Conductive agent and preparation method thereof, electrode and secondary battery

A conductive agent and electrode technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve problems such as lack of ion conductivity

A conductive agent and electrode technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve problems such as lack of ion conductivity

CN112886009BActive Publication Date: 2022-06-24EVERGRANDE NEW ENERGY TECH SHENZHEN CO LTD
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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. Disperse the sulfonated graphene metal salt and the carbon nanotubes in a solution, so that the sulfonated graphene metal salt and the carbon nanotubes are combined to form a wire-surface conductive network.

[0049] Wherein, the type selection of the sulfonated graphene metal salt and carbon nanotubes in step S01 and the proportion of their consumption are basically the same as the above sulfonated graphene metal salts and carbon nanotubes. In order to save space, no more One more elaboration.

[0050] Specifically, the sulfonated graphene metal salt and carbon nanotubes are dispersed in a solution, so that the sulfonated graphene metal salt and carbon nanotubes are combined to form a wire-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 sulfonate...

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, and the molar ratio of its sulfonate to 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 min to prepare a mixed powder.

[0089] 2) Prepare mixed solution

[0090] Under the vacuum condition of absolute pressure of 0.016MPa, according to the mass ratio of hydroxymethyl cellulose and N-methyl pyrrolidone to be 1:94, the hydroxymethyl cellulose and N-methyl pyrrolidone are heated below 70°C at a rotating speed of 1:94. 1200r / min was mixed for 60min to obta...

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, and the molar ratio of its sulfonate to lithium is 1:1;

[0099] Select multi-walled carbon nanotubes;

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

[0101] 2) Prepare mixed solution

[0102] Under the vacuum condition of absolute pressure of 0.016MPa, according to the mass ratio of hydroxymethyl cellulose and N-methyl pyrrolidone to be 1:94, the hydroxymethyl cellulose and N-methyl pyrrolidone are heated below 70°C at a rotating speed of 1:94. 1200r / min was mixed for 60min...

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Abstract

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

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 two are interdependent and restrict each other, which is more obvious under high current charging and discharging and low temperature environmental conditions. In order to ensure the high current charging and discharging rate, The cycle life and low-temperature performance of high-current charge-discharge must require the optimization of electronic conductivity while also improving lithium ion conductivity. [0003] In 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...

Claims

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Application Information

Patent Timeline
24 Jun 2022
Publication
CN112886009B
IPC
H01M4/62; H01M10/0525; B82Y30/00
CPC
H01M4/624; H01M4/625; H01M10/0525; B82Y30/00; Y02E60/10
Inventors
王永华; 赵文文