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Ternary composite with core-shell structure and preparation method therefor

A composite material, core-shell structure technology, applied in structural parts, electrical components, electrochemical generators, etc., can solve problems such as poor rate performance and poor safety performance

Inactive Publication Date: 2017-08-18
江苏元景锂粉工业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the problems of poor rate performance and poor safety performance of the current ternary materials, the purpose of the present invention is to improve the rate performance of the material by coating a layer of lithium zirconate composite material and its polymer on the surface of the ternary material , safety performance

Method used

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  • Ternary composite with core-shell structure and preparation method therefor
  • Ternary composite with core-shell structure and preparation method therefor
  • Ternary composite with core-shell structure and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1) Weigh 10g of lithium zirconate, 0.4g of polyvinylidene fluoride, and 3g of activated carbon and add it to 1500mL of N-methylpyrrolidone, and then disperse at a high speed to obtain a lithium zirconate / activated carbon composite solution (referred to as solution A);

[0018] 2) Then weigh 150gLiNi 0.6 co 0.2 mn 0.2 o 2 Add the ternary material to solution A, stir evenly, filter, wash, and vacuum dry at 80°C to obtain the ternary material / lithium zirconate composite material B;

[0019] 3) After that, 25 grams of polypropylene carbonate material was dissolved in 250 grams of ethyl methyl carbonate (EMC) to form a polymer solution. After stirring at a low speed for 30 minutes, a polymer solution was obtained, and then 30 grams of composite material B was weighed and added to After being uniformly stirred in the polymer solution, it is dried and pulverized to obtain a ternary composite material whose outer layer is coated with a polymer.

Embodiment 2

[0021] 1) Weigh 10g of lithium zirconate, 0.2g of polyvinylidene fluoride, and 2g of activated carbon into 1000mL of N-methylpyrrolidone, and then disperse at high speed to obtain a lithium zirconate / activated carbon composite solution (referred to as solution A);

[0022] 2) Then weigh 100gLiNi 0 . 8 co 0.1 mn 0.1 o 2 Add the ternary material to solution A, stir evenly, filter, wash, and vacuum dry at 80°C to obtain the ternary material / lithium zirconate composite material B;

[0023] 3) Dissolve 20 grams of polymethylsiloxane material in 200 grams of ethyl methyl carbonate (EMC) to form a polymer solution, stir at a low speed for 10 minutes to obtain a polymer solution, and then weigh 10 grams of composite material B to add into the polymer solution, stirred evenly, dried and pulverized to obtain a ternary composite material coated with a polymer on the outer layer.

Embodiment 3

[0025] 1) Weigh 10g of lithium zirconate, 0.5g of polyvinylidene fluoride, and 4g of activated carbon into 2000mL of N-methylpyrrolidone, and then disperse at high speed to obtain a lithium zirconate / activated carbon composite solution (referred to as solution A);

[0026] 2) Then weigh 200gLiNi 0.5 co 0.2 al 0.3 o 2 Add the ternary material to solution A, stir evenly, filter, wash, and vacuum dry at 80°C to obtain the ternary material / lithium zirconate composite material B;

[0027] 3) After that, dissolve 30 grams of polymethyl acrylate material in 300 grams of ethyl methyl carbonate (EMC) to form a polymer solution. After stirring at a low speed for 60 minutes, a polymer solution is obtained, and then weigh 50 grams of composite material B and add it to the polymerization After being stirred uniformly, it is dried and pulverized to obtain a ternary composite material whose outer layer is coated with a polymer.

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Abstract

The invention belongs to the field of preparation of lithium ion battery materials, and particularly to a ternary composite with a core-shell structure and preparation method therefor. The composite has the core-shell structure; an inner core is a ternary material; an intermediate layer is a lithium zirconate and activated carbon composite; and an outer layer is a macromolecule polymer material. An experimental process comprises the following steps of firstly preparing a lithium zirconate and activated carbon mixed liquid; then adding the ternary material to obtain a precursor of the ternary material with the core-shell structure; and then adding into a polymer solution for coating the outer layer with the polymer and preparing the ternary composite. The prepared ternary material, depending on a characteristic of the conductivity of lithium ions in the lithium zirconate, improves the conduction velocity of a lithium ion battery; meanwhile, due to the utilization of a large specific surface area of activated carbon, the liquid-absorption ability and the liquid-retention ability of the material as well as the electric double layer effect of the material can be improved; the property of high-rate discharge of the battery can be improved; and the lithium ion battery that applies the prepared material has the characteristics of high safety performance, excellent rate performance, and the like.

Description

technical field [0001] The invention belongs to the field of preparation of lithium ion battery materials, in particular to a ternary composite material with a core-shell structure and a preparation method thereof. Background technique [0002] Ternary materials are the key cathode materials for lithium-ion batteries, and their performance has an important impact on the energy density and safety performance of lithium-ion batteries. The ternary materials (NCM or NCA) currently used in the market, in order to improve their conductivity and compatibility with the electrolyte, most of the surface-coated materials are carbon materials. For example, the patent (CN103227314 A) discloses a three-component The preparation method of the element cathode material is mainly by dissolving lithium salt, nickel salt, manganese salt and cobalt salt in alcohol compound solvent according to a certain molar ratio, then stirring and continuously feeding air or oxygen, adding concentrated ammoni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/62H01M4/624H01M10/0525Y02E60/10
Inventor 黄国林王建琴
Owner 江苏元景锂粉工业有限公司
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