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A modified carbon nanotube and its preparation method, lithium-ion battery positive electrode and its preparation method, and lithium-ion battery

A technology of lithium-ion batteries and carbon nanotubes, which is applied in the field of lithium-ion batteries, can solve the problems of poor ion conductivity of lithium-ion batteries, and achieve the effects of improving high-rate charge and discharge performance, increasing ion conductivity, and sufficient dispersion

Active Publication Date: 2019-04-19
BYD CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] In order to solve the technical problem of poor ion conductivity of the lithium ion battery when the existing carbon nanotubes are applied to the positive electrode of the lithium ion battery, the present invention provides a modified carbon nanotube with good ion conductivity when applied to the positive electrode of the lithium ion battery. Nanotube and preparation method thereof, positive electrode of lithium ion battery and preparation method thereof, and lithium ion battery

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  • A modified carbon nanotube and its preparation method, lithium-ion battery positive electrode and its preparation method, and lithium-ion battery
  • A modified carbon nanotube and its preparation method, lithium-ion battery positive electrode and its preparation method, and lithium-ion battery
  • A modified carbon nanotube and its preparation method, lithium-ion battery positive electrode and its preparation method, and lithium-ion battery

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preparation example Construction

[0037] The present invention also provides a method for preparing the above-mentioned modified carbon nanotube, the method comprising the following steps:

[0038] S1. Contacting and reacting carbon nanotubes with nitric acid to obtain a first mixed solution;

[0039] S2, cooling the first mixed liquid, removing excess nitric acid, and drying to obtain a solid substance;

[0040]S3. Disperse the solid matter obtained in step S2 in water, then add LiX to obtain a second mixed solution, then filter and dry to obtain the modified carbon nanotube;

[0041] where X is CO 3 2- , O 2- , OH - .

[0042] According to the method for preparing modified carbon nanotubes provided in the present invention, preferably, the mass concentration of the nitric acid is 15%-40%. Nitric acid within this concentration range can prepare carbon nanotubes in which part of the vacancy defects are oxidized and part of the vacancy defects are not oxidized, and only then can the carbon nanotubes with ...

Embodiment 1

[0069] 1. Preparation of modified carbon nanotubes

[0070] (1) After mixing carbon nanotubes and dilute nitric acid (mass concentration: 15%) at a ratio of 1:5, reflux at 100°C for 120 minutes to obtain a mixed solution;

[0071] (2) After cooling the above mixture, filter it, and wash it with deionized water several times until the pH of the supernatant is 6.0;

[0072] (3) After drying the obtained carbon nanotube solids, mix them with deionized water at a ratio of 1:5 and stir evenly, add a certain amount of LiOH solids, and adjust the pH of the mixture to 7.5;

[0073] (4) The above mixed solution was refluxed and boiled at 100° C. for 20 minutes, the mixed solution was cooled, filtered, washed with deionized water for 3 times, and the solid was dried to obtain the modified carbon nanotube A1.

[0074] 2. Preparation of positive electrode for lithium-ion battery

[0075] (1) Add the dispersant to the solvent and stir for 10 minutes to completely dissolve; then add carbo...

Embodiment 2

[0086] 1. Preparation of modified carbon nanotubes

[0087] (1) After mixing carbon nanotubes and dilute nitric acid (mass concentration: 30) in a ratio of 1:10, reflux at 150°C for 30 minutes to obtain a mixed solution;

[0088] (2) After cooling the above mixture, filter it, and wash it with deionized water several times until the pH of the supernatant is 6.5;

[0089] (3) After drying the obtained carbon nanotube solids, mix them with deionized water at a ratio of 1:3 and stir evenly, and add a certain amount of Li 2 CO 3 solid, adjust the pH of the mixture to 8.0;

[0090] (4) The above mixed solution was refluxed and boiled at 150° C. for 10 minutes, the mixed solution was cooled, filtered, washed with deionized water for 3 times, and the solid was dried to obtain the modified carbon nanotube A2.

[0091] 2. Preparation of positive electrode for lithium-ion battery

[0092] (1) Add the dispersant to the solvent and stir for 30 minutes until completely dissolved; then ...

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Abstract

The invention provides a modified carbon nano tube and a preparation method thereof, a lithium ion battery anode and a preparation method thereof and a lithium ion battery. The modified carbon nano tube comprises a carbon nano tube and a polar group on the surface of the carbon nano tube, wherein the polar group is -COOLi. The modified carbon nano tube provided by the invention has the characteristics of being easy to disperse, low in dispersing cost and good in electrical conductivity; compared with a lithium ion battery adopting the dispersion liquid of an unmodified carbon nano tube as a conductive agent, the lithium ion battery adopting the dispersion liquid of the carbon nano tube as a conductive agent has a lower direct current impedance and alternating-current impedance, and is greatly improved in the high-rate charge-discharge capability.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a modified carbon nanotube and a preparation method thereof, a positive electrode of a lithium ion battery, a preparation method thereof, and a lithium ion battery. Background technique [0002] Carbon nanotubes use organic alkanes, alkenes or alkyne small molecules, and under certain temperature conditions, adopt the method of vapor phase deposition, so that organic small molecules can be catalytically grown on the surface of specific metal or metal oxide nanoparticles. owned. carbon nanotubes by sp 2 The C-C bond formed by hybridization has extremely excellent electrical conductivity, thermal conductivity and mechanical strength. Based on the above characteristics, the use of carbon nanotubes as a conductive agent for lithium-ion batteries will make the battery pole piece have excellent conductivity. Firmly binding the active materials not only enhances the b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62C01B32/168H01M10/0525B82Y30/00
CPCY02E60/10
Inventor 杜木挺王晕
Owner BYD CO LTD
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