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Carbon nanotube conductive paste and preparation method and application thereof

A technology of carbon nanotubes and conductive pastes, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of explosion, affecting the first charge and discharge efficiency of batteries, cycle performance, lithium-ion battery thermal Out of control and other problems, achieve high stability, small change in material shape, improve cycle performance and rate performance

Active Publication Date: 2021-06-25
哈尔滨万鑫石墨谷科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above studies are all aimed at improving the dispersibility of battery slurry, and the operating voltage range is only 2.75-4.2V. Under high voltage conditions exceeding 4.2V, the oxidation of the dispersant will cause side reactions in the battery system, affecting the performance of the battery. First-time charge and discharge efficiency, cycle performance, and even lead to thermal runaway and explosion of lithium-ion batteries in severe cases

Method used

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  • Carbon nanotube conductive paste and preparation method and application thereof
  • Carbon nanotube conductive paste and preparation method and application thereof
  • Carbon nanotube conductive paste and preparation method and application thereof

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0059] This embodiment provides a carbon nanotube conductive paste, the carbon nanotube conductive paste is 5% of carbon nanotubes, 1% of polyvinylidene fluoride, 93.8% of N-methylpyrrolidone and 0.2% of glutaric anhydride. %. The preparation method of described carbon nanotube conductive paste comprises the following steps:

[0060] (1) Add polyvinylidene fluoride, N-methylpyrrolidone and glutaric anhydride into the ball mill tank in proportion, and stir at 50 Hz for 30 min to obtain glue;

[0061] (2) Add carbon nanotubes in proportion to the glue solution in a ball mill tank, grind at 50 Hz for 60 min to obtain a primary grinding liquid, and grind the primary grinding liquid for 6 h with 1200r / min, 0.2Mpa in a sand mill, The carbon nanotube conductive paste is obtained.

Embodiment 2

[0063] This embodiment provides a carbon nanotube conductive paste, the carbon nanotube conductive paste is 1% carbon nanotube, 1% polyvinylpyrrolidone, 97.95% N-methylpyrrolidone and 0.05% glutaric anhydride by mass percentage . The preparation method of described carbon nanotube conductive paste comprises the following steps:

[0064] (1) Add polyvinylpyrrolidone, N-methylpyrrolidone and glutaric anhydride in proportion to the ball mill tank (closed to avoid contact with moisture), stir at 40 Hz for 40 minutes to obtain glue;

[0065] (2) Add carbon nanotubes in proportion to the glue solution in a ball mill tank, grind at 60 Hz for 50 min to obtain a primary grinding liquid, and grind the primary grinding liquid for 5 h with 1000r / min, 0.35Mpa in a sand mill, The carbon nanotube conductive paste is obtained.

Embodiment 3

[0067] This embodiment provides a carbon nanotube conductive paste, the carbon nanotube conductive paste is 10% of carbon nanotubes, 8% of polyvinylpyrrolidone, 81% of N-methylpyrrolidone and 2% of succinic anhydride by mass percentage . The preparation method of described carbon nanotube conductive paste comprises the following steps:

[0068] (1) Add polyvinylpyrrolidone, N-methylpyrrolidone and succinic anhydride into the ball mill tank in proportion, and stir at 60 Hz for 30 minutes to obtain glue;

[0069] (2) Add carbon nanotubes in proportion to the glue solution in a ball mill tank, grind at 40 Hz for 70 min to obtain a primary grinding liquid, and grind the primary grinding liquid for 7 h with 1500 r / min and 0.1 Mpa in a sand mill, The carbon nanotube conductive paste is obtained.

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Abstract

The invention relates to carbon nanotube conductive paste and a preparation method and application thereof. The carbon nanotube conductive paste comprises carbon nanotubes, a dispersant, a solvent and a stabilizer, wherein the stabilizer comprises an anhydride compound. In the carbon nanotube conductive paste, the stabilizer can be preferentially decomposed under a high-voltage condition (2.75-4.5 V). In addition, the conductive paste can be uniformly distributed in a homogenizing process, so that a stable CEI film is formed on the surface of a positive electrode material, the positive electrode material is prevented from being in direct contact with an electrolyte under a high-voltage charging and discharging condition, and the cycle performance and the rate capability of the battery are improved.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and relates to a carbon nanotube conductive paste and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high rated voltage, high power tolerance, long cycle life, high and low temperature adaptability, light weight, low self-discharge rate and environmental protection, and have been widely used in electronic products, new energy Automotive, aerospace and many other fields have broad development prospects. [0003] A lithium-ion battery generally includes a positive electrode sheet, a negative electrode sheet, and a separator spaced between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet includes a positive electrode collector and a positive electrode membrane coated on the positive electrode collector, and the negative electrode sheet includes a negati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/131H01M10/0525B82Y30/00
CPCH01M4/625H01M4/628H01M4/131H01M10/0525B82Y30/00H01M2004/028Y02E60/10
Inventor 张广明何斌冯晓彤娄明
Owner 哈尔滨万鑫石墨谷科技有限公司
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