Carbon-nitrogen-lithium multi-phase doped lithium ion battery negative electrode material, preparation method of material, lithium ion battery negative electrode plate and lithium ion battery

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as safety issues and complex preparation methods, achieve low equipment requirements, controllable reaction conditions, and increase the first Coulombic efficiency and cycle life effects

Inactive Publication Date: 2019-06-14
ZOTYE INT AUTOMOBILE TRADING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The traditional preparation method of hard carbon materials is relatively complicated, and it is necessary to improve the morphology of hard carbon, such as pore-forming, modification and other modification treatments.
At the same time, since hard carbon is formed by carbonization of polymers, most polymers have safety issues

Method used

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  • Carbon-nitrogen-lithium multi-phase doped lithium ion battery negative electrode material, preparation method of material, lithium ion battery negative electrode plate and lithium ion battery
  • Carbon-nitrogen-lithium multi-phase doped lithium ion battery negative electrode material, preparation method of material, lithium ion battery negative electrode plate and lithium ion battery
  • Carbon-nitrogen-lithium multi-phase doped lithium ion battery negative electrode material, preparation method of material, lithium ion battery negative electrode plate and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A method for preparing a carbon-nitrogen lithium heterogeneously doped lithium-ion battery negative electrode material, comprising the following steps:

[0043] 1) Weigh 13.96 g of choline chloride and 21.20 g of lithium chloride at a molar ratio of 1:5, and stir in a constant temperature magnetic stirrer at 70°C for 2 hours to obtain a deep eutectic solvent;

[0044] 2) 17.28 g of lignocellulose and 34.56 g of deep eutectic solvent were weighed according to a mass ratio of 1:2, and stirred at 100° C. for 2 h in a constant temperature magnetic stirrer to obtain a mixture;

[0045] 3) The mixture obtained in 2) was first heated to 300°C at a heating rate of 5°C / min under an air atmosphere, and kept for 2 hours; get carbides.

[0046] 4) The obtained carbide was washed with absolute ethanol for 3 times and then filtered; then ball milled in a ball mill at 600r / min for 4h, and screened with a 200-mesh screen to obtain a carbon-nitrogen-lithium heterogeneous doped lithium-...

Embodiment 2

[0048] A method for preparing a carbon-nitrogen lithium heterogeneously doped lithium-ion battery negative electrode material, comprising the following steps:

[0049] 1) Weigh 27.92 g of choline chloride and 21.20 g of lithium chloride in a molar ratio of 2:5, and stir in a constant temperature magnetic stirrer at 70°C for 2 hours to obtain a deep eutectic solvent;

[0050] 2) 17.28 g of lignocellulose and 34.56 g of deep eutectic solvent were weighed according to a mass ratio of 1:2, and stirred at 100° C. for 2 h in a constant temperature magnetic stirrer to obtain a mixture;

[0051] 3) The mixture obtained in 2) was first heated to 300°C at a heating rate of 5°C / min under an air atmosphere, and kept for 2 hours; get carbides.

[0052]The obtained carbide was washed with absolute ethanol for 3 times and then filtered; then ball milled in a ball mill at 600r / min for 4h, and screened with a 200-mesh screen to obtain a carbon-nitrogen-lithium heterogeneous doped lithium-ion ...

Embodiment 3

[0054] A method for preparing a carbon-nitrogen lithium heterogeneously doped lithium-ion battery negative electrode material, comprising the following steps:

[0055] 1) Weigh 13.96 g of choline chloride and 21.20 g of lithium chloride at a molar ratio of 1:5, and stir in a constant temperature magnetic stirrer at 90°C for 2 hours to obtain a deep eutectic solvent;

[0056] 2) 11.72 g of lignocellulose and 35.16 g of deep eutectic solvent were weighed according to a mass ratio of 1:3, and stirred in a constant temperature magnetic stirrer at 80°C for 2 hours to obtain a mixture;

[0057] 3) The mixture obtained in 2) was first heated to 300°C at a heating rate of 5°C / min in an air atmosphere, and kept for 2 hours; then under Ar flow, the temperature was raised to 800°C at a heating rate of 5°C / min, and kept for 4 hours. get carbides.

[0058] 4) The obtained carbide was washed with absolute ethanol for 3 times and then filtered; then ball milled at 600r / min for 4h in a ball ...

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Abstract

The invention discloses a carbon-nitrogen-lithium multi-phase doped lithium ion battery negative electrode material, a preparation method of the material, a lithium ion battery negative electrode plate and a lithium ion battery. A halogenated choline type low eutectic solvent is uniformly mixed according to a ratio to obtain a low eutectic solvent, and then the low eutectic solvent is mixed with lignocellulose; pretreatment is carried out firstly and then high-temperature carbonization is carried out to obtain a carbon material doped with nitrogen and lithium; and the carbon material can be applied to the lithium ion battery negative electrode material. A precursor adopted in the preparation method is obtained by uniformly mixing halogenated lithium with halogenated choline and derivativesthereof; the precursor is environment-friendly, wide in source and low in cost, and can be obtained on a large scale from the industry; a preparation process adopted by the method is concise, high inyield and high in purity; and a reaction system involved in the method disclosed by the invention is simple in component, convenient to configure, simple to operate, low in equipment requirement andfree of regional limitation, and is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of materials and chemical power sources, and in particular relates to a carbon-nitrogen-lithium multiphase doped lithium-ion battery negative electrode material and a preparation method thereof, a lithium-ion battery negative plate and a lithium-ion battery. Background technique [0002] With the rapid development of ever-changing chemical batteries, there are higher and higher requirements for battery materials. With the rapid progress of lithium-ion battery cathode materials, there are also higher requirements for battery anode materials. The most important commercial anode materials currently on the market are carbon materials, such as graphite, hard carbon, and mesocarbon microspheres. However, the theoretical specific capacity of the carbon material is only 372mAh / g. At the same time, the carbon material and the carbonate electrolyte form a solid electrolyte interfacial film (SEI) during the first char...

Claims

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Application Information

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IPC IPC(8): H01M4/133H01M4/583H01M10/0525
CPCY02E60/10
Inventor 王康彦金源郭永斌牛丽媛郑东夏妍柳晓燕
Owner ZOTYE INT AUTOMOBILE TRADING CO LTD
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