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A kind of lithium-ion battery cathode material with one-dimensional structure and preparation method thereof

A lithium-ion battery, cathode material technology, applied in battery electrodes, positive electrodes, structural parts, etc., can solve the problems of transmission loss, poor rate performance, poor consistency, etc., achieve high specific capacity, excellent rate performance, reduce ions Effect of Diffusion Path

Active Publication Date: 2022-04-12
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The positive electrode materials synthesized by the above method are mainly spherical particles or irregular powders, which have poor consistency. The transmission of electrons between particles or irregular powders will cause a large loss, and the rate performance is not good. It is difficult to meet the requirements of current electric vehicles. Filling needs

Method used

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  • A kind of lithium-ion battery cathode material with one-dimensional structure and preparation method thereof
  • A kind of lithium-ion battery cathode material with one-dimensional structure and preparation method thereof
  • A kind of lithium-ion battery cathode material with one-dimensional structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The chemical formula of lithium-ion battery cathode material is LiNi 0.5 co 0.2 mn 0.3 o 2 , its preparation method comprises the following steps:

[0051] (1) Measure 3.63g of nickel sulfate, 1.31g of manganese sulfate, and 1.45g of cobalt sulfate, and add them to a mixture of 120mL of deionized water and 120mL of isopropanol in sequence according to the ratio of Ni:Co:Mn=5:2:3 Stir to dissolve to obtain a transparent and uniform solution a.

[0052] (2) Weigh 7.2 g of ethylenediaminetetraacetic acid and add it into the above solution a to obtain the mixed solution b.

[0053] (3) Extend the spoke rod of the ultrasonic cell pulverizer into the beaker (250mL) filled with the mixed liquid b, and set it 2cm below the liquid surface, set the ultrasonic power to 500W, and set the ultrasonic time to 20min. Take out the beaker, wash the powder sample in the beaker three times with deionized water and absolute ethanol, and dry it in a thermostat at 60°C for 24 hours to ob...

Embodiment 2

[0057] Example 2 (NCM622)

[0058] The chemical formula of lithium-ion battery cathode material is LiNi 0.6 co 0.2 mn 0.2 o 2 , its preparation method comprises the following steps:

[0059] (1) Measure 4.18g of nickel sulfate, 0.84g of manganese sulfate, and 1.37g of cobalt sulfate, and add them to a mixture of 40mL of deionized water and 200mL of isopropanol in sequence according to the ratio of Ni:Co:Mn=6:2:2 Stir to dissolve to obtain a transparent and uniform solution a.

[0060] (2) Weigh 7.2 g of ethylenediaminetetraacetic acid and add it into the above solution a to obtain the mixed solution b.

[0061] (3) Insert the spoke rod of the ultrasonic cell pulverizer into the beaker (250mL) filled with the mixed solution b, and set it 2cm below the liquid surface, set the ultrasonic power to 500W, and set the ultrasonic time to 20min. Take out the beaker, wash the powder sample in the beaker three times with deionized water and absolute ethanol, and dry it in a thermos...

Embodiment 3

[0064] Example 3 (NCM811)

[0065] The chemical formula of lithium-ion battery cathode material is LiNi 0.8 co 0.1 mn 0.1 o 2 , its preparation method comprises the following steps:

[0066] (1) Measure 5.34g of nickel sulfate, 0.67g of manganese sulfate, and 1.37g of cobalt sulfate, and add them to a mixture of 200mL of deionized water and 40mL of isopropanol in sequence according to the ratio of Ni:Co:Mn=8:1:1 Stir to dissolve to obtain a transparent and uniform solution a.

[0067] (2) Weigh 7.2 g of ethylenediaminetetraacetic acid and add it into the above solution a to obtain the mixed solution b.

[0068] (3) Put the spoke rod of the ultrasonic cell pulverizer into the beaker (250 mL) filled with the mixed liquid b, and set it 2 cm below the liquid surface, set the ultrasonic power to 500 watts, and set the ultrasonic time to 20 minutes. Take out the beaker, wash the powder sample in the beaker three times with deionized water and absolute ethanol, and dry it in an...

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Abstract

The invention relates to a lithium ion battery cathode material with a one-dimensional structure and a preparation method thereof. The reaction liquid is placed in an ultrasonic sound field, and under the action of ultrasonic cavitation, the alcohol and ethylenediaminetetraacetic acid cooperate with the metal salt to achieve a sonochemical reaction to obtain a positive electrode material precursor with a one-dimensional structure. The method of the invention is simple, the time is short, it only needs to be carried out in the atmospheric environment, and the cost is low. Mix the precursor and lithium salt evenly and then calcine and lithiate to obtain a positive electrode material with a one-dimensional structure. The general chemical formula of the positive electrode material is Li 1+ t Ni x co y m z o 2 , wherein, 0≤t≤0.6, 0≤x≤1, 0≤y≤1, 0≤z≤1, x+y+z=1, and M is one of Mn or Al. The positive electrode material with a one-dimensional structure obtained by the present invention has excellent electron transport in the longitudinal direction, and reduces lithium ion diffusion paths in the radial direction, thereby obtaining high rate performance, specific capacity and cycle stability.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery electrode material preparation, and in particular relates to a lithium ion battery positive electrode material with a one-dimensional structure and a preparation method thereof. Background technique [0002] Lithium-ion batteries are currently widely used secondary batteries. They have the advantages of high working voltage, high energy density, long cycle life, and no memory effect. They are widely used in portable electronic products, electric vehicles, and renewable energy storage. Cathode materials are an important part of lithium-ion batteries, accounting for most of the battery cost. Ideal cathode materials should have the characteristics of high capacity, high output voltage, excellent rate performance, stable cycle and low cost. [0003] Lithium cobalt oxide (LiCoO 2 ), lithium manganate (LiMnO 2 ), lithium nickelate (LiNiO 2 ), nickel-cobalt lithium manganate ternary materi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/44C01G53/42H01M4/505H01M4/525H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 刘勇赖永健
Owner SUN YAT SEN UNIV