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Preparation method of lithium-ion battery, negative pole piece and element-doped carbon nanotube

A carbon nanotube and element doping technology, which is applied in battery electrodes, non-aqueous electrolyte battery electrodes, nanotechnology, etc., can solve the problems of poor hydrophilicity of carbon nanotubes, complicated preparation process, and reduced production capacity, so as to improve long cycle Performance, simple processing technology, and the effect of improving energy density

Active Publication Date: 2021-02-12
SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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Problems solved by technology

However, the hydrophilicity of carbon nanotubes is poor, so that their dispersion in the negative electrode is poor, and they are prone to agglomeration, which has a serious impact on the construction of a conductive network in the negative electrode and the processing of pulping and coating peaks.
[0003] The existing technology is to prepare carbon nanotubes into conductive paste under the action of dispersant, but the preparation process of this method is complicated and time-consuming, which reduces production capacity, and at the same time, due to the content of carbon nanotubes contained in the prepared conductive paste Low, it will cause low solid content in the process of preparing slurry, which will affect the preparation of pole pieces and the evaluation of battery performance in the later stage
In order to disperse the carbon nanotubes uniformly in the conductive paste, a dispersant, such as PVP, etc. is often used, but the dispersant is an "impurity" to the battery cell, and the impact on the performance of the battery cell is unknown, and needs to be evaluated

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  • Preparation method of lithium-ion battery, negative pole piece and element-doped carbon nanotube

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[0023] The invention provides a method for preparing element-doped carbon nanotubes. The elements include one or more of sulfur, boron and nitrogen.

[0024] refer to figure 1 , a method for preparing an element-doped carbon nanotube conductive agent according to an embodiment of the present invention, comprising:

[0025] S1: After mixing carbon nanotubes with one or more of boron source, sulfur source and nitrogen source in a specified ratio, perform ultrasonic treatment at a specified ultrasonic time to obtain a mixed liquid.

[0026] In this embodiment, the boron source includes boric acid; the sulfur source includes one or more of magnesium sulfate and thiourea, preferably magnesium sulfate; the nitrogen source includes one or more of nitric acid, ammonium chloride, ammonium sulfate and ammonium nitrate, Nitric acid is preferred; the specified ratio includes a mass ratio of 1: (0.5-10); the specified ultrasonic time includes 1-5h.

[0027] In this embodiment, boron, nit...

Embodiment 1

[0044]50g of carbon nanotubes and 1000g of nitric acid solution (nitric acid concentration 50%) were mixed, and after ultrasonication for 1h, a mixed liquid was obtained; the mixed liquid was dried at a temperature of 80°C for 24h to obtain a dry mixture; the dry mixture was heated in a tube furnace Under the protection of argon, the temperature was raised to 600 °C at a heating rate of 2 °C / min, and then naturally cooled to room temperature after heat preservation for 4 hours to obtain the crude product; the crude product was washed with deionized water for 5 times and dried at 80 °C for 24 hours to obtain nitrogen element Doped carbon nanotubes; directly add nitrogen-doped carbon nanotube powder into graphite for stirring, wherein graphite: nitrogen-doped carbon nanotubes: binder = 95.9:0.1:4, the solid content of the slurry after stirring 55% and a viscosity of 4000cP, coated with a transfer coater to obtain a negative electrode sheet; the negative electrode sheet is divided...

Embodiment 2

[0046] 50g of carbon nanotubes and 500g of boric acid solution (boric acid concentration 70%) were mixed, and after ultrasonication for 3h, a mixed liquid was obtained; the mixed liquid was dried at a temperature of 90°C for 18h to obtain a dry mixture; the dry mixture was heated in a tube furnace Under the protection of a mixed gas of nitrogen and ammonia, the temperature was raised to 800°C at a heating rate of 4°C / min, and after holding for 2 hours, the crude product was naturally cooled to room temperature to obtain the crude product; after the crude product was washed with deionized water for 6 times, it was heated at 90°C Dry for 18 hours to obtain boron-doped carbon nanotubes; directly add boron-doped carbon nanotube powder into the simple silicon material for stirring, wherein nano-silicon: boron-doped carbon nanotubes: binder = 95.92: 0.08 : 4. After stirring, the solid content of the slurry is 57%, and the viscosity is 3800cP. It is coated with a transfer coater, and ...

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Abstract

The invention discloses a method for preparing element-doped carbon nanotubes, which includes: mixing carbon nanotubes with one or more of boron source, sulfur source and nitrogen source in a specified ratio, and performing ultrasonic treatment at a specified ultrasonic time, Obtain a mixed liquid; dry the mixed liquid at a first specified temperature and a first specified time to obtain a dry mixture; heat the dry mixture to a second specified temperature at a specified heating rate under the protection of a protective gas, and keep warm for a second specified temperature. After a period of time, naturally cool to room temperature to obtain a crude product; wash the crude product with deionized water for a specified number of times, and dry at a third specified temperature for a third specified time to obtain element-doped carbon nanotubes. Realize the good conductivity and high energy density of the lithium-ion battery, and at the same time, significantly improve the dispersion of carbon nanotubes in the negative electrode.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a preparation method of lithium ion batteries, negative pole pieces and element-doped carbon nanotubes. Background technique [0002] Among the new conductive agents commonly used in power batteries, carbon nanotubes and graphene have become the focus of attention. Among them, graphene, as a two-dimensional material, can form a "point-surface contact mode" with active materials in the negative electrode. At the same time, graphene has a large specific surface area, excellent electrical conductivity and thermal performance, and is considered to be a very promising new conductive material. However, at high magnification, the sheet structure of graphene will hinder the transmission of ions, causing the polarization of the cell to increase, and the temperature rise and electrochemical performance of the cell will be seriously attenuated. In contrast, as a one-dimensional materia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/13H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/13H01M4/625H01M10/0525Y02E60/10
Inventor 陈媛媛张耀褚春波梁锐王威王明旺
Owner SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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