Cathodic catalyst for lithium air battery and preparation method thereof

A technology for cathode catalysts and lithium-air batteries, applied in battery electrodes, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of increased catalyst preparation costs, complex preparation processes, and long synthesis routes, and shorten the preparation time , Simplify the preparation process, the effect of uniform particle size

Active Publication Date: 2011-11-16
浙江钠创新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the macrocyclic compound catalyst formed by the coordination of phthalocyanine and transition metal has complex preparation process and low yield, and the cost of raw materials for synthesizing macrocyclic compound is high, the synthesis route is long, and there are many side reactions, thereby greatly improving the preparation cost of the catalyst.

Method used

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  • Cathodic catalyst for lithium air battery and preparation method thereof
  • Cathodic catalyst for lithium air battery and preparation method thereof
  • Cathodic catalyst for lithium air battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] At 25°C, add 0.12g of manganese nitrate to 40g of water. After it is fully dissolved, add 0.206g of phenanthroline under stirring and react for 30 minutes to obtain manganese phenanthroline complex. Add 1g of carbon nanoparticles and continue stirring After 120 minutes, the water was removed by evaporation, and then heat-treated at 900° C. for 90 minutes in argon, and cooled to obtain a cathode catalyst for a lithium-air battery.

[0026] figure 1 It is the scanning electron micrograph of the lithium-air battery cathode catalyst that embodiment 1 obtains. It can be seen from the figure that the particle size of the powder is uniform, which is conducive to the contact reaction between the oxygen in the air and the active center. The first cycle discharge capacity of the lithium-air battery assembled with the cathode catalyst is 3210mAh (g active material unit mass) -1 (current density is 0.15mAcm -1 ), the discharge platform is 2.7V.

Embodiment 2

[0028] At 25°C, add 0.13g of cobalt acetate to 60g of absolute ethanol. After it is fully dissolved, add 0.206g of phenanthroline under stirring and react for 30 minutes to obtain a cobalt-phenanthroline complex. Add 1g of carbon nanoparticles , continue to stir for 120 minutes, evaporate to remove absolute ethanol, then heat-treat in argon at 900° C. for 90 minutes, and cool to obtain a cathode catalyst for a lithium-air battery.

[0029] figure 2 It is the charge-discharge curve graph of the lithium-air battery prepared by the cathode catalyst for the lithium-air battery obtained in Example 2. The discharge capacity of the first cycle reaches 4870mAh (g active material unit mass) -1 (current density is 0.05mA cm -1 ), the discharge voltage is stable at 2.8V.

Embodiment 3

[0031] At 10°C, add 0.14g of cobalt oxalate to 40g of water. After it is fully dissolved, add 0.18g of bipyridine under stirring and react for 30 minutes to obtain a cobalt bipyridine complex. Add 1g of carbon nanotubes and continue stirring for 120 minutes. , evaporated to remove water, and then heat-treated at 900° C. for 90 minutes in nitrogen, and cooled to obtain a cathode catalyst for lithium-air batteries. XRD test shows that the cobalt in the catalyst is in the cubic crystal form, which is consistent with the standard card PDF 89-4307. The first cycle discharge capacity of the lithium-air battery assembled with the cathode catalyst is 3310mAh (g active material unit mass) -1 (current density is 0.1mAcm -1 ), the discharge platform is 2.75V.

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Abstract

The invention discloses a cathodic catalyst for a lithium air battery and a preparation method thereof. The cathodic catalyst comprises a transition metal coordination complex and a carbon black carrier, wherein the transition metal complex is obtained by reacting cobalt salt or manganese salt with a nitrogenous ligand; the cathodic catalyst provides a catalytic center for the formation and the decomposition of lithium peroxide in the charge-discharge process of the lithium air battery; and the lithium air battery prepared by using the cathodic catalyst shows very good catalytic activity and stability, has the first circle discharge capacity reaching 4870 mAh / g<-1> (unit mass of active substances) when the current density is 0.05 mAcm<-1>, and has the discharge voltage stabilized to be 2.8 V. In the cathodic catalyst disclosed by the invention, the low-cost nitrogenous ligand is taken as a raw material; and compared with a noble metal catalyst or a macrocyclic compound catalyst generated by coordinating porphyrin and phthalocyanine with transition metal, the cathodic catalyst has the advantages of simple preparation process, good process repeatability, low cost and the like and can be used in the field of cathode materials of the lithium air battery.

Description

technical field [0001] The invention relates to a battery material and a preparation method thereof. In particular, a cathode catalyst for a lithium-air battery and a preparation method thereof. Background technique [0002] With the continuous development of economy and society, energy issues and environmental issues have attracted more and more attention, and finding environmentally friendly and sustainable energy technologies has become one of the top tasks of scientists. Lithium metal-based batteries have led the development of high-performance batteries in recent decades. This is due to the extremely low density, lowest electrode potential, and good electronic conductivity of lithium metal. With the successful commercialization of lithium-ion batteries by Sony in the 1990s, countries around the world have actively carried out research on improving the energy density of lithium-ion batteries and the stability of electrode materials. However, considering factors such a...

Claims

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Application Information

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IPC IPC(8): B01J31/22H01M4/90
CPCY02E60/50
Inventor 王红廖小珍马紫峰
Owner 浙江钠创新能源有限公司
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