Lithium manganese oxide material and preparation method thereof

A lithium manganate and coating technology, which is applied in the field of high crystallinity lithium manganate material and its preparation, can solve the problems that the coating elements cannot form a concentration gradient, the coating is unevenly dispersed, and the coating effect cannot be achieved. , to achieve the effects of improving high temperature and normal temperature cycle performance and high temperature storage performance, excellent high temperature storage performance, good room temperature and high temperature cycle performance

Inactive Publication Date: 2011-05-11
BEIJING EASPRING MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the patent application CN101038965A, at least one of a layer of boron-lithium composite oxide, cobalt-lithium composite oxide, vanadium-lithium composite oxide or carbon layer is coated on the basis of doped lithium manganate, so that the normal temperature of the lithium manganate material The cycle and high temperature cycle have been improved to a certain extent; however, due to the loose and porous lithium manganate material itself, large specific surface area, and rough surface, when the coating method is used, the coating may be doped into the crystal grains, which will lead to coating The dispersion of the substance is not uniform or the concentration gradient of the coating element cannot be formed, so the desired coating effect cannot be achieved.

Method used

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  • Lithium manganese oxide material and preparation method thereof
  • Lithium manganese oxide material and preparation method thereof
  • Lithium manganese oxide material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A lithium manganate material is a lithium manganate modified material coated on a lithium manganate precursor with a primary crystal particle size of 0.5 μm to 20 μm. The lithium manganate material is Li 1.20 mn 1.90 Mg 0.025 B 0.025 Al 0.05 o 3.95 f 0.05 , the doping element is Mg, B, F, and the coating element is Al.

[0047] A preparation method of lithium manganate material, comprising the steps of:

[0048] (1) Weigh a certain amount of lithium carbonate, electrolytic manganese dioxide, magnesium oxide, boric acid and lithium fluoride according to the molar ratio of Li:Mn:Mg:B:F: 1.20:1.90:0.025:0.025:0.05 Mix in a material tank, sinter the uniformly mixed material at 850°C, cool naturally to room temperature, crush, and sieve to obtain a high-crystallinity lithium manganate precursor with a primary crystal particle size of 0.5-20 μm;

[0049] (2) Combine the precursor in step (1) with Al 2 o 3 Mixed in the mixing tank, where, Al 2 o 3 The molar ratio w...

Embodiment 2

[0054] A lithium manganate material, including a precursor and a coating, the precursor is a doped lithium manganate with a primary crystal particle size of 0.5 μm to 20 μm. The lithium manganate material is Li 0.95 mn 1.80 Mg 0.05 B 0.05 Al 0.025 Li 0.05 Mg 0.025 o 3.90 S 0.05 f 0.05 , the doping elements are Mg, B, S, and the coating elements are Al, Li, Mg, and F.

[0055] A preparation method of lithium manganate material, comprising the steps of:

[0056] (1) Weigh a certain amount of lithium hydroxide, manganese carbonate, magnesium oxide, boric acid, and ammonium sulfide according to the molar ratio of Li:Mn:Mg:B:S: 0.95:1.80:0.05:0.05:0.05, and place them in the mixing tank Mix in medium, sinter the uniformly mixed material at 750°C, cool naturally to room temperature, crush, and sieve to obtain a high-crystallinity lithium manganate precursor with a crystal particle size of 0.5-20 μm or more;

[0057] (2) Make the precursor in step (1) into a suspension, ad...

Embodiment 3

[0061] A lithium manganate material, including a precursor and a coating, the precursor is a doped lithium manganate with a primary crystal particle size of 0.5-20 μm. The lithium manganate material is Li 0.90 mn 1.80 co 0.02 Cr 0.02 B 0.02 V 0.02 Zn 0.02 Cr 0.025 co 0.025 Ni 0.025 Mg 0.025 o 3.80 f 0.05 Cl 0.05 Br 0.05 I 0.05 , the doping elements are Co, Cr, B, V, Zn, F, Cl, and the coating elements are Cr, Co, Ni, Mg, Br, and I.

[0062] A preparation method of lithium manganate material, comprising the steps of:

[0063] (1) Weigh a certain amount of lithium source, oxide Manganese, cobalt oxide, chromium oxide, boric acid, vanadium pentoxide, zinc oxide, lithium fluoride, zinc chloride, wherein the lithium source is a mixture of lithium bicarbonate, lithium oxide, lithium nitrate and lithium sulfate, placed in the mixing Mix in a tank, sinter the uniformly mixed material at 950°C, cool naturally to room temperature, crush, and sieve to obtain a high-cryst...

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PUM

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Abstract

The invention discloses a lithium manganese oxide material and a preparation method thereof, in particular to a high-crystallinity lithium manganese oxide material and a preparation method thereof, wherein the high-crystallinity lithium manganese oxide material is used for coating a lithium ion battery. The lithium manganese oxide material is obtained by being coated on a lithium manganese oxide precursor with the one-time crystal particle of 0.01-20mum and has the general formula of LiaMn2-b-cMbGcO4-d-eXdZe, wherein M and X are doped elements, G and Z are coating elements of which the concentration is distributed in a decreasing gradient from outside to inside, a is not less than 0.9 and is not more than 1.2, b is not less than 0 and is not more than 0.2, c is more than 0 and is not more than 0.2, d is not less than 0 and is not more than 0.2, and e is not less than 0 and is not more than 0.2. The material serves as the positive pole material of the lithium ion battery, has better normal-temperature and high-temperature cycle performance and excellent high-temperature storage performance, is simple in preparation and easy to operate, control and carry out industrial production.

Description

technical field [0001] The invention relates to a lithium manganate material and a preparation method thereof, in particular to a high-crystallinity lithium manganate material applied to the coating of a lithium ion battery and a preparation method thereof. Background technique [0002] As an emerging power source, lithium-ion batteries have many advantages such as high voltage, high capacity, light weight, small size, safety and environmental protection, so they are widely used in mobile phones, notebook computers, digital products and other fields. Lithium cobaltate material has become the most common lithium ion cathode material on the market due to its simple preparation method and good material stability, but cobalt resources are scarce and the material is expensive, and cobalt has important applications in the electronic field and military, which is strategic resources, so its large-scale application is subject to certain restrictions. [0003] Spinel lithium manganes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/1391H01M4/13915
CPCY02E60/10
Inventor 白厚善陈彦彬韩坤明张杰杨克迪
Owner BEIJING EASPRING MATERIAL TECH CO LTD
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