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A kind of lithium cobalt oxide composite cathode material and preparation method thereof

A composite positive electrode material and a technology of positive electrode materials, which are applied in the field of preparation of lithium cobaltate composite positive electrode materials, can solve problems such as poor cycle performance, and achieve the effects of high specific capacity, low cost, and simple process

Active Publication Date: 2022-04-05
TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, after one or more positive electrode materials of power lithium batteries are nanometerized, continuous high-speed extrusion is carried out with lithium cobalt oxide positive electrode materials in a certain proportion to obtain lithium cobalt oxide composite positive electrodes coated with positive electrode materials of nano-power lithium batteries. The material solves the problem of poor cycle performance of lithium cobaltate at high temperature or high pressure, thereby completing the present invention

Method used

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  • A kind of lithium cobalt oxide composite cathode material and preparation method thereof
  • A kind of lithium cobalt oxide composite cathode material and preparation method thereof
  • A kind of lithium cobalt oxide composite cathode material and preparation method thereof

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preparation example Construction

[0043] In the present invention, on the one hand, a method for preparing a high-capacity and high-voltage lithium cobalt oxide composite positive electrode material is provided, and the method includes the following steps:

[0044] Step 1, prepare the first type of positive electrode material I, and refine it;

Embodiment approach

[0045] According to a preferred embodiment of the present invention, the first type of positive electrode material I is a positive electrode material for a power lithium battery.

[0046] In a further preferred embodiment, the positive electrode material of the power lithium battery is one or more of lithium manganate, NCM523, NCM622, NCA, lithium iron phosphate, and lithium vanadium phosphate.

[0047] In a further preferred embodiment, the positive electrode material of the power lithium battery is one or more of lithium manganate, lithium iron phosphate and lithium vanadium phosphate.

[0048] Among them, the synthesis process of lithium manganate is simple, the thermal stability is good, and the rate performance and low temperature performance are superior. Lithium iron phosphate has good thermal stability and cycle performance, which is due to the stabilizing effect of the phosphate-based polyanion in the structure on the framework of the entire material. Lithium vanadiu...

Embodiment 1

[0129] 500g of commercial lithium iron phosphate cathode material and 5000g of grinding balls were weighed and mixed uniformly according to the mass ratio of 1:10, and then added to a 5L high-speed heating mixer. Start the mixer at a speed of 100 r / min, weigh anhydrous ethanol according to a solid content of 80%, and slowly pour it into the mixer, and continue stirring for 15 minutes.

[0130] Set the cooling temperature of the high-speed heating mixer to 20°C, connect nitrogen gas to the protective gas valve, set the gas flow rate to 5L / min, adjust the speed of the mixer to 2500r / min, and continue stirring for 6 hours to complete the nanometerization .

[0131] Finally, the heating temperature of the high-speed heating mixer is adjusted to 55 degrees Celsius, the rotating speed is adjusted to 100r / min, the vacuum valve is opened, and vacuum filtration is carried out for 6 hours until the liquid in the mixed material is completely volatilized.

[0132] The mixed material is r...

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Abstract

The invention relates to a method for preparing a high-capacity and high-voltage lithium cobalt oxide composite positive electrode material, comprising the following steps: 1. Prepare the first type of positive electrode material I and refine it; 2. After refining the positive electrode material I processing to obtain the nanoscale positive electrode material I; 3, mixing the nanoscale positive electrode material I with the second type of positive electrode material II to prepare lithium cobaltate composite positive electrode material. The preparation method provided by the invention is simple and efficient in operation, and is easy to realize large-scale transformation of products. The lithium cobaltate composite cathode material prepared by the preparation method provided by the invention has high capacity performance and compaction performance, and exhibits excellent high-temperature cycle performance under high voltage.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a preparation method of a lithium cobalt oxide composite positive electrode material. Background technique [0002] After years of development of lithium cobalt oxide cathode material, its working voltage has been increased from 4.2V to 4.3V, 4.35V, 4.4V, 4.45V and 4.5V year by year. According to current industry research, 4.45V and 4.5V lithium cobalt oxide cathode materials are facing many material problems, such as poor high-temperature storage, poor high-temperature cycle performance, and poor universality to various electrolytes. [0003] Although various R&D teams have adopted various high-temperature solid-phase coating methods for lithium cobalt oxide cathode materials along the lines of doping and coating, they still cannot effectively reduce the risks brought about by high voltage. And too much introduction of the inert coating layer will inevitably red...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/58B82Y30/00H01M10/0525
CPCH01M4/366H01M4/525H01M4/5825B82Y30/00H01M10/0525Y02E60/10
Inventor 卢兴华白珍辉沈恋魏卫凌仕刚沙金苏迎春
Owner TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD
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