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Secondary battery and electronic device

A technology for secondary batteries and carbon nanotube bundles, applied in secondary batteries, secondary battery manufacturing, battery electrodes, etc., can solve the problem of battery rate performance, deterioration of charging performance, increase in DC internal resistance of batteries, and damage to conductive networks, etc. problem, to achieve the effect of improved battery life, improved cycle life, strong conductive network

Active Publication Date: 2022-04-08
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 battery and electronic device

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0083] In the positive electrode preparation method, including:

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

[0085] 1) Mix the positive electrode active material, carbon material, binder, and 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) After drying the solvent, obtain a primary pole piece coated with a positive electrode active material layer;

[0088] 4) The primary pole piece obtained in step 3) is dried and rolled to obtain a positive pole piece.

[0089] Specifically, the carbon material may be a conductive agent made by mixing carbon nanotube bundles and 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 bundle can be purchased from the market, as long as it meets the parameters of the carbon nanotube bundle of the present application.

[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 they meet the parameters of the second carbon nanotubes of the present application.

[0097] Table b Parameters of the second carbon nanotubes

[0098] .

Embodiment 1-1

[0100] S100, the LiCoO 2 ,1 # Carbon nanotube bundles and PVDF are mixed according to the 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 invention discloses a secondary battery and an electronic device, and belongs to the technical field of batteries. The secondary battery comprises a positive pole piece, wherein the positive pole piece comprises a current collector and a positive active material layer; the positive electrode active material layer comprises a positive electrode active material and a carbon material; the carbon material comprises a carbon nanotube bundle with the length-diameter ratio of 2.5 to 100; the carbon nano tube bundle comprises a plurality of first carbon nano single tubes. The carbon nanotube bundle can reduce the initial internal resistance of the battery, guarantee the improvement of a conductive network in the circulation process, effectively reduce the increase of the internal resistance, and improve the charging speed.

Description

technical field [0001] The present application relates to the field of battery technology, 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 cycle charge and discharge process, part of the conductive network is destroyed, resulting in the increase of the DC internal resistance DCR of the battery. The increase in battery DCR will lead to deterioration of battery rate performance and charging performance, and rapid life decay. Therefore, it is necessary to work towards significantly improving DCR growth. Contents of the invention [0003] The present application provides a secondary battery including a positive pole piece, the positive pole piece contains a carbon nanotube bundle, and the carbon nanotube bundle contains a plurality of first single carbon nanotubes. Carbon nanotube bundles can not only reduc...

Claims

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Application Information

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Patent Type & Authority Applications(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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