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Nitrogen-boron co-doped carbon quantum dot coated nickel cobalt lithium aluminate battery cathode material and preparation method

A technology of lithium nickel cobalt aluminate and carbon quantum dots, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of not having rate performance and structural stability at the same time, and achieve the effect of reducing irreversible capacity and good coating protection , the effect of reducing the degree of volume change

Active Publication Date: 2019-08-06
GEM (HUBEI) NEW ENERGY MATERIALS CO LTD
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Problems solved by technology

[0003] In view of the above problems, the object of the present invention is to provide a nitrogen, boron co-doped carbon quantum dot coated nickel-cobalt lithium aluminate battery positive electrode material and its preparation method, aiming to solve the problem that the existing lithium-ion battery positive electrode materials cannot simultaneously have good Technical issues of rate performance and structural stability

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  • Nitrogen-boron co-doped carbon quantum dot coated nickel cobalt lithium aluminate battery cathode material and preparation method

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preparation example Construction

[0018] In this embodiment, the preparation method of the nitrogen and boron co-doped carbon quantum dots coated nickel-cobalt lithium aluminate battery positive electrode material, the method includes:

[0019] Step S1. Weigh citric acid monohydrate into a beaker, add ultrapure water to completely dissolve it to obtain a citric acid solution, then add a boron source and a nitrogen-containing compound to the citric acid solution, and disperse evenly by ultrasonic to obtain a uniformly mixed aqueous solution .

[0020] In this step, the concentration of the citric acid solution is 0.5-2g / mL, and the addition amount of the boron element in the boron source and the nitrogen element in the nitrogen-containing compound is 0.5-3% of the molar weight of the citric acid. The compound is one or more of urea, ammonia water, and ethylenediamine, and the boron source may be boric acid.

[0021] Step S2, reacting the aqueous solution in an oven for a period of time, then taking it out and ...

Embodiment 1

[0029] 1) Accurately weigh 50g of citric acid monohydrate in a beaker, add 50mL of ultrapure water to dissolve it completely, the final concentration of citric acid solution is 1g / mL, then add 2.9g of boric acid and 1.43g of ethylenediamine, and ultrasonicate for 30min to make the above The material is fully dispersed and uniform, and then placed in an oven with a heating rate of 10°C / min and thermally cracked at 200°C for 2.5 hours. After the reaction, naturally cool to room temperature to obtain a nitrogen and boron co-doped carbon quantum dot solution. 1g of the product was dissolved in 20mL of water with ultrapure water by means of ultrasound to form a nitrogen and boron co-doped carbon quantum dot solution;

[0030] 2) Mix lithium hydroxide and nickel cobalt aluminum hydroxide precursors in a high-speed mixer according to the lithium / metal molar ratio of 1.01, then place them in an atmosphere furnace and sinter at 790°C for 12 hours in an oxygen atmosphere, and naturally c...

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Abstract

The invention is applicable to the technical field of lithium batteries, and provides a nitrogen-boron co-doped carbon quantum dot coated nickel cobalt lithium aluminate battery cathode material and apreparation method. In the preparation process, a lithium ion battery cathode material is coated with nitrogen-boron co-doped carbon quantum dots, the N-containing groups in the carbon quantum dots can strengthen the interaction with Li, achieve a very good coating protection effect and inhibit the interaction between electrolyte and the cathode material, and boron can reduce the irreversible capacity loss. At the same time, the nano-scale pore passage structure formed after coating can reduce the volume change of the material during charging and discharging, and improve the stability of thematerial structure. Moreover, the carbon quantum dots have certain conductivity and can improve the transport rate of lithium ions in bulk phase. In addition, the untreated carbon quantum dots show certain acidity and can neutralize part of the residual alkali on the surface, and can carry out coating directly without washing. Finally, lithium ion batteries have excellent rate performance and cycle performance and good safety performance.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a nitrogen and boron co-doped carbon quantum dot-coated nickel-cobalt lithium aluminate battery cathode material and a preparation method. Background technique [0002] Nickel-cobalt-manganese or nickel-cobalt-aluminum ternary lithium-ion battery cathode materials are widely used in IT products and new energy vehicles due to their high energy density and relatively simple preparation process. However, pure lithium nickel cobalt manganate (LNCM) or lithium nickel cobalt aluminate (LNCA) has poor structural stability, and it is easy to deintercalate Li ions and the valence of Ni, Co, Mn / Al ions during charge and discharge. The change of the state causes the collapse of the material structure, which causes great harm to the cycle life and safety of the material. Surface coating is an effective method to improve the electrical properties of ternary materials. E...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/525H01M4/62
CPCH01M4/364H01M4/38H01M4/525H01M4/625Y02E60/10
Inventor 蒋振康周晓燕徐世国
Owner GEM (HUBEI) NEW ENERGY MATERIALS CO LTD
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