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A high-performance lithium-ion battery c 3 n 4 Preparation method of carbon composite anode material

A lithium-ion battery, C3N4 technology, applied in the direction of battery electrodes, active material electrodes, negative electrodes, etc., can solve the problems of low yield, poor conductivity, and few active sites, and achieve cheap raw materials, improve conductivity, and prepare The effect of simple method

Active Publication Date: 2022-06-24
晶瑞新能源科技有限公司
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, pure C 3 N 4 The structure of the material is relatively complete, with fewer active sites, and the current synthesis of C 3 N 4 The method is mainly formed by high-temperature carbonization polymerization of precursors containing carbon and nitrogen elements such as melamine or urea. The C prepared by this method 3 N 4 There are problems such as low yield (yield less than 10%) and poor conductivity, which largely limit the C 3 N 4 Fields of application in electrochemistry

Method used

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  • A high-performance lithium-ion battery c <sub>3</sub> n <sub>4</sub> Preparation method of carbon composite anode material
  • A high-performance lithium-ion battery c <sub>3</sub> n <sub>4</sub> Preparation method of carbon composite anode material
  • A high-performance lithium-ion battery c <sub>3</sub> n <sub>4</sub> Preparation method of carbon composite anode material

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Experimental program
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Effect test

Embodiment 1

[0030] Example 1 A high-performance lithium-ion battery C 3 N 4 Preparation method of carbon composite anode material

[0031] This embodiment is a high-performance lithium-ion battery C 3 N 4 The preparation method of / carbon composite negative electrode material is carried out in sequence according to the following steps:

[0032] (11) Weigh 1kg of melamine-containing drug and 1L of NMP (N-methylpyrrolidone) of analytical purity and place them in the reactor, so that the total filling volume of the two raw materials is 30% of the reactor volume (the volume of the inner cavity of the reactor). %, after the air in the reactor is replaced with argon, the reactor is sealed;

[0033] (12) The reactor was heated to 500°C at a heating rate of 1° / min, and the holding time was 4h. Then the reactor is naturally cooled to room temperature, and the mixture is taken out;

[0034] (13) The above mixture was centrifuged and washed 3 times with absolute ethanol and distilled water, re...

Embodiment 2

[0037] Example 2 A high-performance lithium-ion battery C 3 N 4 Preparation method of carbon composite anode material

[0038] (21) Weigh 2.2kg of urea-containing drug and 2L of acetonitrile with analytical purity and place them in the reactor, so that the total filling volume of the two raw materials is 60% of the reactor volume (the volume of the inner cavity of the reactor), and the air in the reactor is 60%. After replacing with argon, seal the reactor;

[0039] (22) The reactor was heated to 400°C at a heating rate of 5° / min, and the holding time was 3h. Then the reactor is naturally cooled to room temperature, and the mixture is taken out;

[0040] (23) The above mixture was centrifuged and washed 5 times with absolute ethanol and distilled water, respectively, and the obtained powder was vacuum-dried at 110 °C for 8 h in a vacuum drying oven to obtain C with high specific capacity. 3 N 4 / C composite anode material.

[0041] C prepared in this example 3 N 4 The ...

Embodiment 3

[0043] Example 3 A high-performance lithium-ion battery C 3 N 4 Preparation method of carbon composite anode material

[0044] (31) Weigh 1.6kg and 1.5L NMP of thiourea-containing drugs of analytical purity and place them in the reactor, so that the total filling volume of the two raw materials is 50% of the reactor volume (the volume of the inner cavity of the reactor). After the inner air was replaced with argon, the reactor was sealed;

[0045] (32) The reactor was heated to 600°C at a heating rate of 3° / min, and the holding time was 1h. Then the reactor is naturally cooled to room temperature, and the mixture is taken out;

[0046] (33) The above mixture was centrifuged and washed 4 times with absolute ethanol and distilled water, and the obtained powder was vacuum-dried at 100 °C for 10 h in a vacuum drying oven to obtain C with high specific capacity. 3 N 4 / C composite anode material.

[0047] C prepared in this example 3 N 4 The / C material is mainly intertwine...

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Abstract

The invention discloses a high performance lithium ion battery C 3 N 4 / The preparation method of carbon composite negative electrode material, the precursor containing two elements of C and N and the liquid carbon source are placed in the reactor, sealed under the argon atmosphere, and then kept at 400-600 ° C for 1-4 hours, and the mixture is cooled. After washing and drying to obtain the product, the present invention is carried out in a closed reaction environment, and the prepared C 3 N 4 The material has a high yield, and at the same time, due to the addition of a liquid carbon source, the C 3 N 4 In situ carbonization during synthesis into C 3 N 4 The / C structure improves the conductivity of the material and thus has excellent electrochemical performance. The present invention is suitable for preparing lithium ion battery C 3 N 4 / carbon composite anode material.

Description

technical field [0001] The invention belongs to the technical field of preparation of negative electrode materials for lithium ion batteries, and relates to a high-performance lithium ion battery C 3 N 4 Preparation method of carbon composite anode material. Background technique [0002] Lithium-ion batteries have the advantages of long cycle life, high energy density, and fast charging and discharging. They are widely used in emerging fields such as electric vehicles, hybrid electric vehicles, smart grids and other mobile electronic devices, but their energy density still needs to be further improved. The current commercial lithium-ion battery anode material is mainly graphite material, and its theoretical capacity is only 372 mAh / g, which seriously restricts the improvement of the overall energy density of the battery. Therefore, the development of new alternative anode materials with high discharge capacity, safety and economy is one of the hotspots in the field of batt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/587H01M4/62H01M10/0525
CPCH01M4/362H01M4/583H01M4/587H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 李虎林杨霄王建辉蔡建荣
Owner 晶瑞新能源科技有限公司