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Ternary cathode material modified by carbon quantum dots and preparation method thereof

A positive electrode material and carbon quantum dot technology, which is applied in the direction of electrical components, battery electrodes, electrochemical generators, etc., can solve the problems of affecting the specific capacity of materials, high preparation costs, high coating amount, etc., to achieve uniform distribution and reduce alkali content , the effect of improving conductivity

Active Publication Date: 2019-06-07
LANGFANG GREEN IND TECH CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This technology helps improve the properties of lithium ion batteries by modifying their materials through adding certain substances that help them work better together or even out defective ones caused by factors like high temperatures or overcharging. It also includes methods such as microswitchable graphene oxide (MGO) synthesis, chemical vapor deposition, thermal evaporation techniques, laser ablation, etc., resulting in improved battery characteristics without compromising its overall effectiveness.

Problems solved by technology

This patents discuss various techniques related to making better quality battery components (such as lithi ion cells). These improvements include enhancing the electrical properties of these components while maintaining good stability during operation. Additionally, they highlight how effective utilization of existing resources like iron sources may lead to increased production costs associated with upgrading. Therefore, technical solutions are needed to enhance both efficiency and product yield without compromising any other factors involved.

Method used

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  • Ternary cathode material modified by carbon quantum dots and preparation method thereof
  • Ternary cathode material modified by carbon quantum dots and preparation method thereof

Examples

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Embodiment 1

[0040] This embodiment provides a ternary positive electrode material modified with carbon quantum dots, the molecular formula of the ternary positive electrode material is LiNi 0.85 co 0.05 mn 0.1 o 2 , with carbon quantum dots distributed on its surface; wherein, the mass fraction of carbon quantum dots is 1%.

[0041] Prepare as follows:

[0042] (1) Dissolve citric acid in water and set the volume to 100mL to obtain a carbon precursor solution, then add a ternary positive electrode material to it in proportion, and use a high-speed mixer to mix evenly to obtain a mixed slurry;

[0043] (2) Under an air atmosphere, use microwaves to process the mixed slurry obtained in step (1) for 40 minutes. The power of the microwaves is 1500 W. After the treatment is completed, the ternary positive electrode material modified with carbon quantum dots is obtained.

[0044] SEM and XRD tests are carried out on the ternary positive electrode material modified by the obtained carbon qua...

Embodiment 2

[0047] This embodiment provides a ternary positive electrode material modified with carbon quantum dots, the molecular formula of the ternary positive electrode material is LiNi 0.5 co 0.3 mn 0.2 o 2 , with carbon quantum dots distributed on its surface; wherein, the mass fraction of carbon quantum dots is 0.5%.

[0048] Prepare as follows:

[0049] (1) Dissolve citric acid in water and set the volume to 100mL to obtain a carbon precursor solution, then add a ternary positive electrode material to it, and use a high-speed mixer to mix evenly to obtain a mixed slurry;

[0050] (2) Under an air atmosphere, use microwaves to process the mixed slurry obtained in step (1) for 60 minutes. The power of the microwaves is 500 W. After the treatment is completed, the ternary positive electrode material modified with carbon quantum dots is obtained.

[0051] After testing, the rate performance 10C / 1C ratio of the obtained material reaches 0.90, the specific capacity is 173.8mAh / g und...

Embodiment 3

[0053] This embodiment provides a ternary positive electrode material modified with carbon quantum dots, the molecular formula of the ternary positive electrode material is LiNi 0.6 co 0.2 mn 0.2 o 2 , with carbon quantum dots distributed on its surface; wherein, the mass fraction of carbon quantum dots is 0.2%.

[0054] Prepare as follows:

[0055] (1) Dissolve lactic acid in ethanol and set the volume to 100mL to obtain a carbon precursor solution, then add a ternary positive electrode material to it, and use a high-speed mixer to mix evenly to obtain a mixed slurry;

[0056] (2) Under an oxygen atmosphere, use microwaves to process the mixed slurry obtained in step (1) for 5 minutes. The power of the microwaves is 3000 W. After the treatment is completed, the ternary positive electrode material modified with carbon quantum dots is obtained.

[0057] After testing, the rate performance 10C / 1C ratio of the obtained material reaches 0.88, the specific capacity is 178.1mAh / ...

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Abstract

The present invention relates to a ternary cathode material modified by carbon quantum dots and a preparation method thereof. The ternary cathode material is a nickel-cobalt-manganese ternary cathodematerial and has a molecular formula of LiNixCoyMnzO2, wherein 0<=x<1, 0<=y<1, 0<=z<1, and x+y+z=1; and the carbon quantum dots are distributed at the surface of the ternary cathode material. The carbon quantum dots are employed to modify the ternary cathode material to reduce the material surface alkali content, effectively improve the material electrical conductivity and improve the rate capability and the cycle performance of the material. In the preparation process, a microwave pyrolysis method is employed to perform in-situ pyrolysis at the surface of the ternary cathode material to generate the carbon quantum dots, the carbon quantum dots are more uniformly distributed, and in the preparation process, the temperature of the system is low, so that the problem is solved that the transition metal is subjected to carbon reduction when the surface of the ternary cathode material is coated with the carbon material.

Description

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Claims

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Application Information

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Owner LANGFANG GREEN IND TECH CENT
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