Conductive agent and preparation method thereof, electrode and secondary battery

A technology of conductive agent and conductive network, used in secondary batteries, battery electrodes, circuits, etc., can solve problems such as lack of ionic conductivity

Active Publication Date: 2021-06-01
EVERGRANDE NEW ENERGY TECH SHENZHEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem that the existing carbon-based materials do not have ion conductivity, and provide a conductive agent and its preparation method. The conductive agent has good electronic conductivity and ion conductivity, which can improve the battery Rate performance and cycle performance

Method used

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  • Conductive agent and preparation method thereof, electrode and secondary battery
  • Conductive agent and preparation method thereof, electrode and secondary battery
  • Conductive agent and preparation method thereof, electrode and secondary battery

Examples

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preparation example Construction

[0047] Correspondingly, a preparation method of a conductive agent, comprising:

[0048] S01, dispersing the sulfonated graphene metal salt and carbon nanotubes in the solution, so that the sulfonated graphene metal salt and carbon nanotubes are combined to form a line-surface conductive network.

[0049] Wherein, the type selection and dosage ratio of the sulfonated graphene metal salt and carbon nanotubes in step S01 are basically the same as the above sulfonated graphene metal salts and carbon nanotubes. In order to save space, they are not repeated here. A repeat.

[0050] Specifically, the sulfonated graphene metal salt and carbon nanotubes are dispersed in the solution, so that the sulfonated graphene metal salt and carbon nanotubes combine to form a line-surface conductive network.

[0051] As an embodiment, the step of dispersing the sulfonated graphene metal salt and carbon nanotubes in the solution includes:

[0052] S011, mixing the sulfonated graphene metal salt ...

Embodiment 1

[0084] This embodiment provides a method for preparing a lithium-ion battery, which specifically includes the following steps:

[0085] 1) Preparation of mixed powder of sulfonated graphene lithium salt and carbon nanotubes

[0086] Choose sulfonated graphene lithium salt, the mol ratio of its sulfonate group and lithium is 1:1;

[0087] Select multi-walled carbon nanotubes;

[0088] According to the mass ratio of the sulfonated graphene lithium salt and the multi-walled carbon nanotubes being 1:5, the sulfonated graphene metal salt and the multi-walled carbon nanotubes were mechanically mixed and stirred for 90 minutes to obtain a mixed powder.

[0089] 2) Prepare mixed solution

[0090] Under vacuum conditions with an absolute pressure of 0.016MPa, according to the ratio of the mass ratio of hydroxymethyl cellulose to N-methylpyrrolidone of 1:94, the hydroxymethyl cellulose and N-methylpyrrolidone are rotated at a speed below 70°C Mix at 1200r / min for 60min to obtain a so...

Embodiment 2

[0096] This embodiment provides a method for preparing a lithium-ion battery, which specifically includes the following steps:

[0097] 1) Preparation of mixed powder of sulfonated graphene lithium salt and carbon nanotubes

[0098] Choose sulfonated graphene lithium salt, the mol ratio of its sulfonate group and lithium is 1:1;

[0099] Select multi-walled carbon nanotubes;

[0100] According to the mass ratio of the sulfonated graphene lithium salt and the multi-walled carbon nanotubes being 1:6, the sulfonated graphene metal salt and the multi-walled carbon nanotubes were mechanically mixed and stirred for 90 minutes to obtain a mixed powder.

[0101] 2) Prepare mixed solution

[0102] Under vacuum conditions with an absolute pressure of 0.016MPa, according to the ratio of the mass ratio of hydroxymethylcellulose to N-methylpyrrolidone of 1:94, the hydroxymethylcellulose and N-methylpyrrolidone are rotated at a speed below 70°C Mix at 1200r / min for 60min to obtain a solu...

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Abstract

The invention relates to the technical field of lithium ion batteries, and discloses a conductive agent and a preparation method thereof, an electrode material and a secondary battery. The conductive agent provided by the invention comprises sulfonated graphene metal salt and carbon nanotubes, and the sulfonated graphene metal salt and the carbon nanotubes are combined to form a line-plane conductive network. The conductive agent has dual effects of electron conduction and ion conduction, and when the conductive agent is applied to preparation of a battery, electron conduction and ion conduction in the battery can be optimized, and the rate capability, the cycle performance and the low-temperature performance of the secondary battery can be improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a conductive agent and a preparation method thereof, and also to an electrode and a secondary battery. Background technique [0002] The charging and discharging process of lithium-ion batteries is the process of lithium ion deintercalation and electron transfer. The cycle life of high-current charge and discharge and low-temperature performance must require the optimization of electronic conductivity and the improvement of lithium ion conductivity. [0003] In the existing industrial production, lithium-ion batteries generally use carbon-based materials such as acetylene black, conductive graphite, carbon black, and carbon nanotubes as oil-based or water-based conductive agents. These carbon-based materials can effectively improve the performance of lithium-ion batteries. electronic conductivity. However, since these carbon-based materials have no ion conductivit...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0525B82Y30/00
CPCH01M4/624H01M4/625H01M10/0525B82Y30/00Y02E60/10
Inventor 王永华赵文文高俊强黄继春刘海昌蒲树环
Owner EVERGRANDE NEW ENERGY TECH SHENZHEN CO LTD
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