Lithium air battery cathode material and preparation method thereof, and lithium air battery

A lithium-air battery, cathode material technology, applied in battery electrodes, fuel cell-type half-cells and secondary battery-type half-cells, chemical instruments and methods, etc., can solve the problem of increased battery polarization, poor electrical conductivity, Increase the electron transport resistance and other issues to achieve the effect of catalyzing the battery reaction, improving the cycle life and good reversibility

Inactive Publication Date: 2019-07-12
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, transition metal oxides themselves have poor electrical conductivity, and their application in lithium-air batteries will increase electron transport resistance and eventually lead to increased battery polarization. Therefore, it is necessary to seek alternatives to transition metal oxides with high conductivity to solve this problem. Favorable way

Method used

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  • Lithium air battery cathode material and preparation method thereof, and lithium air battery
  • Lithium air battery cathode material and preparation method thereof, and lithium air battery
  • Lithium air battery cathode material and preparation method thereof, and lithium air battery

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Experimental program
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Effect test

Embodiment 1

[0028] The cobalt salt in this embodiment is cobalt nitrate, and the sulfur source is thioacetamide as an example.

[0029] The positive electrode material and preparation method provided in this embodiment, and the preparation method of lithium-air battery include the following steps:

[0030] 1. Preparation of ZIF-67: 0.4-0.6g Co(NO 3 ) 2 ·6H 2 Dissolve O in 20-30ml of methanol to obtain solution A; dissolve 0.5-1.0g of 2-methylimidazole in 20-30ml of methanol to obtain solution B; then add solution B to solution A, stir and stand still, and take the precipitate things. The particle size of the prepared ZIF-67 is about 300-500nm.

[0031] 0.5g Co(NO 3 ) 2 ·6H 2 O was dissolved in 20ml methanol to obtain solution A. Solution B was obtained by dissolving 0.75 g of 2-methylimidazole in 20 ml of methanol. While stirring, solution B was slowly added to solution A, and after stirring for 5 minutes, it was allowed to stand at room temperature for 24 hours. The precipitate...

Embodiment 2

[0041] The cobalt salt in this embodiment is cobalt nitrate, and the sulfur source is thioacetamide as an example.

[0042] The positive electrode material and preparation method provided in this embodiment, and the preparation method of lithium-air battery include the following steps:

[0043] 1. Preparation of ZIF-67: 0.6g Co(NO 3 ) 2 ·6H 2 O was dissolved in 30ml methanol to obtain solution A. Solution B was obtained by dissolving 1.0 g of 2-methylimidazole in 30 ml of methanol. While stirring, solution B was slowly added to solution A, and after stirring for 5 minutes, it was allowed to stand at room temperature for 24 hours. The precipitate was collected by centrifugation, washed several times with ethanol, and dried in vacuum at 60°C to obtain ZIF-67. The particle size of the prepared ZIF-67 is about 400nm.

[0044] 2. Add 0.4g of ZIF-67 and 1.0g of thioacetamide to 30ml of ethanol respectively, and ultrasonically form a uniform dispersion. The above solution was ...

Embodiment 3

[0049] The cobalt salt in this embodiment is cobalt nitrate, and the sulfur source is thioacetamide as an example.

[0050] The positive electrode material and preparation method provided in this embodiment, and the preparation method of lithium-air battery include the following steps:

[0051] 1. Preparation of ZIF-67: 0.5g Co(NO 3 ) 2 ·6H 2 O was dissolved in 25ml methanol to obtain solution A. Solution B was obtained by dissolving 0.75 g of 2-methylimidazole in 25 ml of methanol. While stirring, solution B was slowly added to solution A, and after stirring for 5 minutes, it was allowed to stand at room temperature for 24 hours. The precipitate was collected by centrifugation, washed several times with ethanol, and dried in vacuum at 60°C to obtain ZIF-67. The particle size of the prepared ZIF-67 is about 300nm.

[0052] 2. Add 0.35g ZIF-67 and 1g thioacetamide to 30ml ethanol respectively, and ultrasonically form a uniform dispersion. The above solution was transferr...

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Abstract

The invention discloses a lithium air battery cathode material and a preparation method thereof, and a lithium air battery. The cathode material is a cobalt sulfide which is a hollow core-shell dodecahedron structure; ZIF-67 and a sulphur source are dissolved in a solvent to form a mixed solution; the mixed solution is subjected to heating, heat preservation, cooling and drying by employing a hydrothermal method to take out a precipitate, namely the lithium air battery cathode material. The hydrothermal method is employed to perform vulcanization of the ZIF-67 to obtain the cathode material, the preparation method is simple, the cathode material has the electrochemical catalytic activity, the lithium air battery prepared by employing the cathode material is excellent, has the coulombic efficiency up to 86.6%, can show better reversibility, and can effectively improve the cycle life of the battery: when the specific discharge capacity is controlled to 500 mAh g<-1>, the lithium air battery can stably cycle for 32 loops until the voltage is stabilized above 2.0V.

Description

technical field [0001] The invention relates to an electrode material, a preparation method and the field of lithium batteries, in particular to a lithium-air battery cathode material, a preparation method thereof, and a lithium-air battery. Background technique [0002] Li-air battery (Li-O 2 ) has attracted much attention due to its ultra-high theoretical energy density, and its theoretical specific energy is as high as 5200Wh kg -1 , much higher than the conventional lithium-ion battery system, the most promising power source for a new generation of electric vehicles. Its energy storage principle is based on the reaction between metal lithium and oxygen. However, in the absence of a catalyst, the reduction reaction of oxygen at the cathode is very slow. In order to reduce the electrochemical polarization during the positive electrode reaction, an efficient catalyst needs to be added. [0003] Pt, Au, Pd, Ru and other precious metals and alloys have been used as oxygen r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/86H01M12/08C01G51/00
CPCC01G51/30H01M4/86H01M4/8673H01M4/9091H01M12/08Y02E60/10
Inventor 林秀婧马延文刘瑞卿李壮张婷婷
Owner NANJING UNIV OF POSTS & TELECOMM
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