AZO-coated lithium manganate cathode material for secondary lithium battery and preparation method of same

A technology for secondary batteries and cathode materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as adverse environmental impact, price reduction, poor cycle performance, etc., to improve high-current discharge characteristics, improve high-temperature characteristics, good The effect of crystallinity

Active Publication Date: 2013-04-03
安徽博石高科新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For LiCoO 2 In terms of cobalt, because the abundance of cobalt in the earth's crust is very low, the price of cobalt is very expensive, and cobalt has certain toxicity, and it will have adverse effects on the environment after being discarded; LiNi 1-x co x o 2 with LiCoO 2 Compared with LiFePO, the actual use capacity has been improved, and the price has been reduced, but there are problems such as poor security; LiFePO 4 It has the advantages of stable structure, cheap raw materials, good recyclability and safety, and less burden on the environment, but there are also problems such as high synthesis cost and low energy density; spinel LiMn 2 o 4 It has the advantages of good safety, good rate characteristics, low price, and environmental protection. It is also a mainstream cathode material at present, but its energy density is low, and the capacity decays quickly in the charge-discharge cycle, especially at high temperature. Poor performance limits its application in large power lithium-ion batteries and energy storage batteries

Method used

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  • AZO-coated lithium manganate cathode material for secondary lithium battery and preparation method of same
  • AZO-coated lithium manganate cathode material for secondary lithium battery and preparation method of same
  • AZO-coated lithium manganate cathode material for secondary lithium battery and preparation method of same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] With Zn(CH 3 COO) 2 2H 2 O:LiMn 2 o 4 The mass ratio is that 0.015:1 weighs the LiMn that zinc acetate and comparative example 1 make 2 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 LiMn to the above solution 2 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 sintered at a constant temperature of 600°C in an air atmosphere for 8h to obtain 1.5 wt%AZO coated LiMn 2 o 4 .

Embodiment 2

[0049] With Zn(CH 3 COO) 2 2H 2 O:LiMn 2 o 4 The mass ratio is that 0.015:1 weighs the LiMn that zinc acetate and comparative example 1 make 2 o 4 , weigh aluminum nitrate with the molar ratio of Al:Zn being 0.03:1, 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 LiMn to the above solution 2 o 4 , the mixed solution was stirred in a constant temperature water bath at 80°C for 4h to obtain a precursor, the obtained precursor was dried at a constant temperature of 110°C in an air atmosphere for 12h, and the obtained powder was sintered at a constant temperature of 750°C in an air atmosphere for 7h to obtain 3.0 wt%AZO coated LiMn 2 o 4 .

Embodiment 3

[0051] With Zn(CH 3 COO) 2 2H 2 O:LiMn 2 o 4 The mass ratio is that 0.015:1 weighs the LiMn that zinc acetate and comparative example 1 make 2 o 4 , weigh aluminum nitrate with the molar ratio of Al:Zn being 0.045:1, 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 60min, and then add Add weighed LiMn to the above solution 2 o 4 , the mixed solution was stirred in a 90°C constant temperature water bath for 3h to obtain a precursor, the obtained precursor was dried at a constant temperature of 120°C in an air atmosphere for 12h, and the obtained powder was sintered at a constant temperature of 900°C in an air atmosphere for 6h to obtain 4.5 wt%AZO coated LiMn 2 o 4 .

[0052] From figure 1 It can be seen that no matter it is Comparative Example 1 or Examples 1-3, the samples obtained according to our designed experimental route do not see the...

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Abstract

The invention provides a cathode material for a lithium ion secondary battery, which is represented by a general formula of x (AlyZn1-yO)/(1-x)LiMn2O4. LiMn2O4 is coated with an AlyZn1-yO thin film, wherein x is more than or equal to 0 and less than or equal to 0.5; and y is more than or equal to 0 and less than or equal to 0.2. The invention further provides a preparation method of the cathode material, a lithium ion secondary battery anode adopting the cathode material and a lithium ion secondary battery adopting the cathode material. The cheap and environmental-friendly Al-doped ZnO thin film is adopted to carry out surface decoration on a LiMn2O4 material. On one hand, the large-current discharge characteristic of the material is improved by improving electronic conductivity; and on the other hand, the existence of the thin film can also prevent decomposition of an electrolyte on the surface of an active material so as to improve the high temperature characteristic of the electrolyte.

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 Applications(China)
IPC IPC(8): H01M4/505
CPCY02E60/10
Inventor 李德成孙洪丹刘伟伟方国清夏丙波王海波吴晶晶
Owner 安徽博石高科新材料股份有限公司
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