CN108550961A - A kind of air-fuel battery anode electrode film and preparation method thereof, a kind of air-fuel battery - Google Patents
A kind of air-fuel battery anode electrode film and preparation method thereof, a kind of air-fuel battery Download PDFInfo
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M12/00—Hybrid cells; Manufacture thereof
- H01M12/04—Hybrid cells; Manufacture thereof composed of a half-cell of the fuel-cell type and of a half-cell of the primary-cell type
- H01M12/06—Hybrid cells; Manufacture thereof composed of a half-cell of the fuel-cell type and of a half-cell of the primary-cell type with one metallic and one gaseous electrode
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Abstract
The present invention provides a kind of air-fuel battery anode electrode films, belong to air-fuel battery technical field.Including metal boride powder and nickel powder, the metal boride powder is titanium diboride powder, molybdenum diboride powder or power of magnesium diboride.Metal boride powder in air-fuel battery anode electrode film provided by the invention is titanium diboride powder, molybdenum diboride powder or power of magnesium diboride, expands the type for metal boride in air-fuel battery anode electrode film.
Description
Technical field
The present invention relates to air-fuel battery technical field more particularly to a kind of air-fuel battery anode electrode film and its
Preparation method, a kind of air-fuel battery.
Background technology
With petering out for non-renewable energy resources, energy problem has become the major issue that the mankind are faced.And it fires
Expect that battery as new energy technology efficiently, clean and safe, has become one of the research hotspot in new energy development field.Gold
Belong to the strong point that air cell has then given full play to fuel cell, higher than energy, simple in structure, discharging voltage balance is future
There is very much the emerging green energy resource of one kind of development and application prospect.Metal-air battery is using active metal as cathode, in air
Oxygen is reached by airwater mist cooling interface reacts with metal negative electrode by gas-diffusion electrode and is released as anode, oxygen
Electric energy.Compared with existing plumbic acid, ni-mh and lithium ion battery, metal-air battery can realize higher energy density and specific volume
Amount, and safety higher.
Last century Mo, U.S. Steven Amendola etc. propose the high energy battery using boride as electrode material
System, VB2Electronics oxidation reaction can occur in alkaline solution, theoretical discharge specific capacity is 4060mAh/g, and almost zinc is empty
5 times of pneumoelectric pond theoretical discharge specific capacity (820mAh/g), energy density are 32000Wh/L (6270Wh/kg), this is current water
The highest level of solution system metallic compound discharge performance.But boride is not contained about other kinds of in the prior art
Report as air-fuel battery anode.
Invention content
In consideration of it, the purpose of the present invention is to provide a kind of air-fuel battery anode electrode film and preparation method thereof, one
Kind air-fuel battery.The present invention provides a kind of novel air-fuel battery anode electrode film, expands for air fuel electricity
The type of metal boride in the anode electrode film of pond.
In order to achieve the above-mentioned object of the invention, the present invention provides following technical scheme：
A kind of air-fuel battery anode electrode film, including metal boride powder and nickel powder, the metal boride powder
End is titanium diboride powder, molybdenum diboride powder or power of magnesium diboride.
Preferably, the grain size of the metal boride powder is 325~400 mesh.
Preferably, the grain size of the nickel powder is 325~400 mesh.
Preferably, the molar ratio of the metal boride powder and nickel powder is 1.8~2.6:1.
The present invention also provides the preparation methods of air-fuel battery anode electrode film described in above-mentioned technical proposal, including with
Lower step：
It is suppressed after metal boride powder and nickel powder are mixed, obtains sheeted product；
The sheeted product is sintered, air-fuel battery anode electrode film is obtained.
Preferably, the sheeted product is circle, a diameter of 15mm of the sheeted product, the thickness of the sheeted product
For 1.0~1.5mm.
Preferably, the temperature of the sintering is 900~1000 DEG C, and the time of the sintering is 2~3h.
Preferably, the heating rate for being warming up to the sintering temperature is 5~10 DEG C/min.
A kind of air-fuel battery, including the air-fuel battery anode electrode film described in above-mentioned technical proposal or above-mentioned system
Air-fuel battery anode electrode film, cathode and electrolyte made from Preparation Method；The cathode includes air diffusion layer, collector
And Catalytic Layer, the electrolyte are potassium hydroxide aqueous solution.
It is described the present invention provides a kind of air-fuel battery anode electrode film, including metal boride powder and nickel powder
Metal boride powder is titanium diboride powder, molybdenum diboride powder or power of magnesium diboride.Air fuel provided by the invention
Metal boride powder in cell anode electrodes piece is titanium diboride powder, molybdenum diboride powder or power of magnesium diboride, is expanded
The big type for metal boride in air-fuel battery anode electrode film.And air-fuel battery sun provided by the invention
Pole electrode slice has loose and porous structure, is conducive to metal boride powder and is come into full contact with electrolyte, to improve
Electrode utilization rate, MoB2The MoB generated after oxidation3It is dissolved in electrolyte, to be contacted with electrolyte to molybdenum diboride powder
It causes to hinder；TiB2Electrode is led to due to the strong polarization that electrode discharges under high current density with high discharge voltage
Efficiency reduces with the increase of discharge current；MgB2Electrode efficiency first rise with the increase of current density and reduce afterwards.Embodiment
Statistics indicate that, air-fuel battery anode electrode film provided by the invention use molybdenum diboride powder when, with 20mAcm-2's
When current density is discharged, it is 2192.2mAhg that can obtain maximum capacity density-1, anode efficiency 80.14%；
When using titanium diboride powder, with 2.5mAcm-2Current density when being discharged, can obtain maximum capacity density is
2055.2mA·h·g-1, anode efficiency 53.28%, power density 2.153mWcm-2；When using power of magnesium diboride,
With 15mAcm-2Current density when being discharged, it is 3116.4mAhg that can obtain maximum capacity density-1, anode
Efficiency is 66.31%, power density 10.14mWcm-2。
Description of the drawings
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 is the polarization curve of 1 air-fuel battery anode electrode film of the embodiment of the present invention；
Fig. 2 is 1 battery of the embodiment of the present invention in 2.5mAcm-2Constant-current discharge test curve under current density；
Fig. 3 is 1 battery of the embodiment of the present invention in 5mAcm-2Constant-current discharge test curve under current density；
Fig. 4 is 1 battery of the embodiment of the present invention in 10mAcm-2Constant-current discharge test curve under current density；
Fig. 5 is 1 battery of the embodiment of the present invention in 15mAcm-2Constant-current discharge test curve under current density；
Fig. 6 is 1 battery of the embodiment of the present invention in 20mAcm-2Constant-current discharge test curve under current density；
Fig. 7 is 1 battery of the embodiment of the present invention in 25mAcm-2Constant-current discharge test curve under current density；
Fig. 8 is 1 Cell current density of the embodiment of the present invention-capacity density curve；
Fig. 9 is the polarization curve of 2 air-fuel battery anode electrode film of the embodiment of the present invention；
Figure 10 is 2 battery of the embodiment of the present invention in 2.5mAcm-2Constant-current discharge test curve under current density；
Figure 11 is 2 battery of the embodiment of the present invention in 5mAcm-2Constant-current discharge test curve under current density；
Figure 12 is 2 battery of the embodiment of the present invention in 10mAcm-2Constant-current discharge test curve under current density；
Figure 13 is 2 battery of the embodiment of the present invention in 15mAcm-2Constant-current discharge test curve under current density；
Figure 14 is 2 battery of the embodiment of the present invention in 20mAcm-2Constant-current discharge test curve under current density；
Figure 15 is 2 battery of the embodiment of the present invention in 25mAcm-2Constant-current discharge test curve under current density；
Figure 16 is 2 Cell current densities of the embodiment of the present invention-capacity density curve；
Figure 17 is the polarization curve of 3 air-fuel battery anode electrode film of the embodiment of the present invention；
Figure 18 is 3 battery of the embodiment of the present invention in 2.5mAcm-2Constant-current discharge test curve under current density；
Figure 19 is 3 battery of the embodiment of the present invention in 5mAcm-2Constant-current discharge test curve under current density；
Figure 20 is 3 battery of the embodiment of the present invention in 10mAcm-2Constant-current discharge test curve under current density；
Figure 21 is 3 battery of the embodiment of the present invention in 15mAcm-2Constant-current discharge test curve under current density；
Figure 22 is 3 battery of the embodiment of the present invention in 20mAcm-2Constant-current discharge test curve under current density；
Figure 23 is 3 battery of the embodiment of the present invention in 25mAcm-2Constant-current discharge test curve under current density；
Figure 24 is 3 Cell current densities of the embodiment of the present invention-capacity density curve.
Specific implementation mode
It is described the present invention provides a kind of air-fuel battery anode electrode film, including metal boride powder and nickel powder
Metal boride powder is titanium diboride powder, molybdenum diboride powder or power of magnesium diboride.
In the present invention, the grain size of the metal boride powder is preferably 325~400 mesh.
In the present invention, the grain size of the nickel powder is preferably 325~400 mesh.
The present invention does not have special restriction to the source of the metal boride powder and nickel powder, using art technology
Commercial goods known to personnel.
In the present invention, the molar ratio of the metal boride powder and nickel powder is preferably 1.8~2.6：1.
The present invention also provides the preparation methods of air-fuel battery anode electrode film described in above-mentioned technical proposal, including with
Lower step：
It is suppressed after metal boride powder and nickel powder are mixed, obtains sheeted product；
The sheeted product is sintered, air-fuel battery anode electrode film is obtained.
The present invention suppresses after mixing metal boride powder and nickel powder, obtains sheeted product.
The present invention does not have the hybrid mode special restriction, is using hybrid mode well known to those skilled in the art
Can, specifically, as ground.
In the present invention, the sheeted product is preferably circular, and the diameter of the sheeted product is preferably 15mm, the pressure
The thickness of material processed is preferably 1.0~1.5mm.In the present invention, the compacting carries out preferably in tablet press machine.
After obtaining sheeted product, the sheeted product is sintered by the present invention, obtains air-fuel battery anode electrode
Piece.In the present invention, the temperature of the sintering is preferably 900~1000 DEG C, and the time of the sintering is preferably 2~3h, more excellent
It is selected as 2.5h.In the present invention, the sintering can improve the hardness of electrode slice.
In the present invention, the heating rate for being warming up to the temperature of the sintering is preferably 5~10 DEG C/min, more preferably 5
~8 DEG C/min.In the present invention, the sintering carries out preferably in tube furnace.In the present invention, the sintering is preferably in argon gas
It is carried out under the protection of atmosphere.
The present invention also provides air-fuel battery anode electrode film answering in air cell described in above-mentioned technical proposal
With.
The present invention provides a kind of air-fuel batteries, including the air-fuel battery anode electricity described in above-mentioned technical proposal
Pole piece, cathode and electrolyte；The cathode includes air diffusion layer, collector and Catalytic Layer, and the electrolyte is potassium hydroxide
Aqueous solution.
In the present invention, the air diffusion layer preferably includes PTFE and activated carbon, and the collector is preferably nickel screen, institute
It is preferably MnO to state catalyst2.In the present invention, the cathode is preferably commercially available electrode.
In the present invention, the concentration of the potassium hydroxide aqueous solution is preferably 6mol/L.
The present invention does not have the preparation method of the air-fuel battery special restriction, ripe using those skilled in the art
The preparation method for the air-fuel battery known.
With reference to embodiment to air-fuel battery anode electrode film provided by the invention and its preparation method and application
It is described in detail with a kind of air-fuel battery, but they cannot be interpreted as limiting the scope of the present invention.
Embodiment 1
MoB2Powder (325 mesh) and nickel powder (400 mesh) in molar ratio 1.8：1 ratio mixing, after mixed grinding is uniform
It is pressed into diameter 15mm, the disk of thick 1.5mm with tablet press machine.
The disk suppressed is positioned in tube furnace, with 5 DEG C of heating rate be heated to 900 DEG C be sintered 2 hours, entirely
Sintering process carries out under the protection of argon atmosphere, obtains air-fuel battery anode electrode film.
Electro-chemical test is carried out to electrode slice using the three-electrode system of standard, main content of testing is that potentiodynamic polarization is bent
Line (Tafel).Using air-fuel battery anode electrode film prepared by embodiment 1 as the working electrode (face with electrolyte contacts
Product is 1cm2), it is platinum electrode (area 20mm × 20mm) to electrode, reference electrode is Hg/HgO electrodes, electrolyte 6mol/L
KOH solution.For electrolytic cell system after 0.5h, the open-circuit voltage (OCP) of electrode slice reaches stable state, Tafel be
0.5mV·s-1Sweep speed under tested in the range of -1.0V~+1.5V relative to OCP.Use the U.S.
3000 electrochemical workstations of Reference of Gamry companies, the results are shown in Figure 1, and as seen from Figure 1, corrosion current is
2.69×10-3A·cm-2, corresponding corrosion potentials are -0.964V.
Battery performance test is tested using mold battery, and the LANHE CT2001A types of Wuhan Land companies are used
Battery charging and discharging tester, battery include three parts：Anode, electrolyte and cathode.Anode is air combustion prepared by embodiment 1
Expect that cell anode electrodes piece, electrolyte are similarly the KOH solution of 6mol/L, cathode is commercially available electrode, including air diffusion layer,
Collector and Catalytic Layer.Air diffusion layer main component is PTFE and activated carbon, and collector is nickel screen, catalyst MnO2.Electricity
Pond test is tested using the constant-current discharge under different current densities, and discharge current density is followed successively by：2.5mA·cm-2,
5mA·cm-2, 10mAcm-2, 15mAcm-2, 20mAcm-2, 25mAcm-2, for testing battery in low current long-time
The performance of short-term high power discharge under continuous discharge and high current.Discharge capacity is 100mAh, blanking voltage 0.3V, test knot
Fruit is respectively as shown in Fig. 2~7.Fig. 2 is with 2.5mAcm-2The experimental result discharged of current density, can be seen by Fig. 2
Go out, the electric discharge mean pressure of battery is 0.6638V, capacity density 1953.1mAhg-1, electrode efficiency 71.40%, power
Density is 1.66mWcm-2.Fig. 3 is with 5mAcm-2The experimental result discharged of current density, as seen from Figure 3,
The electric discharge mean pressure of battery is 0.6433V, capacity density 1981.7mAhg-1, electrode efficiency 72.44%, power is close
Degree is 3.217mWcm-2.Fig. 4 is with 10mAcm-2The experimental result discharged of current density, as seen from Figure 4,
The electric discharge mean pressure of battery is 0.5766V, capacity density 2008.8mAhg-1, electrode efficiency 73.43%, power is close
Degree is 5.766mWcm-2.Fig. 5 is with 15mAcm-2The experimental result discharged of current density, as seen from Figure 5,
The electric discharge mean pressure of battery is 0.5323V, capacity density 2079.0mAhg-1, electrode efficiency 76.00%, power is close
Degree is 7.985mWcm-2.Fig. 6 is with 20mAcm-2The experimental result discharged of current density, as seen from Figure 6,
The electric discharge mean pressure of battery is 0.5096V, capacity density 2192.2mAhg-1, electrode efficiency 80.14%, power is close
Degree is 10.192mWcm-2.Fig. 7 is with 25mAcm-2The experimental result discharged of current density, can be seen by Fig. 7
Go out, the electric discharge mean pressure of battery is 0.4972V, capacity density 2123.1mAhg-1, electrode efficiency 77.61%, power
Density is 12.43mWcm-2。
Current density-capacity density of the battery is measured, structure is as shown in figure 8, as seen from Figure 8, battery
With 20mAcm-2Current density when being discharged, it is 2192.2mAhg that can obtain maximum capacity density-1,
Anode efficiency is 80.14%.
Embodiment 2
TiB2Powder (400 mesh) and nickel powder (325 mesh) in molar ratio 2.5：1 ratio mixing, after mixed grinding is uniform
It is pressed into diameter 15mm, the disk of thick 1.0mm with tablet press machine.
The disk suppressed is positioned in tube furnace, being heated to 1000 DEG C with 5 DEG C of heating rate is sintered 3 hours, whole
A sintering process carries out under the protection of argon atmosphere, obtains air-fuel battery anode electrode film.
Electro-chemical test is carried out using four kinds of electrode slices of three-electrode system pair of standard, main content of testing is electrokinetic potential pole
Change curve (Tafel).Using air-fuel battery anode electrode film as working electrode, (area with electrolyte contacts is 1cm2),
It is platinum electrode (area 20mm × 20mm) to electrode, reference electrode is Hg/HgO electrodes, and electrolyte is the KOH solution of 6mol/L.
Electrolytic cell system is after 0.5h, and the open-circuit voltage (OCP) of electrode slice reaches stable state, and Tafel is in 0.5mVs-1Scanning
It is tested in the range of -1.0V~+1.5V relative to OCP under rate.Use Gamry companies of the U.S.
Reference3000 electrochemical workstations, the results are shown in Figure 9, and as seen from Figure 9, corrosion current is 2.29 × 10-2A·
cm-2, corresponding corrosion potentials are -1.080V.
Battery performance test is tested using mold battery, and the LANHE CT2001A types of Wuhan Land companies are used
Battery charging and discharging tester, battery include three parts：Anode, electrolyte and cathode.Anode is exactly empty made from the present embodiment
Gas fuel cell anode electrodes piece, electrolyte are similarly the KOH solution of 6mol/L, and cathode is commercially available electrode, including air expansion
Dissipate layer, collector and Catalytic Layer.Air diffusion layer main component is PTFE and activated carbon, and collector is nickel screen, and catalyst is
MnO2.Battery testing is tested using the constant-current discharge under different current densities, and discharge current density is followed successively by：
2.5mA·cm-2, 5mAcm-2, 10mAcm-2, 15mAcm-2, 20mAcm-2, 25mAcm-2, exist for testing battery
Performance of the low current long lasting for short-term high power discharge under electric discharge and high current.Discharge capacity is 100mAh, blanking voltage
For 0.3V, for test result respectively as shown in Figure 10~16, Figure 10 is with 2.5mAcm-2The experiment discharged of current density
As a result, as seen from Figure 10, there are two discharge platforms in the discharge curve of battery, and first platform voltage is about 0.98V,
And the voltage of second discharge platform is about 0.85V, the electric discharge mean pressure of battery is 0.8610V, and capacity density is
2055.2mA·h·g-1, electrode efficiency 53.28%, power density 2.153mWcm-2.Figure 11 is with 5mAcm-2's
There are two discharge platforms in the experimental result that current density is discharged, as seen from Figure 11, the discharge curve of battery, the
One platform voltage is about 0.96V, and the voltage of second discharge platform is about 0.75V, and the electric discharge mean pressure of battery is
0.7807V, capacity density 1906.7mAhg-1, electrode efficiency 49.43%, power density 3.904mWcm-2。
Figure 12 is with 10mAcm-2The experimental result discharged of current density, as seen from Figure 12, the discharge curve of battery goes out
A discharge platform is showed, the electric discharge mean pressure of battery is 0.9211V, capacity density 1711.1mAhg-1, electrode efficiency
It is 44.36%, power density 9.211mWcm-2.Figure 13 is with 15mAcm-2The experiment knot that discharges of current density
There is a discharge platform in fruit, as seen from Figure 13, the discharge curve of battery, and the electric discharge mean pressure of battery is 0.8498V,
Capacity density is 1582.3mAhg-1, electrode efficiency 41.02%, power density 12.747mWcm-2.Figure 14 be with
20mA·cm-2The experimental result discharged of current density, as seen from Figure 14, the discharge curve of battery occurs one
The electric discharge mean pressure of discharge platform, battery is 0.7805V, capacity density 1135.6mAhg-1, electrode efficiency is
29.44%, power density 15.61mWcm-2.Figure 15 is with 25mAcm-2The experiment knot that discharges of current density
There is a discharge platform in fruit, as seen from Figure 15, the discharge curve of battery, and the electric discharge mean pressure of battery is 0.7717V,
Capacity density is 781.79mAhg-1, electrode efficiency 20.27%, power density 19.293mWcm-2。
It is as shown in figure 16 to current density-capacity density of the battery, as seen from Figure 16, battery 2.5~
25mA·cm-2Current density range in when being discharged, capacity density reduces with the increase of current density.And battery exists
Low current density (2.5,5mAcm-2) under when being discharged, there is two platforms, and the ratio between the electricity of two platforms in voltage
About 3：7, and with larger current density (10,15,20,25mAcm-2) when being discharged, it is flat only to there is a voltage
Platform.Two voltage platforms may be related with the reaction mechanism occurred when battery discharge, the oxidation reaction that anode is occurred when electric discharge
It is divided into the progress of two steps, specific discharge mechanism also needs further to study.And in high current density discharge, it may be possible to due to big
Strong polarization under electric current causes reaction mechanism to change, to a voltage platform only occur.
Embodiment 3
MgB2Powder (350 mesh) and nickel powder (450 mesh) in molar ratio 2.45：1 ratio mixing, after mixed grinding is uniform
It is pressed into diameter 15mm, the disk of thick 1.0mm with tablet press machine.
The disk suppressed is positioned in tube furnace, with 6 DEG C of heating rate be heated to 900 DEG C be sintered 2 hours, entirely
Sintering process carries out under the protection of argon atmosphere, obtains air-fuel battery anode electrode film.
Electro-chemical test is carried out using four kinds of electrode slices of three-electrode system pair of standard, main content of testing is electrokinetic potential pole
Change curve (Tafel).Using air-fuel battery anode electrode film as working electrode, (area with electrolyte contacts is 1cm2),
It is platinum electrode (area 20mm × 20mm) to electrode, reference electrode is Hg/HgO electrodes, and electrolyte is the KOH solution of 6mol/L.
Electrolytic cell system is after 0.5h, and the open-circuit voltage (OCP) of electrode slice reaches stable state, and Tafel is in 0.5mVs-1Scanning
It is tested in the range of -1.0V~+1.5V relative to OCP under rate.Use Gamry companies of the U.S.
Reference3000 electrochemical workstations, as a result as shown in figure 17, as seen from Figure 17, corrosion current is 1.01 × 10- 2A·cm-2, corresponding corrosion potentials are -0.964V.
Battery performance test is tested using mold battery, and the LANHE CT2001A types of Wuhan Land companies are used
Battery charging and discharging tester, battery include three parts：Anode, electrolyte and cathode.Anode is exactly the metal boron to be studied
Compound electrode slice, electrolyte are similarly the KOH solution of 6mol/L, and cathode is commercially available electrode, including air diffusion layer, collector
And Catalytic Layer.Air diffusion layer main component is PTFE and activated carbon, and collector is nickel screen, catalyst MnO2.Battery testing
Using the constant-current discharge test under different current densities, discharge current density is followed successively by：2.5mA·cm-2, 5mAcm-2, 10mAcm-2, 15mAcm-2, 20mAcm-2, 25mAcm-2, for testing battery in low current long lasting for putting
The performance of short-term high power discharge under electricity and high current.Discharge capacity is 100mAh, blanking voltage 0.3V, test result difference
As shown in Figure 18~24, Figure 18 is with 2.5mAcm-2The experimental result discharged of current density, as seen from Figure 18,
There are two discharge platforms in the discharge curve of battery, and first platform voltage is about 0.88V, and the electricity of second discharge platform
Pressure is about 0.78V, and the electric discharge mean pressure of battery is 0.7918V, capacity density 1183.2mAhg-1, electrode efficiency is
25.18%, power density 1.980mWcm-2.Figure 19 is with 5mAcm-2The experimental result discharged of current density,
As seen from Figure 19, there are two discharge platforms in the discharge curve of battery, and first platform voltage is about 0.87V, and the
The voltage of two discharge platforms is about 0.76V, and the electric discharge mean pressure of battery is 0.7633V, capacity density 1763.5mAh
g-1, electrode efficiency 37.52%, power density 3.817mWcm-2.Figure 20 is with 10mAcm-2Current density carry out
There is two discharge platforms, first platform voltage in the experimental result of electric discharge, as seen from Figure 20, the discharge curve of battery
About 0.83V, and the voltage of second discharge platform is about 0.68V, the electric discharge mean pressure of battery is 0.6902V, capacity density
For 2437.6mAhg-1, electrode efficiency 51.87%, power density 6.902mWcm-2.Figure 21 is with 15mAcm-2
The experimental result discharged of current density, as seen from Figure 21, there are two discharge platforms in the discharge curve of battery,
First platform voltage is about 0.78V, and the voltage of second discharge platform is about 0.76V, and the electric discharge mean pressure of battery is
0.6760V, capacity density 3116.4mAhg-1, electrode efficiency 66.31%, power density 10.14mWcm-2。
Figure 22 is with 20mAcm-2The experimental result discharged of current density, as seen from Figure 22, the discharge curve of battery goes out
Two discharge platforms are showed, first platform voltage is about 0.75V, and the voltage of second discharge platform is about 0.60V, battery
Electric discharge mean pressure be 0.6229V, capacity density 2736.0mAhg-1, electrode efficiency 58.22%, power density is
12.458mW·cm-2.Figure 23 is with 25mAcm-2The experimental result discharged of current density, as seen from Figure 23,
There are two discharge platforms in the discharge curve of battery, and first platform voltage is about 0.72V, and the electricity of second discharge platform
Pressure is about 0.58V, and the electric discharge mean pressure of battery is 0.5962V, capacity density 2649.3mAhg-1, electrode efficiency is
56.37%, power density 17.905mWcm-2。
It is as shown in figure 24 to current density-capacity density of the battery, as seen from Figure 24, battery 2.5~
25mA·cm-2Current density range in when being discharged, capacity density first rises with the increase of current density and declines afterwards, in electricity
Current density is 15mAcm-2When reach maximum, be 3116.4mAhg-1.It is flat that the battery two voltages occurs in electric discharge
Platform, and the ratio between electricity of two platforms is about 3：17.
Higher electrode efficiency, which has benefited from the electrode slice made from powder, has loose and porous structure, this is conducive to active matter
Matter is come into full contact with electrolyte, to improve electrode utilization rate, and MoB2The MoB generated after oxidation3It is dissolved in electrolysis
Matter, so that contact that will not be to active material with electrolyte causes to hinder.TiB2With highest discharge voltage, but due to electrode
The strong polarization discharged under high current density, causes electrode efficiency to reduce with the increase of discharge current, MgB2Electrode
Efficiency is different with the situation of change that current density changes, and electrode efficiency first rises with the increase of current density to be reduced afterwards.And
The electrode efficiency of the two is relatively low, this may be because since reaction generates TiO2And MgO, both oxides are not due to
It is dissolved in electrolyte (KOH) and be attached on anode leads to electrode to hinder further contacting for active material and electrolyte
The rate of the corrosion side reaction occurred between utilization rate decline and electrode slice and electrolyte is greater than VB2And MoB2, this with by
The conclusion obtained in polarization curve is consistent.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (9)
1. a kind of air-fuel battery anode electrode film, including metal boride powder and nickel powder, the metal boride powder
For titanium diboride powder, molybdenum diboride powder or power of magnesium diboride.
2. air-fuel battery anode electrode film according to claim 1, which is characterized in that the metal boride powder
Grain size be 325~400 mesh.
3. air-fuel battery anode electrode film according to claim 1 or 2, which is characterized in that the grain size of the nickel powder
For 325~400 mesh.
4. air-fuel battery anode electrode film according to claim 1, which is characterized in that the metal boride powder
Molar ratio with nickel powder is 1.8~2.6:1.
5. the preparation method of air-fuel battery anode electrode film, includes the following steps described in Claims 1 to 4 any one：
It is suppressed after metal boride powder and nickel powder are mixed, obtains sheeted product；
The sheeted product is sintered, air-fuel battery anode electrode film is obtained.
6. preparation method according to claim 5, which is characterized in that the sheeted product is circle, the sheeted product
A diameter of 15mm, the thickness of the sheeted product is 1.0~1.5mm.
7. preparation method according to claim 5, which is characterized in that the temperature of the sintering is 900~1000 DEG C, described
The time of sintering is 2~3h.
8. preparation method according to claim 7, which is characterized in that the heating rate for being warming up to the sintering temperature is 5
~10 DEG C/min.
A kind of air-fuel battery anode electrode film 9. air-fuel battery, including described in Claims 1 to 4 any one or
Air-fuel battery anode electrode film, cathode and electrolyte made from preparation method described in claim 5~8 any one；Institute
It includes air diffusion layer, collector and Catalytic Layer to state cathode, and the electrolyte is potassium hydroxide aqueous solution.
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Cited By (1)
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| CN114023975A (en) * | 2021-11-08 | 2022-02-08 | 易航时代(北京)科技有限公司 | Magnesium diboride air fuel cell anode electrode plate and application thereof, and air fuel cell |
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