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A kind of cathode material, its preparation method and lithium ion battery

A technology of positive electrode materials and positive active materials, which is applied in the field of positive electrode materials and its preparation, can solve the problems of not being able to coat materials, not being able to coat, and being difficult to disperse, etc., to achieve the goal of improving liquid retention capacity, large use value, and ensuring electrical conductivity Effect

Active Publication Date: 2021-12-14
HUBEI JINQUAN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, considering the experimental conditions and costs required by these two methods, they are not conducive to large-scale application.
[0006] At present, the second most commonly used coating method is: first mix the precursor with lithium and carbon, mix them evenly by ball milling, and then sinter them in an atmosphere furnace under inert gas protection conditions. This method is an ex-situ coating method and cannot It is very good to completely cover the material, even it cannot be coated on the surface of the material, and there are many defects; and in the process of coating carbon black materials, because carbon black has the characteristics of small specific surface area and small particles, it is difficult to disperse. Surface treatment is required, increasing the cost of the preparation process

Method used

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  • A kind of cathode material, its preparation method and lithium ion battery
  • A kind of cathode material, its preparation method and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] A preparation method of positive electrode material:

[0057] (1) Co(NO 3 ) 2 ·6H 2 The ratio of O and 2-methylimidazole is 1:4 to prepare solutions separately: Co(NO 3 ) 2 ·6H 2 O is dissolved in the mixed solvent of 20mL ethanol+20mL methanol to obtain the first solution, and 2-methylimidazole is dissolved in the mixed solvent of 20mL ethanol+20mL methanol to obtain the second solution;

[0058] (2) then the first solution, the second solution, surfactant (sodium lauryl sulfate) and ammonia (25wt%) were mixed and stirred for 5min to obtain a mixed solution with a pH value of 8, and the surface Active agent mass and Co(NO 3 ) 2 ·6H 2 The mass ratio of O is 1:8;

[0059] Then, the mixed solution was subjected to hydrothermal treatment at a temperature of 100° C. for 48 hours, filtered, and dried to obtain a ZIF-67 precursor;

[0060] (3) Under a nitrogen atmosphere, the ZIF-67 precursor is calcined at a temperature of 800° C. for 12 hours to obtain a dodecahed...

Embodiment 2

[0064] A preparation method of positive electrode material:

[0065] (1) Zn(NO 3 ) 2 ·6H 2 The ratio of O and 2-methylimidazole is 1:4 to prepare solutions respectively: Zn(NO 3 ) 2 ·6H 2 O is dissolved in the mixed solvent of 20mL ethanol+20mL methanol to obtain the first solution, and 2-methylimidazole is dissolved in the mixed solvent of 20mL ethanol+20mL methanol to obtain the second solution;

[0066] (2) then the first solution, the second solution, surfactant (sodium lauryl sulfate) and ammonia (25wt%) were mixed and stirred for 5min to obtain a mixed solution with a pH value of 10, and the surface The quality of active agent and Zn(NO 3 ) 2 ·6H 2 The mass ratio of O is 1:8;

[0067] Then, the mixed solution was subjected to hydrothermal treatment at a temperature of 120° C. for 24 hours, filtered, and dried to obtain a ZIF-8 precursor;

[0068] (3) Under a nitrogen atmosphere, the ZIF-8 precursor is calcined at a temperature of 1200° C. for 8 hours to obtain ...

Embodiment 3

[0072] The difference from Example 1 is that the temperature of the hydrothermal treatment in step (2) is 80°C.

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Abstract

The present invention relates to a positive electrode material, a preparation method thereof and a lithium ion battery. The positive electrode material includes a dodecahedron skeleton and a positive electrode active material; the positive electrode active material is disposed on the surface and inside of the dodecahedron skeleton. In the present invention, the positive electrode active material is arranged on the surface and inside of the dodecahedron skeleton (three-dimensional structure), and this structure can effectively alleviate the structural collapse caused by the volume change of the positive electrode material during the process of material de-intercalation; meanwhile, the dodecahedron structure has The larger specific surface area can accommodate more electrolyte, improve the liquid retention capacity, and also has high electrical conductivity and high mechanical strength.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a positive electrode material, a preparation method thereof and a lithium ion battery. Background technique [0002] As a new generation of clean energy, lithium-ion batteries have the advantages of high output voltage, high energy density, small self-discharge, long cycle life, no memory effect, fast charge and discharge, and environmental protection, and are widely used in various fields. After nearly two decades of development, the lithium-ion battery industry chain has formed an industrial chain system with a high degree of specialization and a clear division of labor. [0003] With the rapid development of various fields, especially the field of electric vehicles, lithium-ion batteries are required to have higher energy density, longer cycle life, and better safety performance. The cathode material is the bottleneck of the lithium-ion battery, whic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/62H01M10/0525C01G53/00
CPCH01M4/505H01M4/525H01M4/628H01M4/625H01M10/0525C01G53/006H01M2004/021H01M2004/028Y02E60/10
Inventor 杨子锐乔亚非胡哲
Owner HUBEI JINQUAN NEW MATERIALS CO LTD
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