Ternary positive electrode material and preparation method and application thereof

A technology of positive electrode materials and mixtures, which is applied in the field of lithium-ion batteries, can solve problems such as the inability to uniformly distribute doped metals, the inconspicuous improvement in the performance of ternary materials, and the uneven mixing of mechanical high-mixing, so as to achieve excellent electrochemical performance and improve The uniformity of doping and the effect of reducing the residual alkali content

Active Publication Date: 2022-01-07
HEFEI GUOXUAN HIGH TECH POWER ENERGY CO LTD CO LTD
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AI Technical Summary

Problems solved by technology

[0005] In order to ensure the effect of doping, the doping material needs to be evenly distributed on the surface of the ternary material precursor, but the traditional doping method is to use a high-mixer to mechanically and physically mix the doping material with the precursor and lithium source. The amount is usually added at a ratio of 200-10000ppm. On the one hand, the amount of doped metal is extremely low compared to the content of raw materials; on the other hand, there is uneven mixing in high mechanical mixing, so that the doped metal cannot be evenly distributed in the material
The above situation leads to the insignificant improvement of the performance of ternary materials

Method used

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  • Ternary positive electrode material and preparation method and application thereof
  • Ternary positive electrode material and preparation method and application thereof
  • Ternary positive electrode material and preparation method and application thereof

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preparation example Construction

[0032] The first aspect of the invention discloses a method of preparing a three-dimensional positive material, such as figure 1 The following steps are included in the following steps:

[0033] The three-membered precursor, the lithium source, and the metal dopant are mixed, and the organic solvent is used as a dispersion medium, mixed wet mill, dry, and obtain a mixture;

[0034] The mixed particles were obtained by using a fluorine-containing organic solvent ultrasonic infiltration of the mixture.

[0035] The mixed particles were highly sintered, pulverized grading, and the three-stage positive electrode material was prepared by warming up the mixed particles.

[0036] The preparation method mixes the three-membered precursor, the lithium source, and the metal dopant, and the organic solvent is used as the dispersion medium, and the mixed wet mill is mixed. After drying, the metal element is uniformly distributed in the surface of the mixture, and can be dried by distillation....

Embodiment 1

[0050] Take 50g Ni 0.5 CO 0.20 Mn 0.3 (OH) 2 20.86G LI 2 CO 3 And 0.0425g MGCL 2 In the ball milling apparatus, the ball mill ratio of 20: 1, the rotary speed 300r / min ball milling was obtained by 100 ml of anhydrous methanol and 100 ml absolute ethanol, and the ball mill was 300r / min.

[0051] The ball grinding was dried at 120 ° C for 6 h, and the mixture was obtained;

[0052] The obtained mixture was mixed with 2.1270 g of a fluorine-containing organic solvent, and the supersonic frequency of 30 kHz is ultrasonically ultrasonic, wherein the fluorine-containing organic solvent is a mass solvent of mass than PVDF: NMAC = 1: 1;

[0053] The granulation of the ultrasonic infiltration was added to the granulator into a particle diameter of 10 mm, and the granulation pressure was 0.2 MPa;

[0054] The prepared particles were placed in the box furnace, warmed to 170 ° C at 1 ° C / min, and the temperature was warmed to 350 ° C at 3 ° C / min and the temperature was warmed by 5 ° ...

Embodiment 2

[0057] Take 50g Ni 0.6 CO 0.20 Mn 0.2 (OH) 2 , 23.60g LIOH Hi 2 O and 0.0425G MGCL 2 , 0.0434G ALCL 3 And 0.0312G ZrCl 4 In the joining the ball mill, 200 ml of diethyl ether as a ball mill, the spherium is 20: 1, the rotational speed 500r / min ball mill mill, obtaining a ball milling;

[0058] The ball grinding was dried at 120 ° C for 8 h and obtained a mixture;

[0059] The resulting mixture was mixed with 3.6858 g of a fluorine-containing organic solvent, and the ultrasonic frequency of 35 kHz is ultrasound for 2 h, wherein the fluorine-containing organic solvent is a mass solvent of mass than PVDF: DMF = 1: 1;

[0060] The material after ultrasonic infiltration was added to the granulator, granulated into a particle diameter of 5 mm, and the granulation pressure was 0.4 MPa;

[0061] The prepared particles were placed in the box furnace, warmed to 160 ° C at 3 ° C / min, and the temperature was warmed to 10 ° C at 1 ° C / min and the temperature was warmed by 3 ° C / min. Th...

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Abstract

The invention discloses a ternary positive electrode material and a preparation method and application thereof. The preparation method comprises the following steps: mixing a ternary precursor, a lithium source and a metal dopant, and taking an organic solvent as a dispersion medium, and performing mixing, wet grinding and drying to obtain a mixture; ultrasonically infiltrating the mixture by using a fluorine-containing organic solvent, and performing granulating and tabletting to obtain mixed particles; and carrying out high-temperature sintering, crushing and grading on the mixed particles by adopting three-section programmed heating to prepare the ternary positive electrode material. By changing the mixing mode of the metal dopant and the precursor, ultrasonically infiltrating the fluorine-containing organic solvent and matching with the three-section programmed heating,the obtained ternary positive electrode material is uniformly doped with metal elements, the doping effect is good, the content of residual alkali on the surface of the material is effectively reduced, and the ternary positive electrode material has excellent electrochemical performance.

Description

Technical field [0001] The present invention belongs to the technical field of lithium ion battery, and more particularly to a method of preparing a three-dimensional positive electrode material, and a three-dimensional positive material obtained by the preparation method, further involving the ternary positive electrode material as an active material material in a lithium ion battery. Applications. Background technique [0002] Lithium-ion battery nickel-cobal manganese (NCM) ternary material is a new type of high-performance positive electrode material having high capacity, high magnification performance. In the context of currently growing power battery energy density requirements, it is considered to be one of the most developed lithium-ion batteries. [0003] The traditional high-nickel ternary positive electrode material is prepared by mechanical high mixing high temperature solid phase method, and the three-dimensional positive material prepared by this method is usually a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/50H01M4/505H01M4/52H01M4/525H01M4/36H01M10/0525
CPCC01G53/50H01M4/502H01M4/505H01M4/523H01M4/525H01M4/364H01M10/0525H01M2004/028C01P2006/40Y02E60/10
Inventor 饶媛媛徐懋程成方琴凤
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY CO LTD CO LTD
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