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Doped positive electrode material precursor and preparation method and application thereof, doped positive electrode material and preparation method and application thereof

A positive electrode material and doping technology, applied in chemical instruments and methods, battery electrodes, inorganic chemistry, etc., can solve the problems of low particle strength and failure to meet actual needs, and achieve low process cost, high reliability of results, and realization of low difficulty effect

Active Publication Date: 2021-05-14
BEIJING EASPRING MATERIAL TECH CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The object of the present invention is to provide a doped positive electrode material precursor, its preparation method and application, and a doped positive electrode material precursor in order to overcome the problem that the particle strength of the positive electrode material for lithium ion batteries in the prior art is low and cannot meet the actual needs. The positive electrode material and its preparation method and application, in the preparation method of the positive electrode material precursor, by adding specific doping elements in different stages of wet synthesis, the growth path and internal structure of the precursor are directional controlled; the strengthened structure Types of precursors are sintered with lithium salts to finally obtain the desired lithium-ion battery cathode material with higher particle strength

Method used

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  • Doped positive electrode material precursor and preparation method and application thereof, doped positive electrode material and preparation method and application thereof
  • Doped positive electrode material precursor and preparation method and application thereof, doped positive electrode material and preparation method and application thereof

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preparation example Construction

[0047] The first aspect of the present invention provides a method for preparing a doped cathode material precursor, characterized in that the method comprises the following steps:

[0048] (1) nickel salt, cobalt salt, and manganese salt are configured as a mixed salt solution; precipitant, complexing agent, and doping elements are respectively configured as a solution;

[0049] (2) In an inert atmosphere, add the mixed salt solution, precipitating agent solution, and complexing agent solution obtained in step (1) into the reactor, and start the co-precipitation reaction;

[0050] (3) At different stages of the co-precipitation reaction process described in step (2), the doping element solution is added in the reactor for n times, and the co-precipitation reaction is carried out to obtain the doped nickel-cobalt-manganese hydroxide, 2≤n≤5;

[0051] (4) Washing and drying the doped nickel-cobalt-manganese hydroxide obtained in step (3) to obtain the doped cathode material pre...

Embodiment 1

[0135] Prepare 1.5mol / L nickel-cobalt-manganese sulfate mixed solution (molar ratio Ni:Co:Mn=50:20:30), 3mol / L NaOH solution, 3mol / L ammonia water, and mix the above solutions in parallel The method was passed into the reaction kettle, the reaction temperature was kept at 50°C, and the reaction pH value was 11. Under the nitrogen protection atmosphere, the synthesis reaction was started, and the total reaction time was set at 200h. When the reaction was carried out to 60h, add 3g / L titanium sulfate (Ti(SO 4 ) 2 9H 2 (2) solution, carry out co-precipitation reaction; When reaction is carried out to 140h, add the 5g / L sodium metaaluminate (NaAlO 2 ) solution for co-precipitation reaction. After 200 hours of reaction, washing, drying at 120°C, and sieving, the desired doped multi-component nickel-cobalt-manganese hydroxide precursor Ni 0.496 co 0.197 mn 0.298 Ti 0.003 Al 0.002 (OH) 2 . Wherein, n=2, a2 ​​is 3, and b2 is 7.

[0136] Take the above-mentioned doped nickel...

Embodiment 2

[0141] Prepare 1.8mol / L nickel-cobalt nitrate mixed solution (molar ratio Ni:Co:Mn=63:17:20), 5mol / L NaOH solution, 5mol / L ammonia water, and mix the above solutions in parallel The method is passed into the reaction kettle, the reaction temperature is kept at 55° C., and the reaction pH value is 11.5. Under the nitrogen protection atmosphere, the synthesis reaction is started, and the total reaction time is set at 180 h. When the reaction was carried out to 36h, add 4g / L zirconium sulfate (Zr(SO 4 ) 2 4H 2 (0) solution, carry out co-precipitation reaction; When reaction is carried out to 72h, add the 10g / L strontium nitrate (Sr(NO 3 ) 2 ) solution, carry out co-precipitation reaction; when the reaction is carried out to 135h, add the 12g / L barium nitrate (Ba(NO 3 ) 2 ) solution for co-precipitation reaction. After 180 hours of reaction, washing, drying at 120°C, and sieving, the desired doped multi-component nickel-cobalt-manganese hydroxide precursor Ni 0.622 co 0.16...

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Abstract

The invention relates to the field of lithium ion batteries, and discloses a doped positive electrode material precursor and a preparation method and application thereof, and a doped positive electrode material and a preparation method and application thereof. The preparation method comprises the following steps: (1) preparing nickel salt, cobalt salt and manganese salt into a mixed salt solution; and respectively preparing a precipitant, a complexing agent and a doping element into solutions; (2) in an inert atmosphere, adding the mixed salt solution, the precipitant solution and the complexing agent solution into a reaction kettle for reaction; and (3) at different stages of the reaction, adding the doped element solution into the reaction kettle for n times for reaction to obtain a doped nickel-cobalt-manganese hydroxide, and washing and drying to obtain the doped positive electrode material precursor. Specific doping elements are added in different stages of wet synthesis, and the growth path and the internal structure of a precursor are directionally controlled; and sintering reaction is carried out on the precursor with the reinforced structure type and lithium salt to obtain a lithium ion battery positive electrode material finished product with relatively high particle strength.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a doped positive electrode material precursor and its preparation method and application, doped positive electrode material and its preparation method and application. Background technique [0002] Since its inception in 1990, lithium-ion batteries have been widely researched and applied due to their advantages such as high open circuit voltage, high specific energy, long service life, no memory, and small self-discharge. With the progress and development of lithium-ion battery technology, currently, lithium-ion batteries are not only widely used in various portable electronic products, but also actively expand to the fields of electric vehicles, medical supplies, aerospace and national defense. Cathode material is one of the important components of lithium-ion batteries. With the continuous evolution and development of lithium battery materials and the market demand for high...

Claims

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Application Information

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IPC IPC(8): C01G53/00H01M4/485H01M4/505H01M4/525H01M10/0525
CPCC01G53/006H01M4/505H01M4/525H01M4/485H01M10/0525C01P2006/40C01P2006/12C01P2004/61C01P2004/03Y02E60/10
Inventor 孙立国张永强宋顺林刘亚飞陈彦彬
Owner BEIJING EASPRING MATERIAL TECH CO LTD
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