Modified carbon nano tube and preparation method thereof, lithium ion battery anode and preparation method thereof and lithium ion battery

A lithium-ion battery, carbon nanotube technology, applied in battery electrodes, nanotechnology, nanotechnology and other directions, can solve problems such as poor ionic conductivity of lithium-ion batteries, improve high-rate charge and discharge performance, improve ionic conductivity, and be easy to disperse. on effect

Active Publication Date: 2015-12-30
BYD CO LTD
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  • Abstract
  • Description
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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 car

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  • Modified carbon nano tube and preparation method thereof, lithium ion battery anode and preparation method thereof and lithium ion battery
  • Modified carbon nano tube and preparation method thereof, lithium ion battery anode and preparation method thereof and lithium ion battery
  • Modified carbon nano tube and preparation method thereof, lithium ion battery anode and preparation method thereof and lithium ion battery

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[0037] The present invention also provides the above-mentioned preparation method of modified carbon nanotubes, and the method comprises the following steps:

[0038] S1, carbon nanotubes are contacted and reacted with nitric acid to obtain a first mixed solution;

[0039] S2, the first mixed solution is cooled, excess nitric acid is removed, and dried to obtain solid matter;

[0040]S3, the solid matter obtained in step S2 is dispersed in water, then LiX is added to obtain the second mixed solution, and then filtered and dried to obtain the modified carbon nanotubes;

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

[0042] According to the preparation method of modified carbon nanotubes provided by 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 some vacancy defects are oxidized and some vacancy defects are not oxidized, so that carbon nanotubes with be...

Example Embodiment

[0068] Example 1

[0069] 1. Preparation of modified carbon nanotubes

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

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

[0072] (3) After drying the obtained solid carbon nanotubes, mix with deionized water at a ratio of 1:5 and stir evenly, add a certain amount of solid LiOH, and adjust the pH of the mixed solution 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 modified carbon nanotubes A1.

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

[0075] (1) Add the dispersant to the solvent, stir for 10 minutes to completely dissolve;...

Example Embodiment

[0085] Example 2

[0086] 1. Preparation of modified carbon nanotubes

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

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

[0089] (3) After drying the obtained solid carbon nanotubes, mix 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 modified carbon nanotubes 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 it is completely...

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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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IPC IPC(8): H01M4/62C01B31/02H01M10/0525B82Y30/00
CPCY02E60/10
Inventor 杜木挺王晕
Owner BYD CO LTD
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