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Preparation method of coated lithium ion battery ternary positive electrode material

A technology for lithium-ion batteries and positive electrode materials, which is applied in the field of preparation of ternary positive electrode materials for coated lithium-ion batteries, and can solve problems such as difficult control of process conditions, inability to scale production, and high cost

Inactive Publication Date: 2017-10-10
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the atomic deposition method has complex equipment, long process flow, high cost, and cannot be produced on a large scale; the process conditions (such as stoichiometric ratio, hydrolysis conditions, pH value, etc.) of chemical methods such as hydrolysis and sol-gel are difficult to control, requiring Harsh and costly, it is difficult to apply to large-scale industrial production

Method used

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  • Preparation method of coated lithium ion battery ternary positive electrode material
  • Preparation method of coated lithium ion battery ternary positive electrode material
  • Preparation method of coated lithium ion battery ternary positive electrode material

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preparation example Construction

[0041] The invention provides a method for preparing a coated lithium-ion battery ternary positive electrode material, which is characterized in that it comprises the following steps:

[0042] a) ultrasonically dispersing the nano-oxide in the dispersion medium to obtain a dispersion;

[0043] The nano-oxide is nano-silica or nano-zirconia;

[0044] The dispersion medium is isopropanol, ethanol or acetone;

[0045] b) combine the dispersion with the ternary cathode material LiNi x co y mn z o 2 to mix, to stir, to obtain a mixture;

[0046] Among them, 0.5≤x≤0.6, 0.1≤y≤0.2, 0.2≤z≤0.3, x+y+z=1;

[0047] c) drying and sintering the mixture to obtain a coated lithium-ion battery ternary positive electrode material.

[0048] The present invention adopts the physical coating method to prepare the nano-oxide-coated ternary positive electrode material, the preparation process is simple and easy, the cost is low, and it can be mass-produced on a large scale, which meets the ind...

Embodiment 1

[0065] 1.1 Preparation of ternary cathode materials for coated lithium-ion batteries:

[0066] Weigh 40mL of isopropanol, respectively take 0.01g, 0.02g and 0.04g of nano-silica for ultrasonic dispersion (power of 700W, dispersion time of 2h) in isopropanol to form dispersions B, C and D respectively. Weigh three parts of 2g ternary cathode material LiNi 0.5 co 0.2 mn 0.3 o 2 , add the above-mentioned dispersions B, C, D, and stir magnetically at 60°C and 500r / min for 6-7h; after stirring, dry the obtained material at 120°C for 12h; place the dried material in a horse-boiling furnace, Raise the temperature to 450°C at a rate of 2°C / min and hold it for 5 hours to obtain nano-silica-coated LiNi with coating amounts of 0.5wt%, 1.0wt%, and 2.0wt%, respectively. 0.5 co 0.2 mn 0.3 o 2 The cladding materials (respectively denoted as B, C, D).

[0067] 1.2 Set the control sample:

[0068] Carry out the preparation process according to the above 1.1, the difference is that nan...

Embodiment 2

[0081] 2.1 Preparation of ternary cathode materials for coated lithium-ion batteries:

[0082] Weigh 40mL of isopropanol, respectively take 0.01g, 0.02g and 0.04g of nano-sized zirconia for ultrasonic dispersion (power of 700W, dispersion time of 2h) in isopropanol to form dispersions E, F and G respectively. Weigh three parts of 2g ternary cathode material LiNi 0.6 co 0.2 mn 0.2 o 2 , add the above-mentioned dispersions E, F, G, and stir magnetically at 60°C and 500r / min for 6-7h; after stirring, dry the obtained material at 120°C for 12h; place the dried material in a horse-boiling furnace, Raise the temperature to 450°C at a rate of 2°C / min and hold it for 5 hours to obtain nano-zirconia-coated LiNi with coating amounts of 0.5wt%, 1.0wt%, and 2.0wt%, respectively. 0.6 co 0.2 mn 0.2 o 2 The cladding materials (denoted as E, F, G respectively).

[0083] 2.2 Set the control sample:

[0084] The preparation process was carried out according to the above-mentioned 2.1, ...

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Abstract

The invention provides a preparation method of a coated lithium ion battery ternary positive electrode material. The coated lithium ion battery ternary positive electrode material is obtained by dispersing a nanometer oxide in a dispersing medium with ultrasound, mixing with a ternary positive electrode LiNi<x>Co<y>Mn<z>O2 and performing stirring, drying and sintering. The nanometer oxide coated ternary positive electrode material prepared by employing a physical coating method is simple and practical in preparation process and low in cost, production on a large scale can be achieved, and the industrial demand of the lithium ion battery ternary positive electrode material is satisfied; and moreover, the coated material has favorable electrochemical performance such as cycle property, rate performance and capacity and favorable thermal stability, and the performance demand of a lithium ion battery can be satisfied.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of a coated lithium ion battery ternary positive electrode material. Background technique [0002] As a clean energy storage device, lithium-ion batteries are widely used in people's daily life, such as mobile phone batteries, vehicle power supplies, etc., and their performance has attracted more and more attention. Ternary layered material LiNi x co y mn z o 2 With a high theoretical capacity, it is currently the most widely used cathode material in lithium-ion batteries. With the rapid expansion of the power market, the market demand for ternary cathode materials in the lithium battery industry is also increasing rapidly. At present, the relatively mature application is LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 Material. However, with the gradual improvement of performance requirements such as energy density and specific capacity of lithium-ion ba...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/505H01M4/525H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/483H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 陶涛陈超梁波姚英邦鲁圣国
Owner GUANGDONG UNIV OF TECH
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