preparation of graphene oxide solution: graphene oxide was added to water for ultrasonic dispersion for 55 minutes to obtain graphite oxide floating liquid; the mass ratio of graphene oxide to water was 2:13;

[0042] (2) Preparation of nano-silicon solution: adding nano-silicon powder into N-methylpyrrolidone and ultrasonically dispersing for 18 minutes to obtain nano-silicon solution; the mass ratio of nano-silicon powder to N-methylpyrrolidone is 2:8;

[0043] (3) the graphene oxide solution obtained in step 1 is mixed with the nano-silicon solution obtained in step 2, and ultrasonic 2h is obtained to obtain a uniform graphene oxide / nano-silicon mixed solution; the mass ratio of graphene oxide solution and nano-silicon solution is 25:6;

[0044] (4) Add carbon nanotubes to graphene oxide / nano-silicon mixed solution, ultra...

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Abstract

The invention provides a preparation method of a high-conductivity graphene / carbon nanotube composite coating for lithium ion batteries, including the following steps: (1) preparing graphene oxide solution; (2) preparing nano-silicon solution; (3) preparing uniform graphene oxide / nano-silicon mixed solution; (4) preparing uniform and stable graphene oxide / nano-silicon / carbon nanotube mixed solution; (5) preparing graphene / nano-silicon / carbon nanotube mixed solution; (6) preparing coating slurry; and (7) coating a current collector with the coating slurry obtained in step (6), and drying the coating slurry to obtain a high-conductivity graphene / carbon nanotube composite coating for lithium ion batteries. The preparation method of a high-conductivity graphene / carbon nanotube composite coating for lithium ion batteries in the invention is safe, environment-friendly and stable, can significantly improve the electrochemical performance of lithium ion batteries and avoid the phenomenon of graphene agglomeration, and is conducive to the composition with carbon nanotubes.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a high-conductivity graphene / carbon nanotube composite coating for lithium-ion batteries and a preparation method thereof. Background technique [0002] At present, with the development of new energy technologies, the demand for lithium-ion power batteries is increasing. The demand for the use of a single battery has changed to the use of multiple series and parallel batteries, and it is difficult for traditional lithium-ion batteries to meet the requirements of high consistency and long service life of power batteries. It is a breakthrough technological innovation to use functional coating materials to surface treat the positive and negative electrodes of batteries and form functional coatings. [0003] However, the existing functional coating materials are nano-scale, and the tiny particles are easy to agglomerate to form large particles after the slurry is dispersed, whic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/139H01M10/42C09D127/16C09D133/04C09D101/28C09D109/06C09D7/61
CPCC08K2003/2206C08K2003/2227C08K2003/2244C08K2201/011C08L2203/20C09D101/284C09D109/06C09D127/16C09D133/04C09D7/61H01M4/0404H01M4/139H01M10/4235C08K3/00C08K3/042C08K3/041C08K3/36C08K3/22Y02E60/10
Inventor 车春玲
Owner SHANDONG XINGHUO SCI TECH INSTITYTE
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