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Asymmetric secondary air fuel battery

A secondary air and fuel cell technology, applied in the field of electrochemical energy storage, can solve the problems of difficult commercialization of batteries and high battery costs

Inactive Publication Date: 2008-04-23
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used air electrodes use precious metals such as platinum, rhodium, and silver as catalysts, and the catalytic effect is relatively good, but this makes the battery cost high and the battery is difficult to commercialize

Method used

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  • Asymmetric secondary air fuel battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Take LiTi 2 (PO 4 ) 3 As a negative electrode material, the electrode preparation method is as follows: conductive agent (acetylene black): binder (PTFE): LiTi 2 (PO 4 ) 3 = 5: 10: 85 ratio mixing slurry, rolling into film, and pressing it onto foamed nickel mesh to form negative electrode film. Positive electrode adopts the active carbon that has loaded manganese tetraoxide as catalyst, and catalytic layer preparation method is with conductive agent (acetylene black): binding agent (PTFE): active carbon (supporting 20wt% manganese tetraoxide)=5: 10: 85 Mix the slurry in proportion, roll it into a film, and cut it into a pole piece of a certain size. The gas diffusion layer is formed by mixing acetylene black: binder = 60:40 into a slurry and rolling it into a film. The gas diffusion layer and the catalyst layer are sequentially pressed onto the foamed nickel mesh to form the positive electrode membrane. The electrolyte is 1M NaOH gel electrolyte, which is prepar...

Embodiment 2

[0018] The negative electrode is carbon-coated LiTi 2 (PO 4 ) 3 , and its synthesis method is as follows: 3g LiTi 2 (PO 4 ) 3 Be dispersed in the aqueous solution that contains 2wt%PVA (polyvinyl alcohol) in 100ml, stir at high temperature and evaporate the solution to dryness, put into tube furnace under N 2 Calcination at 900℃ under atmosphere to obtain carbon-coated modified LiTi 2 (PO 4 ) 3 The composite material has a carbon content of 36 wt% as tested by thermogravimetric analysis. LiTi coated with carbon 2 (PO 4 ) 3 is the negative electrode material, and the rest are the same as in Example 1, and the battery is prepared according to the steps and conditions in Example 1. at 5mA / cm 2 Under the same current density, the charging voltage platform remains unchanged, still around 1.2V, and the initial charging capacity is 83mAh / g; the discharging platform is at 0.66V, and the initial discharging capacity is 74mAh / g. The coulombic efficiency and cycle performanc...

Embodiment 3

[0020] Adopt the method for gas phase deposition to the LiTi of carbon coating in embodiment 2 2 (PO 4 ) 3 Carry out further carbon coating modification, its synthetic method is: with the LiTi of carbon coating in embodiment 2 2 (PO 4 ) 3The material is the bulk, placed in a tube furnace. Toluene is used as the carbon source, Ar gas is used as the gas source, the gas flow rate is controlled, and the toluene vapor is blown into the tube furnace, during which the temperature of the tube furnace is programmed to rise to the reaction temperature of 900°C. When the furnace temperature reaches the required temperature, the furnace temperature is controlled. 300min at the reaction temperature. After being cooled, it is ground to obtain the desired carbon-coated LiTi 2 (PO 4 ) 3 Material. with PVA-coated LiTi 2 (PO 4 ) 3 In contrast, the vapor deposition method can uniformly deposit a layer of nanometer-thick graphitized carbon layer on the particle surface, ensuring that ...

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Abstract

This invention relates to a new type of asymmetrical secondary air fuel batteries, in which, the positive of the material is an air pole taking Mn oxide as the catalyst, and the negative is a pole material inserted with Na or Li ions and the electrolyte is a gel electrolyte containing Na or Li salt, in the process of charging or discharging, the air pole as the positive recovers or releases oxygen and the negative is inserted or separated with Li or Na ions so as to constitute a new type of asymmetrical air fuel battery.

Description

technical field [0001] The invention belongs to the technical field of electrochemical energy storage, and in particular relates to a novel asymmetric charge-discharge air fuel cell. Background technique [0002] With the continuous development of the economy, it will inevitably lead to the depletion of oil resources, environmental pollution, and the aggravation of global warming. The comprehensive and efficient development and utilization of new energy, energy-saving technology, and environmental technology has become a very necessary subject. Metal-air battery is a new concept fuel cell formed by using metal fuel instead of hydrogen energy. With the comprehensive and efficient development and utilization of new energy, energy-saving technology and environmental protection technology, metal-air batteries are expected to become a new generation of green energy. It takes advantage of many advantages of fuel cells, such as non-toxic, non-polluting, stable discharge voltage, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M12/08H01M4/94H01M4/90H01M12/02H01M4/58H01M4/48
CPCY02E60/50Y02E60/128Y02E60/10
Inventor 夏永姚李峰罗加严
Owner FUDAN UNIV
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