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Cathode material, preparation method thereof and lithium ion battery

A technology for lithium-ion batteries and positive electrode materials, applied in the direction of positive electrodes, secondary batteries, battery electrodes, etc., can solve the problems of inability to be covered by materials, many defects, and inability to be covered, and achieve improved liquid retention capacity and high mechanical strength , the effect of great use value

Active Publication Date: 2020-09-04
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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  • Cathode material, preparation method thereof and lithium ion battery
  • Cathode material, preparation method thereof and lithium ion battery

Examples

Experimental program
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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 invention relates to a positive electrode material, a preparation method thereof and a lithium ion battery. The positive electrode material comprises a dodecahedron skeleton and a positive electrode active material, and the positive electrode active material is arranged on the surface and inside the dodecahedron skeleton. The positive electrode active material is arranged on the surface and inside the dodecahedron skeleton (three-dimensional structure), and the structure can effectively relieve structural collapse caused by volume change of the positive electrode material in the lithium de-intercalation and intercalation process of the material. Meanwhile, the dodecahedron structure has a large specific surface area, can contain more electrolyte, improves the liquid retention capability, and also has high 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 charging and discharging, 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, ...

Claims

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Application Information

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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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