Lithium cobaltate composite material and preparation method thereof as well as positive electrode material

A technology of composite materials and lithium cobalt oxide, which is applied in the chemical industry, can solve the problems of low capacitance and poor cycle performance of lithium cobalt oxide, and achieve the goal of increasing capacitance, improving comprehensive electrical conductivity, improving high temperature and high pressure cycle performance and rate performance Effect

Active Publication Date: 2017-05-10
HUNAN RESHINE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The first object of the present invention is to provide a lithium cobalt oxide composite material, which solves the problems of poor cycle performance and low capacitance of lithium cobalt oxide under high temperature or high pressure

Method used

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  • Lithium cobaltate composite material and preparation method thereof as well as positive electrode material
  • Lithium cobaltate composite material and preparation method thereof as well as positive electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0045] In Comparative Example 2, first cobalt nitrate (Co(NO 3 ) 2 ) and diammonium hydrogen phosphate ((NH 4 ) 2 HPO 4 ) were respectively dissolved in deionized water to form solutions with a concentration of 0.1 mol / L. Then mix a certain amount of lithium cobaltate oxide particles with appropriate pure water as the base liquid, and slowly add the cobalt nitrate solution and diammonium hydrogen phosphate solution prepared above dropwise by using a peristaltic pump while stirring, and continuously stir and disperse for 1 hour , the speed is 1400r / min, until the generated CoPO 4 The nanoparticles are evenly attached on the surface of the matrix, and then dried in a water bath at 90°C. Subsequently, the temperature was raised to 800°C at a rate of 3°C / min and kept for 3 hours. After the calcination was completed, the product to be obtained was lowered to 100°C, and then the calcined product was dispersed and sieved to obtain the final lithium cobalt phosphate Coated lithi...

Embodiment 2

[0047] Lithium carbonate (Li 2 CO 3 ) powder, nickel hydroxide (Ni(OH) 2 ) powder and manganese carbonate (MnCO 3 ) powder in molar ratio Li 2 CO 3 : Ni(OH) 2 : MnCO 3 =1:0.5:1.5 mixed to obtain LiNi 0.25 mn 0.75 o 4 The precursor powder, the precursor powder is processed by sand milling or ball milling until the average particle size becomes 1 μm or less, the resulting slurry is mixed with the lithium cobaltate matrix, and then cobalt nitrate (Co(NO 3 ) 2 ) and diammonium hydrogen phosphate ((NH 4 ) 2 HPO 4 ) were respectively dissolved in deionized water to form solutions with a concentration of 0.1 mol / L. While stirring, use a peristaltic pump to slowly add the above-mentioned cobalt nitrate solution and diammonium hydrogen phosphate solution dropwise, and keep stirring and dispersing for 1 hour at a speed of 1400r / min until the generated Co 3 (PO 4 ) 2 The nanoparticles were uniformly attached on the surface of the substrate, and then dried in a water bath ...

Embodiment 3

[0049] The difference from Example 2 is only that the final calcination heat treatment temperature is different, which is 700°C. Other experimental parameters are the same as in Example 2 to obtain a multilayer composite lithium cobaltate cathode material.

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Abstract

The invention provides a lithium cobaltate composite material and a preparation method thereof as well as a positive electrode material. The lithium cobaltate composite material is a material formed by coating lithium cobalt phosphate LiCoPO4 on surfaces of lithium cobaltate oxide particles; the molecular formula of the lithium cobaltate oxide particles is Li1+xCo1-yMyO2 and M is selected from one or more of magnesium, aluminum, zirconium, titanium, lanthanum, zinc and vanadium; the mass of the lithium cobalt phosphate is 0.25 percent to 10 percent of the mass of the lithium cobaltate oxide particles. By adopting the lithium cobaltate composite material, the problems that lithium cobaltate has poor circulating performance at high temperature or under high pressure and the electric capacity is low are solved.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a lithium cobalt oxide composite material, a preparation method thereof, and a positive electrode material. Background technique [0002] In recent years, with the widespread application of portable electronic devices, people have higher and higher requirements for the use of batteries, especially the requirements for capacity and high temperature resistance. Lithium-ion batteries have always occupied a dominant position in portable electronic devices due to their excellent comprehensive properties such as high operating voltage, small size, high specific energy, less pollution, and no memory effect. [0003] At present, among the positive electrode materials of lithium-ion batteries, lithium cobaltate occupies a large market due to its simple production process, large discharge capacity, and good cycle performance. The theoretical capacity is 274mAh / g. When the general operatin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/485H01M4/505H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/5825H01M4/628H01M10/0525H01M2220/30Y02E60/10
Inventor 刘小雨公伟伟周贵海王剑锋黄海翔宋振伟马群
Owner HUNAN RESHINE NEW MATERIAL
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