Cathode material and preparation method and application thereof

A positive electrode material, alumina technology, applied in the direction of positive electrode, battery electrode, active material electrode, etc., can solve the problems that affect the uniformity of active material distribution on the electrode sheet, low mechanical strength of nano hollow spheres, complex layered coating operation, etc. , to achieve the effect of improving electrochemical performance, facilitating infiltration and absorption, convenient operation and

Pending Publication Date: 2021-03-12
HUBEI JINQUAN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above methods can improve the performance of the battery to a certain extent, there are still the following problems: the layered coating operation is complicated and there are many control parameters, which affects the production efficiency; multiple cold pressing can easily cause the wavy edge of the pole piece to affect the performance of the battery, etc.
However, the mechanical strength of the nano-hollow spheres is low, and structural damage is likely to occur in the process of preparing high-density battery pole pieces, thereby affecting the distribution uniformity of active materials on the pole piece, which is not conducive to the improvement of battery performance.

Method used

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  • Cathode material and preparation method and application thereof

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Effect test

Embodiment 1

[0068] This embodiment provides a positive electrode material and a preparation method thereof, the preparation method comprising the following steps:

[0069] (1) preparing alumina, specifically comprising:

[0070] (a) mixing and stirring the template agent hexadecyltrimethylammonium bromide and the aluminum source solution with a mass ratio of 1:25 to obtain a precursor solution; the stirring speed is 550rpm, and the time is 3h; the aluminum The source solution is prepared by mixing elemental aluminum with a mass ratio of 1:7.5 and an acetic acid solution with a concentration of 3mol / L;

[0071] (b) hydrothermally treating the precursor solution obtained in step (a) at 150° C. for 3 h, filtering and washing to obtain a solid substance;

[0072] (c) drying and calcining the solid matter obtained in step (b) to obtain alumina; the drying temperature is 80°C for 9 hours; the roasting temperature is 800°C for 2 hours;

[0073] (2) Alumina-coated lithium iron phosphate, specif...

Embodiment 2

[0078] This embodiment provides a positive electrode material and a preparation method thereof, the preparation method comprising the following steps:

[0079] (1) preparing alumina, specifically comprising:

[0080] (a) mixing and stirring the template agent hexadecyltrimethylammonium bromide and the aluminum source solution with a mass ratio of 1:22.5 to obtain a precursor solution; the stirring speed is 325rpm, and the time is 4h; the aluminum The source solution is prepared by mixing elemental aluminum with a mass ratio of 1:6.25 and a citric acid solution with a concentration of 4mol / L;

[0081] (b) hydrothermally treating the precursor solution obtained in step (a) at 125° C. for 3.5 hours, and obtaining a solid substance after suction filtration and washing;

[0082] (c) drying and roasting the solid matter obtained in step (b) to obtain alumina; the drying temperature is 70°C for 10.5 hours; the roasting temperature is 775°C for 2.5 hours;

[0083] (2) Alumina-coated...

Embodiment 3

[0089] This embodiment provides a positive electrode material and a preparation method thereof, the preparation method comprising the following steps:

[0090] (1) preparing alumina, specifically comprising:

[0091] (a) mixing and stirring the template agent hexadecyltrimethylammonium bromide and the aluminum source solution with a mass ratio of 1:27.5 to obtain a precursor solution; the stirring speed is 775rpm, and the time is 2h; the aluminum The source solution is prepared by mixing elemental aluminum with a mass ratio of 1:8.75 and an acetic acid solution with a concentration of 2mol / L;

[0092] (b) hydrothermally treating the precursor solution obtained in step (a) at 175° C. for 2.5 hours, centrifuging and washing to obtain a solid substance;

[0093] (c) drying and roasting the solid matter obtained in step (b) to obtain alumina; the drying temperature is 90°C for 7.5 hours; the roasting temperature is 825°C for 1.5 hours;

[0094] (2) Alumina-coated lithium iron phos...

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Abstract

The invention provides a positive electrode material as well as a preparation method and application thereof, the preparation method comprises the following steps: (1) preparing aluminum oxide, and specifically comprises the following steps: (a) mixing a template agent and an aluminum source solution to obtain a precursor solution; (b) carrying out hydrothermal treatment on the precursor solutionobtained in the step (a), and carrying out solid-liquid separation to obtain a solid substance; (c) drying and roasting the solid substance obtained in the step (b) to obtain aluminum oxide; (2) coating lithium iron phosphate with aluminum oxide, specifically, (d) mixing lithium iron phosphate, a dispersing agent, a solvent and aluminum oxide obtained in the step (1), and carrying out solid-liquidseparation to obtain an intermediate substance; and (e) drying and roasting the intermediate substance obtained in the step (d) to obtain the positive electrode material. According to the positive electrode material provided by the invention, the adverse effect of a cold pressing process on the pole piece is reduced, the battery energy density is increased, and the battery performance is furtherimproved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a lithium iron phosphate positive electrode material, in particular to a positive electrode material and a preparation method and application thereof. Background technique [0002] With the emergence of the energy crisis, the application fields of lithium-ion batteries are becoming more and more extensive. In the lithium-ion battery system, the selection of cathode materials has a significant impact on the performance of lithium-ion batteries. Therefore, the development of new low-cost and high-performance cathode materials for lithium-ion batteries is of great significance to the development of lithium-ion batteries. Lithium iron phosphate with olivine structure is widely used as the cathode material of lithium-ion batteries because of its high theoretical capacity, wide source, low cost and good cycle performance. In order to further increase the energy density of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/624H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 阮祝华魏成卓苑丁丁吕正中谭立波
Owner HUBEI JINQUAN NEW MATERIALS CO LTD
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