Air electrode for lithium-air battery and preparation method for air electrode

An air electrode and air battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor charge and discharge utilization, fewer cycles, and low channel utilization, and achieve improved rate performance and easy large-scale production. , the effect of eliminating the preparation process

Active Publication Date: 2013-07-24
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently used porous carbon air cathodes are all obtained by stacking carbon materials to create pores. The utilization rate of the pores is low, the connectivity is poor, and the mass transfer capacity is poor, so that the discharge product Li 2 o 2 The storage space of lithium-air batteries is limited, which directly leads to high overpotential of lithium-air batteries, poor charge and discharge utilization and low number of cycles.
On the other hand, the oxygen reduction / precipitation catalyst in the existing porous carbon air cathode is mainly loaded by mechanical mixing, which cannot effectively exert the synergistic effect between the carrier and the catalyst, and further deteriorates the energy conversion efficiency and rate of lithium-air batteries. performance

Method used

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  • Air electrode for lithium-air battery and preparation method for air electrode
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  • Air electrode for lithium-air battery and preparation method for air electrode

Examples

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Effect test

Embodiment 1

[0048] (1) Add 15mL of concentrated ammonia water, 150mL of ethanol, 15mL of deionized water, and 15mL of ethyl orthosilicate into a round bottom flask and stir for 5 hours. The obtained product is centrifuged, washed and dried at 100°C to obtain Highly dispersed silica spheres.

[0049] (2) Add 6mL of 3-mercaptopropyltrimethoxysilane and 2.0g of silicon spheres to 200mL of toluene in sequence, reflux at 110°C for 10 hours, then cool at room temperature, centrifuge, wash and dry to obtain mercaptosilane spheres.

[0050] (3) The two electrodes are carbon paper and steel sheet respectively, the distance between the electrodes is 0.5cm, the electrolyte is mercaptosilicate silicon balls dispersed in a mixed solvent of acetone and methanol with a volume ratio of 1:1, and the electrophoresis voltage is 15V to obtain mercaptosilicate Silicon spherical carbon paper electrode.

[0051] (4) Soak the mercapto-silicon spherical carbon paper electrode in a chloroform solution of palladiu...

Embodiment 2

[0058] (1) Add 15mL of concentrated ammonia water, 300mL of ethanol, 75mL of deionized water, and 30mL of ethyl orthosilicate into a round bottom flask and stir for 10 hours. The obtained product is centrifuged, washed and dried at 100°C to obtain Highly dispersed silica spheres.

[0059] (2) Add 30mL of mercaptopropionic acid and 2.0g of silicon spheres to 200mL of toluene in turn, reflux at 110°C for 12 hours, then cool at room temperature, centrifuge, wash, and dry to obtain mercaptosilica spheres.

[0060] (3) The two electrodes are carbon paper and steel sheet respectively, the distance between electrodes is 2.0cm, the electrolyte is mercaptosilicate silicon balls dispersed in the mixed solvent of acetone and methanol with a volume ratio of 10:1, and the electrophoresis voltage is 25V to obtain mercaptosilicate Silicon spherical carbon paper electrodes.

[0061] (4) Soak the mercapto-silicon spherical carbon paper electrode in the chloroauric acid solution with a mass co...

Embodiment 3

[0064] (1) Add 15mL of concentrated ammonia water, 200mL of ethanol, 45mL of deionized water, and 15mL of ethyl orthosilicate into a round bottom flask and stir for 18 hours. The obtained product is centrifuged, washed and dried at 100°C.

[0065] (2) Add 20mL of mercaptoethanol and 2.0g of silicon spheres to 200mL of toluene in turn, reflux at 110°C for 15 hours, then cool at room temperature, centrifuge, wash, and dry to obtain mercaptosilane spheres.

[0066] (3) The two electrodes are carbon paper and steel sheet respectively, the distance between electrodes is 1.0cm, the electrolyte is mercaptosilicate silicon balls dispersed in a mixed solvent of acetone and methanol with a volume ratio of 1:10, and the electrophoresis voltage is 20V to obtain mercaptosilicate Silicon spherical carbon paper electrodes.

[0067] (4) Soak the mercaptosilicon spherical carbon paper electrode in manganese acetate solution with a mass concentration of 8% for half an hour, filter, dry, and cal...

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Abstract

The invention relates to an air electrode for a lithium-air battery and a preparation method for the air electrode, which belong to the field of electrochemical energy materials, and aim to solve the technical problems of high overpotential, low charging and discharging utilization rate and few cycle times of a lithium-air battery in the prior art. The air electrode for the lithium-air battery is made of a nanocrystalline catalyst-modified hollow carbon sphere and carbon paper air electrode material with a hierarchical porous structure. When the air electrode is used for the lithium-air battery, the specific energy, energy utilization efficiency, rate capability and cycling stability of the lithium-air battery can be effectively improved, and particularly, the cycle life of the lithium-air battery is prolonged to 205 times from conventional maximum 100 times reported by documents. According to the preparation method for the air electrode, a hard template method and an electrophoretic technology are reasonably combined, a process is simple, the operation is convenient, the cost is low, an additive is avoided, a complex powder electrode preparation process is eliminated, and the stability of an air positive electrode is greatly improved.

Description

technical field [0001] The invention relates to the technical field of electrochemical energy materials, in particular to an air electrode for a lithium-air battery and a preparation method thereof. Background technique [0002] Lithium-air batteries have attracted extensive attention due to their high theoretical energy density, but in order to realize their applications, a series of problems need to be solved, such as high overpotential, poor charge and discharge utilization, and low cycle times. When a lithium-air battery is working, oxygen is first reduced to O on the surface of the porous carbon air cathode. 2 - , followed by Li in the electrolyte + combined to form the product Li 2 o 2 . Due to the discharge product Li 2 o 2 It cannot be dissolved in organic electrolyte, so it can only be deposited on the air positive electrode with peroxide negative ions. However, the currently used porous carbon air positive electrodes are all obtained by stacking carbon mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88
CPCY02E60/50
Inventor 张新波徐吉静
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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