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Ternary cathode material of lithium ion battery and preparation method thereof

A lithium-ion battery and cathode material technology, applied in the field of electrochemistry, can solve the problems of little power density improvement of battery materials, high cost, complex process, etc., and achieve excellent physical and electrochemical properties, improved compaction density, pollution, etc. low effect

Inactive Publication Date: 2020-06-26
SHANGHAI APPLIED TECHNOLOGIES COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these surface modification methods are complicated in process and high in cost. At the same time, adding one or more elements will bring more problems to the recovery of lithium-ion batteries in the future. Density boost helps little

Method used

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  • Ternary cathode material of lithium ion battery and preparation method thereof
  • Ternary cathode material of lithium ion battery and preparation method thereof
  • Ternary cathode material of lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A preparation method of a pressure-treated lithium-ion ternary positive electrode battery material, comprising the following steps:

[0030] S1. Weigh lithium carbonate, nickel oxide, cobalt tetroxide, and manganese dioxide according to the molar ratio of lithium, nickel, cobalt, and manganese elements in a ratio of 10.5:5:2:3, and add them in a proportion of 10% by mass of solid and solvent deionized water, and stir to combine. After ball milling at a rate of 1500 rpm for 0.5 h by a ball mill, spray drying with a spray dryer to obtain a precursor powder mixture;

[0031] S2. The powder mixture obtained in the S1 step is pressed using a pressure of 2 MPa to obtain a cake-shaped solid with a diameter of 2 cm and a height of 0.4 cm;

[0032] S3. Grind and sieve the massive solid obtained in step S2, the mesh number of the sieve is 100 mesh, heat up at a heating rate of 5°C / min in an air atmosphere, keep the temperature at 800°C for 10 hours, and cool at a rate of 5°C / m...

Embodiment 2

[0035] A preparation method of a pressure-treated lithium-ion ternary positive electrode battery material, comprising the following steps:

[0036] S1. Weigh lithium carbonate, nickel oxide, cobalt tetroxide, and manganese dioxide according to the molar ratio of lithium, nickel, cobalt, and manganese elements at 10.5:6:2:2, and add them in proportions of 40% by mass of solids and solvents deionized water, and stir to combine. Ball milling with a ball mill at a rate of 2000 rpm for 1 hour, and then spray drying with a spray dryer to obtain a precursor powder mixture;

[0037] S2. The powder mixture obtained in the S1 step is pressed using a pressure of 3 MPa to obtain a cake-shaped solid with a diameter of 2 cm and a height of 0.5 cm;

[0038] S3. Grind and sieve the massive solid obtained in the S2 step, the mesh number of the sieve is 250 mesh, in a high-purity oxygen atmosphere with a gas flow rate of 400mL / min, the temperature is raised at a heating rate of 5°C / min, at 550...

Embodiment 3

[0042] A preparation method of a pressure-treated lithium-ion ternary positive electrode battery material, comprising the following steps:

[0043] S1. Weigh lithium carbonate, nickel oxide, cobalt tetroxide, and manganese dioxide according to the molar ratio of lithium, nickel, cobalt, and manganese elements at a molar ratio of 10.5:8:1:1, and add them in a proportion of 40% by mass of solid and solvent deionized water, and stir to combine. After ball milling by a ball mill at a rate of 2500 rpm for 1 hour, spray drying is carried out by a spray dryer to obtain a precursor powder mixture;

[0044] S2. The powder mixture obtained in the S1 step is pressed using a pressure of 50 MPa to obtain a block solid with a diameter of 2 cm and a height of 0.4 cm;

[0045]S3. Grind and sieve the massive solid obtained in the S2 step, the mesh number of the sieve is 500 mesh, in a high-purity oxygen atmosphere with a gas flow rate of 400mL / min, the temperature is raised at a heating rate ...

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Abstract

The invention discloses a ternary positive electrode material of a lithium ion battery and a preparation method of the ternary positive electrode material. According to the ternary cathode material ofthe lithium ion battery, high-nickel lithium nickel cobalt oxide is used as a modified matrix, and precursor powder is pressed by external mechanical pressure for modification. The preparation methodcomprises the following steps: stirring and mixing indissolvable inorganic salts of nickel, cobalt and manganese elements and lithium salt in deionized water, and preparing precursor powder through ball milling and spray drying; pressing the precursor powder into a cake-shaped solid under the action of external mechanical pressure; grinding and sieving the cake-shaped solid, and performing heating and calcining to obtain powder, namely the ternary material of the lithium ion battery. According to the invention, the precursor of the high-nickel lithium nickel cobalt manganate material is pressed by external mechanical pressure; compared with the prior art, the method has the advantages of simple operation, low cost, and facilitation of realization of commercial production of the high-nickel lithium cobalt manganate ternary material by enterprises, and the tap density of the high-nickel lithium cobalt manganate ternary material is improved, and uniform active particles are obtained, sothe high-nickel lithium cobalt manganate ternary material has high specific capacity and good cycle performances under a large multiplying power.

Description

technical field [0001] The invention relates to a lithium ion battery cathode material and a preparation method thereof, belonging to the technical field of electrochemistry. Background technique [0002] Nowadays, electric vehicles and hybrid vehicles powered by lithium-ion batteries are gradually commercialized and have entered daily life. However, compared with traditional fuel-powered vehicles, electric vehicles or hybrid vehicles still have a certain gap in cruising range and short-term acceleration capability, which puts forward higher requirements for the power density and energy density of lithium-ion batteries. Therefore, research on lithium-ion electrode materials with high energy density and high power density has become an inevitable trend in the development of the battery industry. As a key factor affecting the performance of lithium-ion batteries, positive electrode materials have been developed with high capacity and high power density. New positive electrode ...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M10/0525C01G53/00
CPCC01G53/006C01P2002/72C01P2004/03C01P2006/40H01M4/525H01M10/0525Y02E60/10
Inventor 刘艳吴磊冯黎伟张登科秦文超
Owner SHANGHAI APPLIED TECHNOLOGIES COLLEGE
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