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Positive material of AZO-coated lithium nickel manganese oxide secondary lithium battery and preparation method of positive pole material

A technology for secondary batteries and positive electrode materials, applied in secondary batteries, battery electrodes, circuits, etc., can solve problems such as difficulty in preparing high-purity samples, improvement of high-current cycle characteristics, etc., to improve electronic conductivity and improve high-current discharge. characteristics, the effect of improving high temperature characteristics

Active Publication Date: 2015-07-15
新乡市中天新能源科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there are also some shortcomings, such as the difficulty in preparing high-purity samples, and the high-temperature and high-current cycle characteristics need to be improved.

Method used

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  • Positive material of AZO-coated lithium nickel manganese oxide secondary lithium battery and preparation method of positive pole material
  • Positive material of AZO-coated lithium nickel manganese oxide secondary lithium battery and preparation method of positive pole material
  • Positive material of AZO-coated lithium nickel manganese oxide secondary lithium battery and preparation method of positive pole material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] With Zn(CH 3 COO) 2 2H 2 O:LiNi 0.5 mn 1.5 o 4 The mass ratio of 0.015:1 weighs the LiNi that zinc acetate and comparative example 1 make 0.5 mn 1.5 o 4 , add zinc acetate to a certain amount of distilled water to dissolve, add a certain amount of citric acid solution dropwise to the above solution, stir for 30min, and then add weighed LiNi to the above solution 0.5 mn 1.5 o 4 , Stir the mixed solution in a constant temperature water bath at 60°C for 5h to obtain a precursor, dry the obtained precursor at a constant temperature of 100°C in an air atmosphere for 12h, pre-fire the obtained powder at a constant temperature of 500°C in an air atmosphere for 6h, and naturally After cooling, the coated LiNi 0.5 mn 1.5 o 4 , the above compound was sintered at a constant temperature of 700 °C for 10 h in an air atmosphere to obtain LiNi coated with 1.5 wt% ZnO 0.5 mn 1.5 o 4 .

Embodiment 2

[0048] With Zn(CH 3 COO) 2 2H 2 O:LiNi 0.5 mn 1.5 o 4 The mass ratio of 0.015:1 weighs the LiNi that zinc acetate and comparative example 1 make 0.5 mn 1.5 o 4 , weigh aluminum nitrate with the molar ratio of Al:Zn being 0.015:1, add zinc acetate and aluminum nitrate to a certain amount of distilled water to dissolve, add a certain amount of citric acid solution dropwise to the above solution, stir for 30min, and then add Add weighed LiNi to the above solution 0.5 mn 1.5 o 4 , the mixed solution was stirred in a 70°C constant temperature water bath for 5h to obtain a precursor, the obtained precursor was dried at a constant temperature of 100°C in an air atmosphere for 12h, and the obtained powder was pre-fired at a constant temperature of 500°C in an air atmosphere for 6h, naturally After cooling, the coated LiNi 0.5 mn 1.5 o 4 , the above compound was sintered at a constant temperature of 700 °C for 10 h in an air atmosphere to obtain LiNi coated with 1.5 wt% AZ...

Embodiment 3

[0050] With Zn(CH 3 COO) 2 2H 2 O:LiNi 0.5 mn 1.5 o 4 The mass ratio of 0.03:1 weighs the LiNi that zinc acetate and comparative example 1 make 0.5 mn 1.5 o 4 , weigh aluminum nitrate with the molar ratio of Al:Zn being 0.015:1, add zinc acetate and aluminum nitrate to a certain amount of distilled water to dissolve, add a certain amount of citric acid solution dropwise to the above solution, stir for 45min, and then add Add weighed LiNi to the above solution 0.5 mn 1.5 o 4 , Stir the mixed solution in a constant temperature water bath at 80°C for 4h to obtain a precursor, dry the obtained precursor at a constant temperature of 110°C in an air atmosphere for 12h, pre-fire the obtained powder at a constant temperature of 600°C in an air atmosphere for 5h, and naturally After cooling, the coated LiNi 0.5 mn 1.5 o 4 , the above compound was sintered at a constant temperature of 800 °C for 9 h in an air atmosphere to obtain 3wt% AZO-coated LiNi 0.5 mn 1.5 o 4 .

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Abstract

The invention provides a positive material of a lithium ion secondary battery, which is represented by a general formula x(AlyZn[1-y]O) / (1-x)LiNi0.5Mn1.5O4. LiNi0.5Mn1.5O4 is coated by an AlyZn[1-y]O thin film, wherein x is not less than 0 and not more than 0.5; and y is not less than 0 and not more than 0.2. The invention further provides a preparation method of the positive pole material, a positive pole of the lithium ion secondary battery positive pole prepared by using the positive material and the lithium ion secondary battery. The cheap and environment-friendly Al-doped ZnO thin film is adopted for performing surface modification on the LiNi0.5Mn1.5O4 material, on the one hand, the high-current discharge property of the material is improved by improving electron conductivity, and on the other hand, the existence of the thin film can prevent the decomposition of electrolyte on the surface of active substances and further improves the high-temperature property of the material.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a lithium-ion secondary battery cathode material and a preparation method thereof, a lithium-ion secondary battery cathode and a lithium-ion secondary battery. Background technique [0002] Secondary batteries, also known as rechargeable batteries, are batteries that can be activated by charging the active material after the battery is discharged and continue to be used. Compared with dry batteries, secondary batteries can be recharged for thousands to tens of thousands of times, and are a new type of environmentally friendly battery. [0003] The secondary batteries currently on the market mainly include lead-acid batteries, nickel-cadmium batteries, nickel-metal hydride batteries and lithium-ion batteries. Lead-acid batteries are cheap but contain heavy metal lead that pollutes the environment. Nickel-cadmium batteries are more environmentally friendly but have l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/131H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 李德成孙洪丹刘伟伟方国清夏丙波吴晶晶王海波
Owner 新乡市中天新能源科技股份有限公司
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