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Positive electrode active material, preparation method thereof, and lithium ion battery

A technology of cathode active materials and mixtures, applied in the field of materials, to achieve the effects of reducing initial irreversible capacity, improving cycle performance, and overall performance improvement

Active Publication Date: 2021-04-20
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of this, the present invention aims to propose a positive electrode active material to solve the problem of island-shaped coating (partial coating)

Method used

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  • Positive electrode active material, preparation method thereof, and lithium ion battery
  • Positive electrode active material, preparation method thereof, and lithium ion battery
  • Positive electrode active material, preparation method thereof, and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] In this example, a lithium-ion battery was prepared as follows:

[0074] 1. Mix aluminum nitrate and ethylene glycol, wherein the molar concentration of aluminum nitrate is 0.5M.

[0075] 2. React the mixture obtained above at 100° C. for 10 hours to obtain a polymer.

[0076] 3. Add the high molecular polymer into ethanol and dilute to a concentration of 0.01M.

[0077] 4. Mix the diluted solution obtained in the previous step with the nickel-cobalt-manganese ternary material, wherein the mass ratio of the diluted solution to the ternary material is 3:1, and then dry at 100°C for 8 hours.

[0078] 5. Heat-treat the dried product obtained in the previous step at 550° C. for 400 minutes to obtain a positive electrode active material.

[0079] 6. The lithium-ion battery is made of the positive electrode active material, the negative electrode artificial graphite, and the diaphragm as a glue-coated diaphragm based on PE base film.

Embodiment 2

[0081] A performance test was performed on the lithium-ion battery obtained in Example 1.

[0082] 1. The blue battery test system is used to test at 25°C, the test voltage range is 3V-4.3V, 0.1C charge and discharge 2 times, then 0.5C charge, 1C discharge cycle 50 times. The capacity retention rate after 50 cycles is greater than 94%, and the cycle performance is good ( image 3 ).

[0083] 2. The test is carried out under the condition of 25°C with the blue battery test system, the test voltage range is 3V-4.3V, 0.1C charge and discharge twice, the specific capacity of the first charge is about 230mAh / g, the specific capacity of the first discharge is about 208mAh / g, the first time The efficiency is greater than 90%, and the first discharge specific capacity and first efficiency are both high ( Figure 4 ).

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Abstract

The invention provides a positive electrode active material, a preparation method thereof, and a lithium ion battery. The positive electrode active material includes: a positive electrode active material matrix; and a coating layer, and the coating layer is completely coated on the positive electrode active material matrix The outer surface of the coating layer is formed of at least a metal oxide. The surface of the positive electrode active material of the present invention is formed with a continuous coated metal oxide, thereby avoiding the side reaction between the core and the electrolyte, reducing the initial irreversible capacity, improving the cycle performance, and improving the overall performance of the lithium ion battery.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a positive electrode active material, a preparation method thereof, and a lithium ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy, long life, safety, and environmental protection, and have been widely used in notebook computers, mobile phones, digital cameras, electric vehicles, energy storage and other fields. With the continuous development of demand for computers, mobile phones, electric vehicles, etc., batteries are required to have higher performance. [0003] At present, lithium composite metal compounds are widely used as positive electrode active materials of lithium secondary batteries, and lithium impurities inevitably exist on the surface thereof. The lithium impurities remaining on the surface will cause a negative reaction with the electrolyte, change the surface structure of the lithium composite metal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/62H01M10/0525
CPCY02E60/10
Inventor 崔胜弼陈修好崔军燕陈婷婷吴鹏磊楚志颖李子郯车金柱王涛白艳马忠龙杨红新
Owner SVOLT ENERGY TECHNOLOGY CO LTD