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Secondary batteries and electronic devices

A secondary battery and carbon nanotube bundle technology, applied in secondary batteries, secondary battery manufacturing, battery electrodes, etc., can solve battery rate performance, charging performance deterioration, battery DC internal resistance DCR growth, conductive network damage, etc. Problems, achieve the effect of improving battery life, cycle life improvement, and strong conductive network

Active Publication Date: 2022-08-09
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] During the use of the secondary battery, due to the continuous expansion and contraction of the positive pole piece during the cycle charge and discharge process, part of the conductive network is destroyed, resulting in an increase in the DC internal resistance DCR of the battery.
The increase of battery DCR will lead to deterioration of battery rate performance and charging performance, and rapid life decay. Therefore, it is necessary to work in the direction of significantly improving DCR growth.

Method used

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  • Secondary batteries and electronic devices
  • Secondary batteries and electronic devices
  • Secondary batteries and electronic devices

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0083] In the preparation method of the positive electrode, it includes:

[0084] Specifically, the preparation of the positive electrode sheet includes:

[0085] 1) Mix the positive active material, carbon material, binder, solvent (such as deionized water, N-methylpyrrolidone) evenly to make a slurry;

[0086] 2) coating the slurry in step 1) on the target area of ​​the current collector;

[0087] 3) obtaining the primary pole piece coated with the positive electrode active material layer by drying the solvent;

[0088] 4) drying and rolling the primary pole piece obtained in step 3) to obtain a positive pole piece.

[0089] Specifically, the carbon material may be a carbon nanotube bundle, and a conductive agent prepared by mixing at least one of conductive carbon black and second carbon nanotubes.

[0090] Optionally, the positive electrode active material layer includes a positive electrode active material, carbon nanotube bundles, second carbon nanotubes, and a binder...

Embodiment approach

[0093] The parameters of the carbon nanotube bundles in each example are shown in Table a. The carbon nanotube bundles can be purchased from the market, as long as the parameters of the carbon nanotube bundles of the present application are satisfied.

[0094] Table a Parameters of carbon nanotube bundles

[0095]

[0096] The parameters of the second carbon nanotubes in each example are shown in Table b. The carbon nanotubes can be purchased from the market, as long as the parameters of the second carbon nanotubes of the present application are satisfied.

[0097] Table b Parameters of the second carbon nanotubes

[0098] .

Embodiment 1-1

[0100] S100, the LiCoO 2 ,1 # The carbon nanotube bundles and PVDF are mixed in a ratio of 98.2:0.5:1.3 to prepare a slurry;

[0101] S200, coating the slurry on the target area of ​​the current collector (aluminum foil);

[0102] S300, drying at 120° C. to obtain a primary pole piece coated with an active material layer;

[0103] S400, drying and rolling the primary pole piece obtained in step S300 to obtain the positive pole piece.

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Abstract

The present application discloses a secondary battery and an electronic device, belonging to the technical field of batteries. The secondary battery includes a positive electrode sheet including a current collector and a positive electrode active material layer; the positive electrode active material layer includes a positive electrode active material and a carbon material; the carbon material includes carbon with an aspect ratio of 2.5 to 100 A nanotube bundle; the carbon nanotube bundle includes a plurality of first carbon nanotubes. The carbon nanotube bundles in the present application can reduce the initial internal resistance of the battery, ensure a perfect conductive network during the cycle, effectively reduce the increase in internal resistance, and improve the charging speed.

Description

technical field [0001] The present application relates to the field of battery technology, and in particular, to a secondary battery and an electronic device. Background technique [0002] During the use of the secondary battery, due to the continuous expansion and contraction of the positive pole piece during the cyclic charge and discharge process, part of the conductive network is destroyed, resulting in an increase in the DC internal resistance of the battery. The increase of battery DCR will lead to the deterioration of battery rate performance and charging performance, and the rapid decay of life. Therefore, efforts should be made to significantly improve the growth of DCR. SUMMARY OF THE INVENTION [0003] The application provides a secondary battery including a positive electrode plate, the positive electrode plate includes a carbon nanotube bundle, and the carbon nanotube bundle includes a plurality of first carbon nanotubes. Carbon nanotube bundles can not only ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/02H01M4/04H01M4/13H01M4/139H01M10/04H01M10/0525B82Y30/00B82Y40/00
CPCY02P70/50Y02E60/10B82Y30/00B82Y40/00H01M4/04H01M4/02H01M4/13H01M4/139H01M4/62H01M10/04H01M10/0525
Inventor 陈梅锋
Owner NINGDE AMPEREX TECH
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