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Positive electrode active material and preparation method thereof, positive electrode and lithium ion battery

A technology of positive electrode active materials and ternary materials, which is applied in the field of preparation of positive electrode active materials, and can solve problems such as high energy consumption, high cost, and cumbersome process

Active Publication Date: 2022-01-07
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, it is necessary to provide a preparation method of positive electrode active material, to solve the shortcomings of the existing NCM ternary positive electrode active material preparation method of complex process, high energy consumption and high cost

Method used

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  • Positive electrode active material and preparation method thereof, positive electrode and lithium ion battery
  • Positive electrode active material and preparation method thereof, positive electrode and lithium ion battery
  • Positive electrode active material and preparation method thereof, positive electrode and lithium ion battery

Examples

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preparation example Construction

[0050] The embodiment of the present application provides a method for preparing a positive electrode active material, comprising the following steps:

[0051] Step S1: providing nickel salt, cobalt salt, manganese salt, lithium salt, strong lye, and coated co-dopants;

[0052] Step S2: mixing the nickel salt, cobalt salt, manganese salt, and strong lye to obtain a mixed solution;

[0053] Step S3: Under an inert atmosphere, heat the mixed solution to obtain a nickel-cobalt-manganese precursor, the structural formula of the nickel-cobalt-manganese precursor is Ni x co y mn z (OH) 2 , wherein, x+y+z=1, 0.33<x<1, 0<y<0.33, 0<z<0.33;

[0054] Step S4: mixing the nickel-cobalt-manganese precursor, the lithium salt, and the coated co-dopant to obtain a mixture;

[0055] Step S5: Sintering the mixture under an oxygen atmosphere to obtain a positive electrode active material, the positive electrode active material includes a nickel-cobalt-manganese ternary material and a coating...

Embodiment 1

[0107] Provides Ni(NO 3 ) 2 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O, Mn(NO 3 ) 2 ·6H 2 O, water, wherein the molar ratio of Ni:Co:Mn is 8:1:1;

[0108] Ni(NO 3 ) 2 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O, Mn(NO 3 ) 2 ·6H 2 O is added to water to obtain a mixed solution, and the sum of the ion concentrations of the mixed solution is 2mol / L;

[0109] Provide the sodium hydroxide solution that concentration is 4mol / L and the ammonia solution that concentration is 4mol / L;

[0110] Pour the mixed solution, sodium hydroxide solution, and ammonia solution into the reactor simultaneously at the speed of 30ml / min, 10ml / min, and 8ml / min, respectively, to obtain a mixed solution with a pH value of 11.2;

[0111] Heating the mixed solution to 50°C, feeding nitrogen gas into the reactor, and continuously stirring the mixed solution at a speed of 300r / min, and filtering to obtain nickel-cobalt-manganese precursor precipitation;

[0112] After washing the precipitation of the nickel-cobalt-mang...

Embodiment 2

[0125] The difference from Example 1 includes: in the mixture, the mass percentage content of the sodium monofluorophosphate is 1wt.%.

[0126] Other steps are the same as in Embodiment 1 and will not be repeated.

[0127] see image 3 , the XRD diffraction peaks of the positive electrode active material in Example 2 are sharp, indicating that the positive electrode active material in Example 2 has high crystallinity and no impurity phase.

[0128] see Figure 4 , the positive electrode active material in the second embodiment has a coating layer.

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Abstract

The invention discloses a preparation method of a coated co-doped modified positive electrode active material. The preparation method comprises the following steps of: providing a nickel salt, a cobalt salt, a manganese salt, a lithium salt, a strong alkali solution and a coated co-doping agent; mixing the nickel salt, the cobalt salt, the manganese salt and the strong alkali solution to obtain a mixed solution; in an inert atmosphere, heating the mixed solution to obtain a nickel-cobalt-manganese precursor; mixing the nickel-cobalt-manganese precursor, the lithium salt, and the coated a co-doping agent to obtain a mixture; and sintering the mixture in an oxygen atmosphere to obtain the positive electrode active material which comprises a nickel-cobalt-manganese ternary material and a coating layer coating the nickel-cobalt-manganese ternary material. The invention also provides a positive electrode active material prepared by the preparation method of the positive electrode active material, a positive electrode applying the positive electrode active material, and a lithium ion battery applying the positive electrode. The preparation method of the positive electrode active material has the advantages of simple process, energy conservation, high efficiency and low production cost.

Description

technical field [0001] The present application relates to the technical field of lithium ion batteries, in particular to a method for preparing a positive electrode active material, a positive electrode active material prepared by the method for preparing the positive electrode active material, a positive electrode using the positive electrode active material, and an application of the positive electrode active material. positive lithium-ion battery. Background technique [0002] With the rapid development of electric vehicles, people's requirements for power batteries continue to increase. At present, lithium-ion batteries have become the most promising power batteries due to their good performance and low cost. [0003] Nickel-cobalt-manganese (NCM) ternary positive electrode active materials that can be applied to lithium-ion batteries have the advantages of high specific capacity, good cycle performance, stable structure, and low cost. However, the existing NCM ternary...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/36H01M4/13H01M4/525H01M4/505H01M10/0525Y02E60/10
Inventor 巫芳婷赵成龙李宝华康飞宇
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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