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Preparation method of lanthanum zirconate in-situ coated high-nickel ternary cathode material

A positive electrode material and in-situ coating technology, which is applied in the field of modified preparation of lithium-ion battery positive electrode materials, can solve the problems of consuming lithium residues, reducing surface alkalinity, and not effectively avoiding irreversible capacity loss, etc., achieving simple preparation process, The effect of low cost, good cycle stability and rate performance

Active Publication Date: 2019-03-12
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] CN105489929A ​​discloses a Li 7 La 3 Zr 2 o 12 A preparation method for coating lithium-ion battery materials, but this method cannot consume lithium residues well and reduce surface alkalinity, so it cannot effectively avoid irreversible capacity loss

Method used

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  • Preparation method of lanthanum zirconate in-situ coated high-nickel ternary cathode material
  • Preparation method of lanthanum zirconate in-situ coated high-nickel ternary cathode material
  • Preparation method of lanthanum zirconate in-situ coated high-nickel ternary cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Lanthanum zirconate prepared in this example coated LiNi in situ 0.8 co 0.1 mn 0.1 o 2 High-nickel ternary positive electrode material, the mass percentage content of the lanthanum zirconate is 1%, and the lanthanum zirconate is in the high-nickel ternary positive electrode material LiNi 0.8 co 0.1 mn 0.1 o 2 The in-situ gradient growth on the surface forms an amorphous coating layer; the positive electrode material is a spherical particle with a particle diameter of 10-12 μm.

[0046] This embodiment includes the following steps:

[0047] (1) Weigh 10.0000g LiNi 0.8 co 0.1 mn 0.1 o 2 Add the powder into absolute ethanol, then add 0.1513g of lanthanum nitrate (hexahydrate) and stir at a stirring rate of 80 rpm for 30min to obtain a black suspension a;

[0048] (2) Disperse 0.1574g of tetrabutyl zirconate (85% by mass) in 40mL of absolute ethanol, and stir at a stirring rate of 80 rpm for 30min until a transparent and uniform solution b is formed;

[0049] (3...

Embodiment 2

[0060] Lanthanum zirconate prepared in this example coated LiNi in situ 0.8 co 0.1 mn 0.1 o 2 High-nickel ternary positive electrode material, the mass percent content of the lanthanum zirconate is 3%, lanthanum zirconate in the high-nickel ternary positive electrode material LiNi 0.8 co 0.1 mn 0.1 o 2 The in-situ gradient growth on the surface forms an amorphous coating layer; the positive electrode material is a spherical particle with a particle diameter of 10-12 μm.

[0061] This embodiment includes the following steps:

[0062] (1) Weigh 10.0000g LiNi 0.8 co 0.1 mn 0.1 o 2 Add the powder into absolute ethanol, add 0.4539g of lanthanum nitrate (hexahydrate) and stir at a stirring rate of 900 rpm for 10min to obtain a black suspension a;

[0063] (2) Add 0.4722g of tetrabutyl zirconate (85% by mass) into 80mL of absolute ethanol, and stir at a stirring rate of 900 rpm for 10min until a transparent and uniform solution b is formed;

[0064] (3) Add suspension a t...

Embodiment 3

[0072] Lanthanum zirconate prepared in this example coated LiNi in situ 0.8 co 0.1 mn 0.1 o 2 High-nickel ternary positive electrode material, the mass percent content of the lanthanum zirconate is 10%, and the lanthanum zirconate is contained in the high-nickel ternary positive electrode material LiNi 0.8 co 0.1 mn 0.1 o 2 The in-situ gradient growth on the surface forms an amorphous coating layer; the positive electrode material is a spherical particle with a particle diameter of 10-12 μm.

[0073] This embodiment includes the following steps:

[0074] (1) Weigh 10.0000 g LiNi 0.8 co 0.1 mn 0.1 o 2 Add the powder into anhydrous methanol, then add 1.513g of lanthanum nitrate (hexahydrate) and stir at a stirring rate of 300 rpm for 20min to obtain a black suspension a;

[0075](2) Add 1.5742g of tetrabutyl zirconate (85% by mass) into 40mL of absolute ethanol, and stir at a stirring rate of 300 rpm for 20min until a transparent and uniform solution b is formed;

[...

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Abstract

The invention relates to a preparation method of a lanthanum zirconate in-situ coated high-nickel ternary cathode material. The preparation method comprises the steps of: adding the high-nickel ternary cathode material into an anhydrous organic solvent, and then, adding a lanthanum source and stirring, so that black suspension a is obtained; adding a zirconium source into the anhydrous organic solvent and stirring, so that solution b is obtained, wherein the mole rate of zirconium in the zirconium source to lanthanum in the lanthanum source is 1:1; adding the suspension a into the solution b and stirring, then, performing ultrasonic processing, and then, ageing, so that gel is obtained; drying the obtained gel by distillation, so that dried gel powder is obtained; and roasting after grinding the dried gel powder, so that the material is obtained. By utilization of a battery assembled by the material obtained in the invention, under 2.7-4.3 V and 0.1 C, the initial discharge specific capacity can be up to 209.8 mAh / g; after 50 laps of cycle under 1C, the capacity retention ratio can be up to 94.8%; the cycle stability and the rate performance are better; and the method in the invention is simple and low in cost, and is applied to industrial production.

Description

technical field [0001] The invention relates to the modification and preparation of positive electrode materials for lithium ion batteries, in particular to a preparation method for in-situ coating of high-nickel ternary positive electrode materials by lanthanum zirconate. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high power density, low self-discharge rate, no memory effect, and long cycle life. They have been widely used in mobile devices, power batteries, and energy storage systems. However, at present, lithium-ion batteries for power vehicles still face problems such as short cruising range, poor cycle performance and insufficient safety, which seriously restrict their further development. [0003] High-nickel ternary cathode material is one of the most concerned materials in lithium-ion battery research at present. Its theoretical discharge specific capacity is as high as 278mAh / g, and its voltage platform is 3.6V. I...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/505H01M4/525H01M4/62
CPCH01M4/364H01M4/38H01M4/505H01M4/525H01M4/62Y02E60/10
Inventor 郑俊超刘洋范鑫铭贺振江杨书棋汤林波
Owner CENT SOUTH UNIV
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