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Multicomponent material with multilayer coating structure for lithium ion battery and preparation method thereof

A lithium-ion battery, multi-layer coating technology, applied in the direction of electrode manufacturing, electrical components, secondary batteries, etc., can solve the problems of battery expansion, high temperature safety, low safety performance, nickel material reduction, etc., to achieve high temperature cycle stability, High safety and low battery swelling effect

Inactive Publication Date: 2011-03-30
BEIJING EASPRING MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, Li 2 CO 3 Lithium salts such as LiOH or LiOH remain between the particles as reaction residues, and LiOH absorbs CO in the air 2 also converts to Li 2 CO 3 , when charging Li 2 CO 3 Decomposes or reacts with electrolytes to produce CO 2 gas, which may lead to the occurrence of battery swelling and deterioration of high-temperature safety
[0007] Patent application CN1778003 proposes that the composition formula is Li y (Ni x co 1-2x mn x )O 2 , where 0.025≤x≤0.5, the nickel content is low, the cycle performance is better, the safety performance is improved, but the specific capacity is low; the patent application CN101300696 proposes a composition formula of Li x (Ni 1-a-b (Ni 1 / 2 mn 1 / 2 ) a co b A k ) y o 2 , 0.4 ≤ Ni ≤ 0.7, 0.1 ≤ Co ≤ 0.4, 0.05 ≤ Mn ≤ 0.6 high nickel content materials, their specific capacity has increased, but the cycle performance and safety performance of nickel materials have decreased

Method used

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  • Multicomponent material with multilayer coating structure for lithium ion battery and preparation method thereof
  • Multicomponent material with multilayer coating structure for lithium ion battery and preparation method thereof
  • Multicomponent material with multilayer coating structure for lithium ion battery and preparation method thereof

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Effect test

Embodiment 1

[0040] A kind of multi-component material with multi-layer coating structure for lithium ion battery, such as figure 1 As shown, it is a core-shell structure, including the core and cladding layer, and the metal oxide containing lithium in the core is LiNiO 2 , the metal oxide containing lithium in the cladding layer is LiNi 0.38 co 0.35 mn 0.27 o 2 , the number of cladding layers n is 1.

[0041] The ratio of cladding thickness to core radius is 1:4.

[0042] The median diameter of the particles composed of the inner core and the cladding layer is 15 μm, and the tap density is 2.5 g / cm 3 .

[0043] The preparation method is as follows:

[0044] Prepare 1mol / L nickel sulfate solution, 2.5mol / L complexing agent ammonia solution, and 5mol / L precipitant sodium hydroxide solution. The three solutions were simultaneously added to the stirred reaction vessel concurrently, the liquid addition rate was controlled so that the pH value of the solution in the reaction system was ...

Embodiment 2

[0047] A kind of multi-component material with multi-layer coating structure for lithium ion battery, such as figure 2 As shown, including the core and cladding layer, the metal oxide containing lithium in the core is LiNi 0.8 co 0.1 mn 0.08 Mg 0.02 o 2 , the material of the cladding layer includes lithium-containing metal oxide, and the number of cladding layers is n=2.

[0048] The ratio of the total thickness of the cladding layer to the radius of the core is 1:1.

[0049] The median diameter of the inner core and cladding layer is about 13μm, and the tap density is 2.3g / cm 3 .

[0050] The lithium-containing metal oxide in the first layer material of the cladding layer is LiNi 0.53 co 0.13 mn 0.32 Al 0.01 Zn 0.01 o 2 , the metal oxide containing lithium in the second layer material of the cladding layer is LiNi 0.23 co 0.42 mn 0.32 Ca 0.03 o 2 .

[0051] The preparation method is as follows:

[0052]Dissolve nickel chloride, cobalt chloride, manganese c...

Embodiment 3

[0057] A multi-component material with a multi-layer cladding structure for a lithium-ion battery, including an inner core and a cladding layer, and the lithium-containing metal oxide in the inner core is LiNi 0.4 co 0.48 mn 0.12 o 2 , the material of the cladding layer includes lithium-containing metal oxide, and the number n of cladding layers is 2.

[0058] The ratio of the thickness of the cladding layer to the radius of the core is 1:10.

[0059] The median diameter of the inner core and cladding layer is about 10 μm, and the tap density is 2.2 g / cm 3 .

[0060] The metal oxide containing lithium in the material of the first layer of the cladding layer is LiNi 0.2 co 0.5 mn 0.28 Mg 0.02 o 2 , the metal oxide containing lithium in the second layer material of the cladding layer is LiCo 0.56 mn 0.42 Sr 0.02 o 2 .

[0061] The preparation method is as follows:

[0062] Dissolve nickel nitrate, cobalt nitrate, and manganese chloride according to the metal molar...

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Abstract

The invention discloses a multicomponent material for a lithium ion battery and a preparation method thereof, and particularly relates to a multicomponent material with a multilayer coating structure for a lithium ion battery and a preparation method thereof. The multicomponent material with the multilayer coating structure comprises an inner core and coating layers, wherein both the inner core and the coating layers comprise lithium-containing metallic oxides; and the number n of the coating layers is 1 to 5. The multicomponent material with the multilayer coating structure has a simple preparation process, relatively low cost and high processability; and the lithium ion battery made of the material has a small amount of swelling, high capacity, high high-temperature cyclical stability and high safety.

Description

technical field [0001] The present invention relates to a multi-element material for a lithium ion battery and a preparation method thereof, in particular to a multi-element material with a multi-layer coating structure for a lithium ion battery and a preparation method thereof; Background technique [0002] Lithium-ion batteries are more and more widely used in modern society, and are currently mainly used in mobile phones, notebook computers, power tools and electric vehicles. With the increase in the amount of lithium-ion batteries and the demand for large-capacity lithium-ion batteries for electric vehicles, it is urgent to develop lithium-ion batteries with high safety, high energy density, high power, long cycle life, high environmental protection and low cost. Cathode materials are the key materials that determine the performance and price of lithium-ion batteries. LiCoO is currently the most researched and applied cathode material. 2 , LiNiO 2 、LiNi x co 1-x o 2...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/50H01M4/52C01G53/00H01M4/04H01M10/36H01M10/40
CPCY02E60/10
Inventor 白厚善刘亚飞陈彦彬沙金王汝娜宋顺林
Owner BEIJING EASPRING MATERIAL TECH CO LTD
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