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A kind of carbon quantum dot modified ternary cathode material and preparation method thereof

A positive electrode material, carbon quantum dot technology, applied in the direction of electrical components, battery electrodes, structural parts, etc., can solve the problems of affecting the specific capacity of the material, high production cost, high coating amount, etc., to achieve uniform distribution, reduce alkali content, improve The effect of conductivity

Active Publication Date: 2022-04-15
LANGFANG GREEN IND TECH CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the equipment of the chemical vapor deposition method is more complicated, the preparation cost is higher, and the coating amount is higher, which affects the specific capacity of the material.
[0005] The above methods all use carbon materials to coat the ternary cathode material to improve its electrochemical performance, but from the perspective of the material itself and the preparation method, there is still room for further improvement in the performance of the obtained material

Method used

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  • A kind of carbon quantum dot modified ternary cathode material and preparation method thereof
  • A kind of carbon quantum dot modified ternary cathode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] This embodiment provides a three-dimensional positive material of a carbon quantum point modified, the molecular formula of the ternary positive electrode material is Lini 0.85 CO 0.05 Mn 0.1 O 2 The surface is distributed with carbon quantum dots; wherein the mass fraction of carbon quantum dots is 1%.

[0041] Preparation according to the following method:

[0042] (1) The citric acid is dissolved in water, and it is allowed to 100 mL to obtain a carbon precursor, and then the three-dimensional positive electrode material is added thereto, and the mixed slurry is mixed by the high speed mixture;

[0043] (2) Under the air atmosphere, the mixed slurry obtained by the microwave to the step (1) is treated with a mixed slurry of step (1), and the power of the microwave is 1500W, and the treatment is completed to obtain the tri-element material of the carbon quantum dot.

[0044] SEM and XRD testing of the three-dimensional positive material modified to the obtained carbon qua...

Embodiment 2

[0047] This embodiment provides a three-dimensional positive material of a carbon quantum point modified, the molecular formula of the ternary positive electrode material is Lini 0.5 CO 0.3 Mn 0.2 O 2 The surface is distributed with carbon quantum dots; wherein the mass fraction of carbon quantum dots is 0.5%.

[0048] Preparation according to the following method:

[0049] (1) dissolve the citric acid into the water, set to 100 mL, to obtain a carbon precursor, and then add a three-dimensional positive electrode material, and mix the mixed slurry by mixing the high-speed mixing machine.

[0050] (2) Under the air atmosphere, the mixed slurry obtained by the microwave to process the mixed slurry obtained by the step (1), the power of 500W of the microwave is 500 W, and the treatment is completed to obtain the tri-element positive material of the carbon quantum dot.

[0051] After detection, the resulting material of the resulting material 10c / 1c ratio of 0.90, 0.2c charge and di...

Embodiment 3

[0053] This embodiment provides a three-dimensional positive material of a carbon quantum point modified, the molecular formula of the ternary positive electrode material is Lini 0.6 CO 0.2 Mn 0.2 O 2 The surface is distributed with carbon quantum dots; wherein the mass fraction of carbon quantum dots is 0.2%.

[0054] Preparation according to the following method:

[0055] (1) The lactic acid is dissolved into ethanol, allowed to 100 mL to obtain a carbon precursor, and then add a triplet positive material to the mixed slurry by mixing a high-speed mixing machine to obtain a mixed slurry;

[0056] (2) In the oxygen atmosphere, the mixed slurry obtained by the microwave by microwave is treated for 5 min, and the power of the microwave is 3000W, and the treatment is completed to obtain the tri-element positive material of the carbon quantum dot.

[0057] After detection, the resulting material of the resulting material 10C / 1C ratio of 0.88, 0.2c charge and discharge conditions we...

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Abstract

The invention relates to a ternary cathode material modified with carbon quantum dots and a preparation method thereof. The ternary cathode material is a nickel-cobalt-manganese ternary cathode material with a molecular formula of LiNi x co y mn z o 2 , wherein 0≤x<1, 0≤y<1, 0≤z<1, and x+y+z=1; carbon quantum dots are distributed on the surface of the ternary positive electrode material. The invention uses carbon quantum dots to modify the ternary cathode material, reduces the alkali content on the surface of the material, effectively improves the conductivity of the material, and improves the rate performance and cycle performance of the material. During the preparation process, the microwave pyrolysis method is used to generate carbon quantum dots in situ on the surface of the ternary cathode material. The distribution of the carbon quantum dots is more uniform, and the temperature of the system is lower during the preparation process, which solves the problem of coating the carbon material on the surface of the ternary material. When transition metals are reduced by carbon.

Description

Technical field [0001] The present invention relates to the field of lithium ion battery positive electrode material, and more particularly to a three-dimensional positive electrode material modified with carbon quantum dots and a preparation method thereof. Background technique [0002] The rapid development of electric vehicles continuously puts forward new requirements for the improvement of energy density and power density of lithium ion batteries. Nickel-wateng manganese three-dimensional material material has received extensive attention due to high-volume capacity, long cycle life, low toxicity and cheap feature. In particular, nickel is its main component in an oxidative reducing energy, and is the current research focus by increasing the specific capacity of the nickel content to improve the material. [0003] However, the main problem in terms of ternary materials, especially the high-nickel-based three-membered materials is that the surface is too high, and the electro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/583H01M10/0525
CPCY02E60/10
Inventor 谭强强王鹏飞
Owner LANGFANG GREEN IND TECH CENT
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