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Preparation method of lithium ion battery conductive agent

A lithium-ion battery and conductive agent technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of high surface energy of metal nanoparticles, great influence on catalytic activity, and difficult preparation, and achieve simple processing methods, Effect of shortening ion diffusion path and improving mechanical properties

Active Publication Date: 2021-01-05
INNER MONGOLIA HENGKE NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to enhance the conductivity of the conductive agent and improve the cycle performance of lithium-ion batteries, industry personnel usually load metal catalysts on carbon nanotubes. Among them, the size of metal nanoparticles has a great influence on the catalytic activity, and small-sized Due to the larger specific surface area and higher surface energy of nanoparticles, higher catalytic activity can be achieved. However, small-sized metal nanoparticles have high surface energy and are easy to aggregate, making the preparation extremely difficult.
The traditional method of converting large-sized metal particles into small-sized metal particles is mainly to introduce a suitable substrate under high temperature conditions, use thermal diffusion to destroy the metal-metal bond, and use the strong interaction between the substrate and the metal to assist in stabilizing small-sized metal particles, atomic clusters, and even Metal single atoms, but this method not only requires high temperature treatment, but also harsh conditions and serious energy waste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A preparation method for lithium ion battery negative electrode, comprising the steps of:

[0030] (1) Ni(NO 3 ) 2 , Mn(NO 3 ) 2 、Al 2 (NO 3 ) 3 Dissolve in deionized water at a molar ratio of 4:3:1 to obtain a mixed solution;

[0031] (2) Mix the mixture with 5mol / L NaOH solution to obtain supernatant and precipitate;

[0032] (3) Pour out the supernatant, and burn the precipitate in a muffle furnace at a temperature of 680°C to obtain a solid Ni-Mn-Al-O mixture;

[0033] (4) Using solid Ni-Mn-Al-O mixture as metal catalyst, together with carbon source and carrier gas, metal carbon nanotubes were prepared by electrochemical vapor deposition;

[0034] (5) Add metal carbon nanotubes to deionized water, and add polyvinylpyrrolidone (surfactant) with a concentration of 2%, and then ultrasonically disperse them evenly to obtain a dispersion;

[0035] (6) Add activated carbon to the dispersion and sonicate for 1 hour at a power of 300W to obtain a suspension; the ma...

Embodiment 2

[0040] A preparation method for lithium ion battery negative electrode, comprising the steps of:

[0041] (1) Ni(NO 3 ) 2 , Mn(NO 3 ) 2 、Al 2 (NO 3 ) 3Dissolve in deionized water at a molar ratio of 5:2:0.8 to obtain a mixed solution;

[0042] (2) Mix the mixture with 6mol / L NaOH solution to obtain supernatant and precipitate;

[0043] (3) Pour out the supernatant, and burn the precipitate in a muffle furnace at a temperature of 740°C to obtain a solid Ni-Mn-Al-O mixture;

[0044] (4) Using solid Ni-Mn-Al-O mixture as metal catalyst, together with carbon source and carrier gas, metal carbon nanotubes were prepared by electrochemical vapor deposition;

[0045] (5) Add metal carbon nanotubes to deionized water, and add polyvinylpyrrolidone (surfactant) with a concentration of 2%, and then ultrasonically disperse them evenly to obtain a dispersion;

[0046] (6) Add activated carbon to the dispersion and sonicate for 1 hour at a power of 300W to obtain a suspension; the m...

Embodiment 3

[0051] A preparation method for lithium ion battery negative electrode, comprising the steps of:

[0052] (1) Ni(NO 3 ) 2 , Mn(NO 3 ) 2 、Al 2 (NO 3 ) 3 Dissolve in deionized water at a molar ratio of 5:1:0.6 to obtain a mixed solution;

[0053] (2) Mix the mixture with 6mol / L NaOH solution to obtain supernatant and precipitate;

[0054] (3) Pour out the supernatant, and burn the precipitate in a muffle furnace at a temperature of 760°C to obtain a solid Ni-Mn-Al-O mixture;

[0055] (4) Using solid Ni-Mn-Al-O mixture as metal catalyst, together with carbon source and carrier gas, metal carbon nanotubes were prepared by electrochemical vapor deposition;

[0056] (5) Add metal carbon nanotubes to deionized water, and add polyvinylpyrrolidone (surfactant) with a concentration of 2%, and then ultrasonically disperse them evenly to obtain a dispersion;

[0057] (6) Add activated carbon to the dispersion and sonicate for 1 hour at a power of 300W to obtain a suspension; the ...

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Abstract

The invention discloses a preparation method of a lithium ion battery conductive agent. The preparation method mainly comprises the following steps: (1) preparing a solid Ni-Mn-Al-O mixture; (2) taking the solid Ni-Mn-Al-O mixture as a metal catalyst, and preparing a metal carbon nanotube together with a carbon source and carrier gas through adoption of an electrochemical vapor deposition method;(3) preparing an activated carbon / metal carbon nanotube film; and (4) directly applying a negative potential of less than 0.8 V to the working electrode by taking the activated carbon / metal carbon nanotube film as the working electrode, graphite as a counter electrode and a saline solution as an electrolyte, and maintaining for more than 2 minutes, so that the size of the activated carbon / metal carbon nanotube film is reduced, and the electrochemical performance is improved. The active carbon / metal carbon nanotube film with the reduced size is used as the lithium ion battery conductive agent.According to the invention, large-size metal particles can be rapidly and effectively converted into small-size particles, and energy waste is avoided; and meanwhile, after the prepared conductive agent is applied to the lithium ion battery, the cycle performance of the lithium ion battery can be fully improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of a conductive agent for lithium ion batteries. Background technique [0002] Due to its high energy density, flexible size, unlimited application fields and many other advantages, lithium-ion batteries have received keen attention and vigorous pursuit from various industries. For lithium-ion batteries, the negative electrode material is an important factor affecting its energy density. The intrinsic conductivity of negative electrode materials is not very high. Generally, commercial lithium-ion battery negative electrode materials will be doped with conductive agents, and carbon nanotubes are due to Its unique mechanical, electrical and thermal properties are gradually replacing carbon black as an important component of lithium-ion battery conductive agents. [0003] In order to enhance the conductivity of the conductive agent and improve the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/625H01M10/0525Y02E60/10
Inventor 王腾师向林
Owner INNER MONGOLIA HENGKE NEW MATERIAL TECH CO LTD
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