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A kind of ncm/lmo composite material based on microwave synthesis, preparation method and application thereof

A composite material and microwave synthesis technology, applied in the direction of structural parts, electrical components, battery electrodes, etc., can solve the problems of easy decomposition and release, aggravate the decomposition of positive electrode materials, and large-scale application restrictions, so as to change thermal stability and improve Thermal stability, improving the effect of the contact interface

Active Publication Date: 2020-05-22
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with other materials, the thermal stability of nickel-cobalt-manganese-lithium ternary materials is poor. When the temperature is higher than 200 ° C, it is easy to decompose and release oxygen, and may react with electrolyte and carbon materials, resulting in At the same time, it will further aggravate the decomposition of the positive electrode material. Such reciprocation will cause thermal runaway, deflagration will occur in a very short time, and there will be a greater safety risk. limits

Method used

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  • A kind of ncm/lmo composite material based on microwave synthesis, preparation method and application thereof
  • A kind of ncm/lmo composite material based on microwave synthesis, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] The NCM811 ternary precursor material ((Ni 8 co 1 mn 1 )(OH) 2 ) and 200mL of water were placed in a round-bottomed flask, and mechanically stirred for several hours; and NCM811 ternary precursor material according to the molar ratio of 5:1, weighed 6.32g of KMnO4 powder, placed in a round-bottomed flask and continued to stir until uniform; the round-bottomed flask Put it in a microwave reactor with 500W power to react for 30s, take it out and cool it, repeat the above operation 3 times, wash and filter after cooling, put the collected powder in a vacuum oven for several hours in vacuum drying, and obtain the NCM811 / LMO precursor (after ICP test get (Ni 0.8 co 0.1 mn 0.1 )(OH) 2 with MnO 2 The ratio is about 9:1). Weigh 10g of the NCM811 / LMO precursor, add lithium salt (Li 2 CO 3 ) 2.4g was pre-fired in an oxygen atmosphere furnace at 550°C for 4h, then heated to 800°C for 20h, and finally NCM811 / LMO composite was obtained after cooling.

[0035] Such as fig...

Embodiment 2

[0042] The NCM532 ternary precursor material ((Ni 5 co 3 mn 2 )(OH) 2 ) and 200mL of water were placed in a round bottom flask, and mechanically stirred for several hours; and the NCM811 ternary precursor material was weighed according to the molar ratio of 5:1 KMnO4 powder 12.64g was placed in a round bottom flask and continued to stir until uniform; the round bottom flask Put it in a microwave reactor with 500W power to react for 90s, take it out and cool it down, repeat the above operation 3 times, wash and filter after cooling, put the collected powder in a vacuum oven and dry it in vacuum for several hours to obtain the NCM532 / LMO precursor (after ICP test get (Ni 0.8 co 0.1 mn 0.1 )(OH) 2 with MnO 2 The ratio is about 9:2). Weigh 10g of the NCM532 / LMO precursor, add lithium salt (Li 2 CO 3 ) 2.75g was pre-fired in an oxygen atmosphere furnace at 550°C for 4h, then heated to 800°C for 20h, and finally NCM811 / LMO material was obtained after cooling.

[0043] Acc...

Embodiment 3

[0052] A method for synthesizing NCM / LMO composites based on microwaves, comprising the following steps:

[0053] (1) The NCM ternary precursor material (Ni 4 co 3 mn 3 )(OH) 2 Add water and stir, then add KMnO 4 The powder continues to stir; where (Ni 4 co 3 mn 3 )(OH) 2 with KMnO 4 The molar ratio is 10:1.

[0054] (2) Put the product of step (1) in a microwave reactor with a power of 100W to react for 180s;

[0055] (3) Take it out and cool it, then place it in a microwave reactor for 180s, repeat the above operation twice;

[0056] (4) washing and filtering after cooling, and drying the collected powder to obtain a composite material precursor;

[0057] (5) Add the composite material precursor to LiNO at a molar ratio of 1:1 3 and placed in an oxygen or air atmosphere furnace, pre-fired at 500°C for 12h, then heated to 850°C for 36h, and then cooled to obtain NCM / LMO composite material.

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Abstract

The invention provides a NCM / LMO composite material based on microwave synthesis, and a preparation method and an application thereof. The method includes: adding an NCM ternary precursor material towater with stirring, and adding KMnO4 powder and continuously stirring the solution; performing a reaction in a microwave reactor; moving out and cooling a product, and performing a reaction in the microwave reactor again, the operations hereinabove being repeated for 2-10 times; adding the product in lithium salt, and calcining the mixture in an oxygen or air atmosphere furnace; and cooling the calcined material to obtain the NCM / LMO composite material. Because the LMO uniformly grows on the surface of the NCM to form a stable LMO layer, compared with blending of the two components, the composite material improves the contact interface of the two components during composition and is effectively improved in thermal stability, thereby improving the security of a lithium ion battery.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a microwave-synthesized NCM / LMO composite material, a preparation method and an application thereof. Background technique [0002] Lithium-ion battery is a high-energy-density, high-efficiency energy storage device, which has been widely used in portable digital devices, electric vehicles and other fields. The lithium-ion battery system is composed of four key materials: positive electrode material, negative electrode material, separator and electrolyte. Therefore, the properties of the material are directly related to the performance of the lithium-ion battery. [0003] The recent stage is the golden age for the development of new energy vehicles. The mainstream positive electrode materials for vehicle power lithium-ion batteries include lithium iron phosphate, nickel-cobalt-manganese-lithium, nickel-cobalt-aluminum-lithium, lithium manganate, etc., and nickel-cobalt-mangane...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525
CPCH01M4/364H01M4/505H01M4/525Y02E60/10
Inventor 李坤郑刚樊少娟朱新平杨茂萍
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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