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Preparation method of positive electrode material of lithium ion battery and product thereof

A lithium-ion battery and positive electrode material technology, applied in the field of electrochemical batteries, can solve the problems of unfavorable industrial production and complicated process, and achieve the effects of improving specific capacity and cycle stability, being environmentally friendly, and slowing down the generation of intergranular cracks

Pending Publication Date: 2021-04-06
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These modification methods can make the mixing of raw materials reach the atomic level, but the reaction process must strictly control the experimental conditions, and the process is very complicated, which is not conducive to industrial production

Method used

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  • Preparation method of positive electrode material of lithium ion battery and product thereof
  • Preparation method of positive electrode material of lithium ion battery and product thereof
  • Preparation method of positive electrode material of lithium ion battery and product thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The preparation of lithium ion battery cathode material comprises the following steps:

[0035] Weigh LiNi according to the mass ratio of 1:0.03 0.5 co 0.2 mn 0.3 o 2 ,MoS 2 , mix evenly, place in a mixing granulator, adjust the power to 5KW, react for 5 minutes, take it out and place it in an atmosphere furnace, sinter in an air atmosphere at 350°C for 7h, and cool naturally to room temperature to obtain the lithium-ion battery Cathode material, its transmission electron microscope picture is as follows figure 1 shown.

[0036]Battery production and testing: Weigh 0.8g of the lithium-ion battery cathode material prepared above, add 0.1g of acetylene black, 0.1g of PVDF dissolved in N-N dimethyl pyrrolidone polyvinylidene fluoride binder , mixed uniformly to form a slurry, evenly coated on aluminum foil, in an argon atmosphere glove box, with metal lithium sheet as a counter electrode, Celgard2400 as a diaphragm, 1mol / L LIPF6 (EC:DEC:DMC=1:1:1 ) is the electrolyt...

Embodiment 2

[0038] Preparation of cathode materials for lithium-ion batteries:

[0039] Weigh Li according to the mass ratio of 1:0.015:0.025 1.2 mn 0.54 Ni 0.13 co 0.13 o 2 、MoS 2 and NaNbO 3 , mix evenly, place in a mixing granulator, adjust the power to 3KW, react for 7 minutes, take it out and place it in an atmosphere furnace, sinter at 450°C for 3h in an oxygen-enriched atmosphere (oxygen volume fraction is 30%), and cool naturally to At room temperature, the positive electrode material for the lithium ion battery is obtained.

[0040] The manufacturing and testing methods of the battery are the same as those in Example 1, except that the voltage range during testing is 2.0V-4.8V.

Embodiment 3

[0042] Weigh Li according to the mass ratio of 1:0.06 1.2 mn 0.6 Ni 0.2 o 2 and NaNbO 3 , mix evenly, place in a mixing granulator, adjust the power to 1KW, react for 12 minutes, take it out and place it in an atmosphere furnace, and sinter at 500°C for 2 hours in an oxygen-enriched atmosphere (oxygen volume fraction is 30%), and cool naturally to At room temperature, the positive electrode material for the lithium ion battery is obtained.

[0043] The manufacturing and testing methods of the battery are the same as those in Example 1, except that the voltage range during testing is 2.0V-4.8V.

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Abstract

The invention discloses a preparation method of a positive electrode material of a lithium ion battery and a product thereof, belonging to the technical field of electrochemical batteries. The method comprises the following steps: mixing a manganese-based positive electrode material of the lithium ion battery and a modification body, performing granulating, and conducting sintering to obtain the positive electrode material of the lithium ion battery. According to the invention, a high-electron conductor or a high-ion conductor is used as a modifier for uniformly modifying the surface of the positive electrode material by adopting a solid-phase fusion technology, and the thickness of a modification layer can be controlled by adjusting a mass ratio of the manganese-based positive electrode material of the lithium ion battery to the modification body; the surface of the modified positive electrode material of the lithium ion battery is more stable, dissolution of transition metal ions and generation of cracks between particles in the circulation process are slowed down, and the specific capacity and the circulation stability of the positive electrode material of the lithium ion battery are effectively improved; and the preparation method disclosed by the invention is friendly to environment, free of pollution and low in process cost.

Description

technical field [0001] The invention belongs to the technical field of electrochemical batteries, and in particular relates to a preparation method of a positive electrode material of a lithium ion battery and a product thereof. Background technique [0002] At present, commercialized lithium-ion batteries have been widely used in portable electronic products. At the same time, lithium-ion batteries are now transforming into power battery systems for high-power fields such as energy storage, pure electric vehicles, and hybrid electric vehicles. The specific energy requirement of the lithium-ion power battery system has reached 300Wh / kg. Therefore, increasing the specific capacity of the cathode material plays a decisive role in building a lithium-ion battery with a high specific capacity. Traditional lithium-ion battery manganese-based materials such as Li 2 MnO 4 , LiMnO 2 etc., because of the lower theoretical specific capacity (<200mAh / g), it is difficult to meet th...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/36H01M4/505H01M10/0525H01M10/42
CPCH01M4/0404H01M4/366H01M4/505H01M10/0525H01M10/4235Y02E60/10
Inventor 李向南杨书廷岳红云尹艳红董红玉
Owner HENAN NORMAL UNIV
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