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

A technology of positive electrode active material and ternary material, applied in the field of preparation of positive electrode active material, can solve the problems of high cost, high energy consumption, complicated process and the like

Active Publication Date: 2022-07-22
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • 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, lithium ion battery
  • Positive electrode active material and preparation method thereof, positive electrode, lithium ion battery
  • Positive electrode active material and preparation method thereof, positive electrode, lithium ion battery

Examples

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preparation example Construction

[0050] The embodiments of the present application provide 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 alkali solution, and coating co-dopant;

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

[0053] Step S3: under an inert atmosphere, the mixed solution is heated to obtain a nickel-cobalt-manganese precursor, and the structural formula of the nickel-cobalt-manganese precursor is Ni x Co y Mn z (OH) 2 , where 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, lithium salt, and coating co-dopant to obtain a mixture;

[0055] Step S5: sintering the mixture in an oxygen atmosphere to obtain a positive electrode active material, the positive electrode active material includes a nickel-cobalt-manganese ternary ma...

Embodiment 1

[0107] Provide 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] The Ni (NO 3 ) 2 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O, Mn (NO 3 ) 2 ·6H 2 O is added to the water to obtain a mixed solution, and the total ion concentration of the mixed solution is 2mol / L;

[0109] Provide a sodium hydroxide solution with a concentration of 4mol / L and an aqueous ammonia solution with a concentration of 4mol / L;

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

[0111] The mixed solution was heated to 50° C., nitrogen was introduced into the reactor, and the mixed solution was continuously stirred at a rotational speed of 300 r / min, and filtered to obtain nickel-cobalt-manganese precursor precipitation;

[0112] After washing the nic...

Embodiment 2

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

[0126] Other steps are the same as those in the first embodiment, and will not be repeated.

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

[0128] see Figure 4 , the cathode active material of the second embodiment has a coating layer.

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Abstract

A method for preparing a coating and co-doping modified positive electrode active material, comprising the following steps: providing nickel salt, cobalt salt, manganese salt, lithium salt, strong alkali solution, and coating co-dopant; mixing the nickel salt , cobalt salt, manganese salt, and strong alkali solution to obtain a mixed solution; under an inert atmosphere, heat the mixed solution to obtain a nickel-cobalt-manganese precursor; mix the nickel-cobalt-manganese precursor, lithium salt, coating co-dopants to obtain a mixture; and in an oxygen atmosphere, sintering the mixture to obtain a positive electrode active material, the positive electrode active material includes a nickel-cobalt-manganese ternary material and a nickel-cobalt-manganese ternary material coated on the nickel-cobalt-manganese ternary The cladding outside the material. The present application also provides 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 a lithium ion battery using the positive electrode. The preparation method of the positive electrode active material of the present application has the advantages of simple process, energy saving and high efficiency, and low production cost.

Description

technical field [0001] The present application relates to the technical field of lithium ion batteries, and in particular to a method for preparing a positive electrode active material, a positive electrode active material prepared by the method for preparing a positive electrode active material, a positive electrode using the positive electrode active material, and a positive electrode using the positive electrode active material. Positive Lithium Ion Batteries. 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 cathode active materials that can be used in 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 Patents(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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