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Method for preparing hierarchical structure positive pole material for lithium ion battery and application

A lithium-ion battery, hierarchical structure technology, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of not meeting the power supply requirements of advanced electronic equipment, unable to take advantage of LiCl modification, and unsatisfactory discharge performance. Weakening the effect of polarization phenomenon, regular micro-morphology and uniform size

Active Publication Date: 2019-10-25
GUIZHOU MEILING POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Patent CN201610741604.0 discloses the method of adding LiCl to the nickel-cobalt-aluminum co-precipitation precursor to co-calcine the NCA ternary cathode material, and the reversible specific capacity of the obtained NCA ternary cathode material is 148mAh / g, and the capacity retention rate is 85% , since LiCl was not added in the precursor stage but was added as a lithium salt to the formed NCA precursor and then calcined, the modification advantages of LiCl could not be exerted, and the final product was still LiNi x co y Al z o 2 (x+y+z=1), the Cl element is lost after high-temperature sintering, and the O element is not replaced, so the discharge performance is still not ideal
[0008] In short, there is no effective method in the prior art that can quickly prepare NCA-type cathode materials with good high-rate performance. It is difficult for existing NCA-type cathode materials to have three characteristics of high potential, high specific energy, and high-rate output. , does not meet the power supply requirements of modern advanced electronic equipment

Method used

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  • Method for preparing hierarchical structure positive pole material for lithium ion battery and application
  • Method for preparing hierarchical structure positive pole material for lithium ion battery and application
  • Method for preparing hierarchical structure positive pole material for lithium ion battery and application

Examples

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Effect test

Embodiment 1

[0043] A kind of hierarchical structure cathode material for lithium-ion batteries, the specific chemical formula is LiNi 0.8 co 0.19 Al 0.01 o 1.90 Cl 0.1 ; The microscopic appearance is at least microspheres composed of 10 single-layer nanosheet stacks, and the preparation method specifically includes the following steps:

[0044] ① Weighing: Weigh lithium nitrate, nickel nitrate, cobalt nitrate, aluminum nitrate and lithium chloride in total 100g according to the molecular formula and stoichiometric ratio;

[0045] ②Water mixing: add lithium nitrate, nickel nitrate, cobalt nitrate, and aluminum nitrate weighed in step ① into a blender with 1000g of distilled water, and stir evenly at a speed of 80r / min until a clear solution is obtained, which is an aqueous solution for use;

[0046] ③ Molten salt mixing: Put LiCl in a ceramic container and heat it to clear liquid A at 620°C; then pour the aqueous solution obtained in step ② into the ceramic container, and heat it in a ...

Embodiment 2

[0051] A kind of hierarchical structure cathode material for lithium-ion batteries, the specific chemical formula is LiNi 0.37 co 0.6 Al 0.03 o 1.95 Cl 0.05 ; The microscopic appearance is at least microspheres composed of 10 single-layer nanosheet stacks, and the preparation method specifically includes the following steps:

[0052] ① Weighing: Weigh lithium nitrate, nickel nitrate, cobalt nitrate, aluminum nitrate and lithium chloride in total 500g according to the molecular formula and stoichiometric ratio;

[0053] ②Water mixing: add lithium nitrate, nickel nitrate, cobalt nitrate, and aluminum nitrate weighed in step ① into a blender with 3500g of ultrapure water, and stir evenly at a speed of 180r / min until a clear solution is obtained, that is, an aqueous solution spare;

[0054] ③ Molten salt mixing: Put LiCl in a ceramic container and heat it to clear liquid A at 670°C; then pour the aqueous solution obtained in step ② into the ceramic container and heat it in a ...

Embodiment 3

[0059] A kind of hierarchical structure cathode material for lithium-ion batteries, the specific chemical formula is LiNi 0.35 co 0.6 Al 0.05 o 1.9 Cl 0.1 ; The microscopic appearance is at least microspheres composed of 10 single-layer nanosheet stacks, and the preparation method specifically includes the following steps:

[0060] ① Weighing: Weigh lithium nitrate, nickel nitrate hexahydrate, cobalt nitrate hexahydrate, aluminum nitrate nonahydrate and lithium chloride in total 500g according to the molecular formula and stoichiometric ratio.

[0061] ②Water mixing: Add lithium nitrate, nickel nitrate hexahydrate, cobalt nitrate, and aluminum nitrate weighed in step ① into a stirrer and add 1500g of distilled water, and stir evenly at 200r / min until a clear solution is obtained, that is, an aqueous solution for use ;

[0062] ③ Molten salt mixing: Put LiCl in a ceramic container and heat it to clear liquid A at 670°C; then pour the aqueous solution obtained in step ② int...

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Abstract

The invention belongs to the technical field of a lithium ion battery and particularly relates to a hierarchical structure positive pole material for the lithium ion battery and a method for preparingthe hierarchical structure positive pole material for the lithium ion battery. A chemical formula of the hierarchical structure positive pole material is specifically LiNixCoyAl1-x-yOzCl2-z, whereinthe x is not smaller than 0.1 and is not greater than 0.9, the y is not smaller than 0.1 and is not greater than 0.9, the z is not smaller than 1.5 and is not greater than 1.95, the hierarchical structure positive pole material is prepared through water mixing, molten salt mixing, sintering and pulverization, by replacing O elements in an original NCA material by adding Cl elements, an NCA-type positive pole different from a conventional NCA material is formed, and the hierarchical positive pole material has the regular uniform microscopic morphology and further has high potential, high specific energy and high magnification output.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a positive electrode material with a hierarchical structure for lithium ion batteries, a preparation method and an application thereof. Background technique [0002] Li-ion batteries are the latest generation of rechargeable batteries after NiMH batteries. Lithium-ion batteries have become a widely used battery system due to their advantages such as high lithium intercalation voltage, high specific energy, no memory effect, small self-discharge, and non-toxicity, and are generally recognized in high-energy portable electronic devices. The cathode material of lithium-ion batteries is one of the cores of lithium-ion batteries. During the charging of lithium-ion batteries, the positive electrode material provides a large amount of freely intercalated lithium ions, which is very important for improving the electrochemical performance of lithium-ion batterie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/525H01M4/485H01M4/624H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 郭灏唐月娇张红梅唐立成石斌陈铤
Owner GUIZHOU MEILING POWER SUPPLY CO LTD
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