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A kind of preparation method of lithium ion battery conductive agent

A lithium-ion battery and conductive agent technology, which is 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: 2022-08-09
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 of a lithium ion battery negative electrode, comprising the following steps:

[0030] (1) The 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 at a temperature of 680°C in a muffle furnace 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 method;

[0034] (5) adding metal carbon nanotubes to deionized water, adding polyvinylpyrrolidone (surfactant) with a concentration of 2%, and then ultrasonically dispersing it uniformly to obtain a dispersion;

[0035] (6) Add activated carbon to the dispersion and ultrasonicate for 1 h at 300W power to obta...

Embodiment 2

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

[0041] (1) The 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 at a temperature of 740°C in a muffle furnace 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 method;

[0045] (5) adding metal carbon nanotubes to deionized water, adding polyvinylpyrrolidone (surfactant) with a concentration of 2%, and then ultrasonically dispersing it uniformly to obtain a dispersion;

[0046] (6) Add activated carbon to the dispersion and ultrasonicate for 1 h at 300W power to obt...

Embodiment 3

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

[0052] (1) The 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 at a temperature of 760°C in a muffle furnace 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 method;

[0056] (5) adding metal carbon nanotubes to deionized water, adding polyvinylpyrrolidone (surfactant) with a concentration of 2%, and then ultrasonically dispersing it uniformly to obtain a dispersion;

[0057] (6) Add activated carbon to the dispersion liquid and ultrasonicate for 1 h at a power o...

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Abstract

The invention discloses a preparation method of a lithium ion battery conductive agent, which mainly includes: (1) preparing a solid Ni-Mn-Al-O mixture; (2) using the solid Ni-Mn-Al-O mixture as a metal catalyst, and Carbon source and carrier gas together, metal carbon nanotubes were prepared by electrochemical vapor deposition method; (3) activated carbon / metal carbon nanotube films were prepared; (4) activated carbon / metal carbon nanotube films were used as working electrodes, and then graphite As the counter electrode, the salt solution is used as the electrolyte to directly apply a negative potential lower than ‑0.8V to the working electrode, and the holding time is longer than 2min, which reduces the size of the activated carbon / metal carbon nanotube film, and the reduced size of the activated carbon / metal carbon nanotube The film is used as a conductive agent for lithium ion batteries. The invention can quickly and effectively convert large-sized metal particles into small-sized particles, and avoid energy waste; at the same time, the conductive agent prepared by the invention can fully improve the cycle performance of lithium ion batteries after being applied to lithium ion batteries.

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] Lithium-ion batteries have received keen attention and strong pursuit in various industries due to their high energy density, flexible size, and unlimited application fields. For lithium-ion batteries, the negative electrode material is an important factor affecting its energy density. The intrinsic conductivity of the negative electrode material is not very high. Generally, the negative electrode material of commercial lithium-ion batteries is doped with conductive agents. Its unique mechanical, electrical and thermal properties are gradually replacing carbon black as an important component in the conductive agent of lithium ion batteries. [0003] In order to enhance the conductivity of the conductive agent and improve the cycle performance of lithium-ion batterie...

Claims

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Application Information

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Patent Type & Authority Patents(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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