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Preparation method of carbon quantum dot modified LiFePO4 positive electrode material

A cathode material, carbon quantum dot technology, applied in the direction of positive electrode, active material electrode, battery electrode, etc., can solve the problems of unsatisfactory binding effect of lithium iron phosphate, low expansion coefficient of carbon layer, and reduced rate performance, etc., to achieve excellent Effect of rate capability, improved conductivity, and easy modification

Active Publication Date: 2020-08-11
南通鼎鑫电池有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is mainly to coat a layer of carbon coating on the surface of lithium iron phosphate to improve the conductivity of lithium iron phosphate, but the effect of improving conductivity is related to factors such as the degree of graphitization of the carbon layer, and the expansion coefficient of the carbon layer is very low, and phosphoric acid Most of the binding effects of iron-lithium are not ideal, and the initial conductivity is better, but after a certain period of charge and discharge, the stability of the conductivity improvement will decrease, and the performance under high-current charging conditions is not ideal, and the rate performance is reduced.

Method used

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  • Preparation method of carbon quantum dot modified LiFePO4 positive electrode material
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  • Preparation method of carbon quantum dot modified LiFePO4 positive electrode material

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Embodiment 1

[0050] see figure 1 , a carbon quantum dot modified LiFePO4 positive electrode material preparation method, comprising the following steps:

[0051] S1. Weigh 5 g of analytically pure ferrous salt and dissolve it in 50 mL of distilled water to obtain solution A;

[0052] S2, get analytically pure phosphoric acid 5ml, add distilled water and obtain diluting to 60mL and obtain phosphoric acid solution B;

[0053] S3. Weigh 10 g of analytically pure lithium phosphate and dissolve it in 50 mL of distilled water to obtain solution C;

[0054] S4, solution C is placed on self-sterilizing magnetic stirrer, rotating speed 400r / min, dropwise A and B solution simultaneously in solution C, stir while adding dropwise, the precipitate produced is centrifuged and washed 3 times with distilled water, Oven drying at 60°C to obtain precipitate D;

[0055] S5, take chitosan 5g, be dissolved in 50mL mass fraction 20% acetic acid solution, obtain mixed solution E;

[0056] S6. Stir the soluti...

Embodiment 2

[0061] see figure 1 , a carbon quantum dot modified LiFePO4 positive electrode material preparation method, comprising the following steps:

[0062] S1. Weigh 25 g of analytically pure ferrous salt and dissolve it in 100 mL of distilled water to obtain solution A;

[0063] S2, get analytically pure phosphoric acid 25ml, add distilled water and obtain and dilute to 60mL and obtain phosphoric acid solution B;

[0064] S3. Weigh 25g of analytically pure lithium phosphate and dissolve it in 80mL of distilled water to obtain solution C;

[0065] S4, solution C is placed on self-sterilizing magnetic stirrer, rotating speed 400r / min, dropwise A and B solution simultaneously in solution C, stir while adding dropwise, the precipitate produced is centrifuged and washed 3 times with distilled water, Oven drying at 60°C to obtain precipitate D;

[0066] S5, weigh chitosan 10g, be dissolved in 50mL mass fraction 40% acetic acid solution, obtain mixed solution E;

[0067] S6. Stir the s...

Embodiment 3

[0072] see figure 1 , a carbon quantum dot modified LiFePO4 positive electrode material preparation method, comprising the following steps:

[0073] S1. Weigh 10 g of analytically pure ferrous salt and dissolve it in 75 mL of distilled water to obtain solution A;

[0074] S2, get analytically pure phosphoric acid 15ml, add distilled water and obtain and dilute to 60mL and obtain phosphoric acid solution B;

[0075] S3. Weigh 15g of analytically pure lithium phosphate and dissolve it in 60mL of distilled water to obtain solution C;

[0076] S4, solution C is placed on self-sterilizing magnetic stirrer, rotating speed 400r / min, dropwise A and B solution simultaneously in solution C, stir while adding dropwise, the precipitate produced is centrifuged and washed 3 times with distilled water, Oven drying at 60°C to obtain precipitate D;

[0077] S5, take chitosan 5g, be dissolved in 50mL mass fraction 30% acetic acid solution, obtain mixed solution E;

[0078] S6. Stir the solu...

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Abstract

The invention discloses a preparation method of a carbon quantum dot modified LiFePO4 positive electrode material and belongs to the field of a preparation method of lithium ion battery cathode materials. The preparation method of the carbon quantum dot modified LiFePO4 positive electrode material, chitosan is adopted as a carbon source, carbon quantum dot modification is performed on a surface oflithium iron phosphate, carbon quantum dot modification is performed on the surface of lithium iron phosphate by adopting a two-step method of combining microwave ultrasonic treatment with hydrothermal carbonization, the preparation method is simple, and the prepared material is uniform in particle size and distribution and has a relatively large specific surface area; the surface of the lithiumiron phosphate is modified by the carbon quantum dots, so more active sites can be exposed, compared with the prior art, more space is provided for lithium ion storage, meanwhile, conductivity of lithium iron phosphate is better improved, the rate capability is excellent, in addition, a self-disinfection magnetic stirrer with a safety disinfection cover used in the manufacturing process can achieve the disinfection effect on the reaction environment in the container, and safety of operators in the manufacturing process is improved.

Description

technical field [0001] The invention relates to the field of preparation methods of lithium-ion battery positive electrode materials, and more specifically, relates to a preparation method of carbon quantum dot modified LiFePO4 positive electrode materials. Background technique [0002] The main constituent materials of lithium-ion batteries include electrolyte, separator materials, positive and negative electrode materials, etc. The positive electrode material occupies a large proportion (the mass ratio of positive and negative electrode materials is 3:1-4:1), because the performance of the positive electrode material directly affects the performance of the lithium-ion battery, and its cost also directly determines the cost of the battery. The new technology of microwave drying is used to dry lithium battery positive electrode materials, which solves the problems of long drying time of conventional lithium battery positive electrode materials, slow capital turnover, uneven ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/364H01M4/5825H01M4/625H01M10/0525H01M2004/028Y02E60/10
Inventor 黄剑锋
Owner 南通鼎鑫电池有限公司
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