CN106848256B - A kind of nickel iron cell core duplex shell structure cathode nano material and its preparation method and application - Google Patents
A kind of nickel iron cell core duplex shell structure cathode nano material and its preparation method and application Download PDFInfo
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Abstract
The invention discloses a kind of nickel iron cell core duplex shell structure (Fe-Ni@Fe3O4@C) cathode nano material and its preparation method and application.Source of iron, nickel source and organic complexing agent are added separately to dissolve in organic solvent, stirring, heating are evaporated to obtain presoma after mixing, obtain target material through high temperature sintering in protective atmosphere later.Resulting materials are the Fe-Ni@Fe of core duplex shell structure3O4@C and specific surface area with higher.Fe-Ni@Fe3O4@C has high specific discharge capacity and excellent stable circulation performance as nickel iron cell negative electrode material.The preparation method process flow is short, easy to operate, it is easy to accomplish industrialized production.
Description
Technical field
The invention belongs to high-energy battery field of material technology, and in particular to a kind of high performance nickel with core duplex shell structure
Iron cell iron electrode cathode nano material and its preparation method and application.
Background technique
Nickel iron cell is a kind of rechargeable battery for having extensive use.In the U.S., the former Soviet Union, Sweden, German and Japan,
Nickel iron cell is sufficiently applied in all fields.It is low in cost since iron resource is abundant, environment friendly and pollution-free, ferronickel in recent years
Battery causes the extensive concern of researcher.But the research of nickel iron cell is perfect not enough at present, that there are efficiency for charge-discharges is low,
Self discharge seriously with easy the problems such as being passivated, seriously constrains the performance of nickel iron cell, therefore develops novel with high performance
Iron electrode material is the important channel for improving nickel iron cell performance.
Fe3O4As a kind of transition metal oxide, have environmental-friendly, low production cost, preparation method is simple, money
Source is abundant, theoretical specific capacity height (926mAh g-1) the advantages that, have a extensive future, oneself through extensively by the concern of researcher,
The current various methods for preparing nano ferriferrous oxide are largely reported.The study found that Fe3O4Discharge capacity and circulation
The synthetic method and subsequent heat treatment process of service life and material are closely related.Researcher has carried out a large amount of doping and surface cladding
Modified research, it is intended to further increase its chemical property.Gan etc. [New Journal of Chemistry, 38
(2014), the mesoporous Fe that diameter is 500nm 2428] is successfully prepared by the hydro-thermal method of no template3O4@C sub-micro ball.The material
The cycle performance shown as lithium ion battery anode material is (in 100mA g-1Under, specific discharge capacity is after 50 circulations
930mAh g-1) and high rate performance (in 1000mA g-1Under, specific discharge capacity is 710mAh g-1).[the Journal of such as Fan
Materials Chemistry A 2 (2014), 14641] it is prepared for the carbon coating Fe with core-shell structure3O4Microballoon, carbon shell is about
5-10nm is thick.Thin layer carbon shell can be to avoid Fe3O4It is directly exposed in electrolyte, and keeps the structural stability of sphere, inhibit
Fe3O4Dusting of the particle in charge and discharge process and reunite again.Li et al. [Electrochimica Acta, 178 (2015), 34] is logical
Cross the high performance Fe of simple Co deposited synthesis3O4Applied to nickel iron cell, temperature is explored to structure and chemical property
It influences.The result shows that annealing temperature is to improve Fe3O4One key factor of chemical property.700 DEG C of heat treatments obtain a large amount of more
Face body, the sample than handling at a temperature of other show superior chemical property.Jiang etc. [RSC Advances, 30
(2014), FeO 15394] is grown on graphene film by high temperature solid state reactionxNanocomposite.Due to FeOxGraphene
Piece interaction has good electro-chemical activity and mechanical performance, which has better high rate performance in nickel iron cell
And stable circulation performance.
The present invention devises a step high temperature pyrolytic cracking (HTP), using molysite as raw material, using nickel salt as nickel source, and using citric acid as carbon source,
By being sintered to have obtained the Fe-Ni@Fe with core duplex shell structure under an inert atmosphere3O4@C composite.Compared to original
Fe3O4/ C, the reversible capacity and stable circulation performance of the composite material are all obviously improved, and can be used as a kind of high-performance
Nickel iron cell iron electrode material.
Summary of the invention
It is an object of the invention to propose a kind of high capacity and the nickel iron cell cathode composite nano materials of long-life and its
Preparation method and application.The composite nano materials structure novel, using dilval as core, from inside to outside successively respectively with four
Fe 3 O and carbon are duplex shell structure.And the reversible capacity and stable circulation performance of the composite material are compared with prior art all
It is obviously improved.Preparation method of the invention is also a kind of easy step high temperature pyrolytic cracking (HTP), and can directly generate has spy
The target material of different core duplex shell structure.The clad of the available duplex shell structure of this method, can effectively solve in the prior art
Iron electrode cathode is easily passivated and the bad problem of cycle performance.
Material of the invention is one kind using dilval as core, with ferroso-ferric oxide and carbon is respectively successively from inside to outside double
The composite nano materials of shell structure.
The preparation method of composite nano materials of the present invention, it is molten by certain mol proportion using molysite and nickel salt as raw material
Solution in organic solvent, is added complexing agent and is used as carbon source simultaneously, stir evenly, dry or be evaporated, be subsequently placed in protective atmosphere
Middle sintering processes are to get target material.
The preparation method of composite nano materials of the present invention, the source of iron are as follows: ferric nitrate, iron chloride, ferric acetate,
One of ferric sulfate and ferrous sulfate, preferably ferric nitrate, one of iron chloride；The nickel source are as follows: nickel nitrate, chlorination
Nickel, nickel acetate, one of nickel sulfate, preferably nickel nitrate, one of nickel acetate.
The preparation method of composite nano materials of the present invention, the molar ratio of the source of iron and nickel source are as follows: 10:1~
5:2, preferably 10:1~5:1.
The preparation method of composite nano materials of the present invention, the organic solvent are as follows: ethyl alcohol, propyl alcohol, ethylene glycol
One of, preferred alcohol, one of ethylene glycol.
The preparation method of composite nano materials of the present invention, the complexing agent are as follows: citric acid, in sodium citrate
It is a kind of.
The addition molar ratio of the preparation method of composite nano materials of the present invention, complexing agent and source of iron is 2-4:1,
It is preferred that 3:1.
The preparation method of composite nano materials of the present invention, the stirring rate are as follows: 400~600rpm；It is described
Drying temperature are as follows: 80~100 DEG C；The protective atmosphere are as follows: one of argon gas or nitrogen.
The preparation method of composite nano materials of the present invention, heating rate when sintering are as follows: 1~15 DEG C/min, excellent
Select 5~10 DEG C/min；Sintering temperature are as follows: 300~800 DEG C, preferably 550~700 DEG C, 0.5~6h of sintering time, preferably 2~3h.
The application of composite nano materials of the present invention is used as nickel iron cell iron electrode negative electrode material.The present invention
Principle:
The electrode passivation and liberation of hydrogen occurred during the capacity attenuation and discharge and recharge reaction of nickel iron cell iron electrode is secondary anti-
It answers closely related.The passivation of electrode surface can prevent the progress of electrochemical reaction, lead to the decaying of capacity.Because of the limit of passivating film
System, the diffusion hindered of ion in the electrodes cause high rate performance bad.It can inhibit passivating film by suitable surface modification
It is formed, the crystal structure of stabilizing material, to extend cycle life.The study found that the present invention utilizes carbon coating and nickel doping pair
Ferroso-ferric oxide is modified, and the Fe-Ni@Fe with special nucleus duplex shell structure can be obtained3O4@C composite.With do not mix
The material of nickel is compared, and the introducing of nickel source is not to play simple doping effect, and iron can interact to form alloy phase with nickel, pass through
The target material that Fe-Ni alloy/C is main phase can be obtained in regulation ratio.Fe-Ni alloy/C and Fe3O4It can act as the activity of iron electrode
The uniform carbon-coating in source, while duplex shell structure, especially outside can protect the dissolution and passivation of iron electrode, significantly improve
The interfacial electrochemistry property of combination electrode, to improve the high rate performance and stable circulation performance of electrode.Advantages of the present invention and
Good effect
The present invention has following distinguishing feature:
1): compared to other method for coating, present invention introduces nickel elements, pass through the phase interaction of ferro element and nickel element
With by forming compound, while overcoming uneven common cladding process cladding and clad and starting material is untight
Deficiency is able to achieve close uniform cladding between layers, to significantly improve the stable circulation performance of material.
2): present invention obtains a kind of target materials with unique core duplex shell structure, based on Fe-Ni alloy/C,
Fe3O4The interfacial electrochemistry property of electrode can be significantly improved with carbon bivalve layer, is followed to obtain higher reversible capacity with excellent
Ring stability.
The core duplex shell structure Fe-Ni@Fe that the present invention synthesizes3O4@C composite compares original Fe3O4@C, cycle performance
It is all significantly improved with big multiplying power discharging property.The present invention is by industrialization for the further investigation of iron electrode material and from now on
Application providing way is supported.Meanwhile the step proposed by the present invention that is heat-treated in an inert atmosphere generates core duplex shell structure Fe-Ni@
Fe3O4The thinking of@C composite will provide reference for the cladding research of other negative electrode materials.
Detailed description of the invention
Fig. 1 is respectively the XRD result of material prepared by embodiment 1, embodiment 2, embodiment 3 and embodiment 4；
Fig. 2 be respectively embodiment 1, embodiment 3 prepare target material transmission electron microscope comparison diagram.
Specific embodiment
The invention will be further described by the following examples, is not intended to limit the present invention.
Embodiment 1:(is undoped with nickel)
The citric acid for weighing 3.15g is dissolved in 35ml ethanol solution.Then 2.02g ferric nitrate is weighed to be added to
It states in solution, 30min is stirred at room temperature, then heat to 40 DEG C of constant temperature 1h, be continuously heating to 80 DEG C of stirrings and be evaporated to get presoma
Powder.It is placed in tube furnace, with 60cm3min-1Flow persistently inject argon gas protective gas, after half an hour, with 5 DEG C of min-1It rises
Warm rate is heated to 600 DEG C of constant temperature 2h.Then cooled to room temperature is to get target product.
Make iron electrode negative electrode tab using piece legal system is rolled.Active material, conductive agent acetylene black and polyfluortetraethylene of binding element
Quality proportioning is 8:1:1.Active material and acetylene black are weighed first, in accordance with aforementioned proportion.It is transferred to agate mortar after mixing
Middle dry grinding, then be added dropwise 10% polytetrafluoroethylene (PTFE) (polytetrafluoroethylene), PTFE) lotion to grind after
In mixture.PTFE and active material are ground again after mixing until forming the paste of flexible.Paste is shifted
Onto clean glass plate, is rolled with glass bar rolling and thickness is made in the thin slice of 0.2mm or so, to prevent thin slice dry and cracked, rolled
A small amount of ethyl alcohol is added dropwise during piece；It is then cut into the thin slice of 0.5cm × 0.5cm with small blade, thin slice is transferred to prior weighing
In the collector nickel foam crossed, pole piece is pressed into tablet press machine；In the dry 6h of 60 DEG C of vacuum environments, cathode pole piece is obtained.By iron
Cathode pole piece and business sintrered nickel anode pole piece positive and negative anodes are relatively fixed injects in organic glass electrolytic cell, then into electrolytic cell
A certain amount of electrolyte carries out the test of charge and discharge cycles stability on new prestige tester.
Fe is had recorded in table 23O4The specific surface area data of/C, its specific surface area are 47.2m2g-1.Fig. 1 has recorded
Fe3O4The XRD diagram of/C, it can be seen that main object is mutually Fe3O4, crystallinity is preferable.Fig. 2 a has recorded Fe3O4The TEM of/C schemes,
Fe3O4The structure that/C is in granular form.Fig. 2 b has recorded Fe3O4The HRTEM of/C schemes.From high-resolution transmission plot, it can be observed that bright
Aobvious correspondence Fe3O4Lattice fringe.Table 1 records the battery in 1Ag-1Second under current density, which encloses reversible capacity, is
200.6mAh g-1, 50 times circulation after capacity be 166.2mAh g-1, 100 times circulation after capacity 129.1mAh g-1。
Embodiment 2
The citric acid for weighing 3.15g is dissolved in 35ml ethanol solution.Then 2.02g ferric nitrate and 0.15g are weighed
Nickel nitrate is added in above-mentioned solution, and 30min is stirred at room temperature, and then heats to 40 DEG C of constant temperature 1h, is continuously heating to 80 DEG C of stirrings
It is evaporated to get precursor powder.It is placed in tube furnace, with 60cm3min-1Flow persistently inject argon gas protective gas, half an hour
Afterwards, with 5 DEG C of min-1Heating rate is heated to 600 DEG C of constant temperature 2h.Then cooled to room temperature is to get target product.
Fabrication Technology of Electrode and battery performance test are the same as embodiment 1.Table 2 has recorded the specific surface product of product
According to its specific surface area is 51.2m2g-1, than embodiment 1 (nickel source is not added) than it is slightly bigger.Sample is had recorded in Fig. 1
XRD curve, it can be seen that main object is mutually Fe3O4And Fe-Ni alloy/C, crystallinity are preferable.Table 1 records the battery in 1Ag-1Electric current
The second circle reversible capacity under density is 296.9mAh g-1, 50 times circulation after capacity be 230.1mAh g-1, after 100 times recycle
Capacity 196.4mAh g-1。
Embodiment 3
The citric acid for weighing 3.15g is dissolved in 35ml ethanol solution.Then 2.02g ferric nitrate and 0.29g are weighed
Nickel nitrate is added in above-mentioned solution, and 30min is stirred at room temperature, and then heats to 40 DEG C of constant temperature 1h, is continuously heating to 80 DEG C of stirrings
It is evaporated to get precursor powder.It is placed in tube furnace, with 60cm3min-1Flow persistently inject argon gas protective gas, half an hour
Afterwards, with 5 DEG C of min-1Heating rate is heated to 600 DEG C of constant temperature 2h.Then cooled to room temperature is to get target product.
Fabrication Technology of Electrode and battery performance test are the same as embodiment 1.The specific surface of gained sample is had recorded in table 2
Volume data, its specific surface area are 52.8m2g-1, equally larger than the sample in embodiment 1 and embodiment 2.Fig. 1 has recorded
The XRD diagram of gained sample, it can be seen that main object is mutually Fe3O4And Fe-Ni alloy/C, crystallinity is preferable, occurs without obvious carbon peak
(reason may be that calcination temperature is lower, and degree of graphitization is lower, can not show in XRD diagram).It is worth noting that, compared to implementing
Example 2, with the increase of nickel source content, the XRD diffraction peak intensity of Fe-Ni alloy/C is significantly increased, and illustrates that object Phase Proportion increases.Fig. 2 c
Have recorded the TEM figure of product.Nano particle and carbon-coating are closely combined together, and the outer layer without obvious lattice fringe is without fixed
The carbon of shape is evenly coated at the outside of particle.Fig. 2 d has recorded the HRTEM figure of product.It can be clearly seen that double-nucleocapsid structure,
Outermost to be amorphous carbon-coating, thickness is about 5nm, and the corresponding lattice of intermediate 0.25nm is Fe3O4, and innermost layer
The corresponding lattice of 0.207nm is Fe-Ni alloy/C.Table 1 records the battery in 1Ag-1The second circle reversible capacity under current density
For 338.4mAh g-1, 50 times circulation after capacity be 317.3mAh g-1, 100 times circulation after capacity 312.6mAh g-1.Capacity with
Stable circulation performance will be better than embodiment 1 and embodiment 2, illustrate the Fe-Ni@of core duplex shell structure manufactured in the present embodiment
Fe3O4@C-material has more preferably chemical property.
Embodiment 4
The citric acid for weighing 3.15g is dissolved in 35ml ethanol solution.Then 2.02g ferric nitrate and 0.58g are weighed
Nickel nitrate is added in above-mentioned solution, and 30min is stirred at room temperature, and then heats to 40 DEG C of constant temperature 1h, is continuously heating to 80 DEG C of stirrings
It is evaporated to get precursor powder.It is placed in tube furnace, with 60cm3min-1Flow persistently inject argon gas protective gas, half an hour
Afterwards, with 5 DEG C of min-1Heating rate is heated to 600 DEG C of constant temperature 2h.Then cooled to room temperature is to get target product.
Fabrication Technology of Electrode and battery performance test are the same as embodiment 1.The specific surface of gained sample is had recorded in table 2
Volume data, its specific surface area are 50.5m2g-1.Fig. 1 has recorded the XRD diagram of gained sample, it can be seen that mainly object is mutually mainly
Fe3O4And Fe-Ni alloy/C, crystallinity is preferable, and the object Phase Proportion of Fe-Ni alloy/C further increases.The battery is recorded in table 1 to exist
1Ag-1The second circle reversible capacity under current density is 373.5mAh g-1, 50 times circulation after capacity be 272.4mAh g-1, 100
Capacity 260.1mAh g after secondary circulation-1Although reversible capacity increases with the increase of nickel content, cycle performance but drops
It is low.
Embodiment 5
The sodium citrate for weighing 4.4g is dissolved in 35ml ethanol solution.Then 1.35g iron chloride and 0.25g are weighed
Nickel acetate is added in above-mentioned solution, and 30min is stirred at room temperature, and then heats to 40 DEG C of constant temperature 1h, is continuously heating to 80 DEG C of stirrings
It is evaporated to get precursor powder.It is placed in tube furnace, with 60cm3min-1Flow persistently inject nitrogen protection gas, half an hour
Afterwards, with 10 DEG C of min-1Heating rate is heated to 700 DEG C of constant temperature 3h.Then cooled to room temperature is to get target product.
Fabrication Technology of Electrode and battery performance test are the same as embodiment 1.The specific surface of gained sample is had recorded in table 2
Volume data, its specific surface area are 46.4m2g-1.The battery is recorded in table 1 in 1Ag-1The second circle reversible capacity under current density
For 378.2mAh g-1, 50 times circulation after capacity be 303.1mAh g-1, 100 times circulation after capacity 251.3mAh g-1, with implementation
Example 3 is compared, and although reversible capacity has increase, but stable circulation performance but reduces.
Embodiment 6
The citric acid for weighing 2.1g is dissolved in 35ml ethylene glycol solution.Then 2.02g ferric nitrate and 0.29g nitric acid are weighed
Nickel is added in above-mentioned solution, and 30min is stirred at room temperature, and then heats to 40 DEG C of constant temperature 1h, is continuously heating to 100 DEG C of stirrings and is steamed
It does to get precursor powder.It is placed in tube furnace, with 60cm3min-1Flow persistently inject argon gas protective gas, half an hour
Afterwards, with 8 DEG C of min-1Heating rate is heated to 650 DEG C of constant temperature 3h.Then cooled to room temperature is to get target product.
Fabrication Technology of Electrode and battery performance test are the same as embodiment 1.The specific surface of gained sample is had recorded in table 2
Volume data, its specific surface area are 52.3m2g-1.The battery is recorded in table 1 in 1Ag-1The second circle reversible capacity under current density
For 309.1mAh g-1, 50 times circulation after capacity be 251.5mAh g-1, 100 times circulation after capacity 232.7mAh g-1, with implementation
Example 3 is compared, and reversible capacity and cyclical stability are all declined.
Embodiment 7
The citric acid for weighing 3.15g is dissolved in 35ml propanol solution.Then 2.02g ferric nitrate and 0.29g nitric acid are weighed
Nickel is added in above-mentioned solution, and 30min is stirred at room temperature, and then heats to 40 DEG C of constant temperature 1h, is continuously heating to 100 DEG C of stirrings and is steamed
It does to get precursor powder.It is placed in tube furnace, with 60cm3min-1Flow persistently inject argon gas protective gas, half an hour
Afterwards, with 5 DEG C of min-1Heating rate is heated to 700 DEG C of constant temperature 3h.Then cooled to room temperature is to get target product.
Fabrication Technology of Electrode and battery performance test are the same as embodiment 1.The specific surface of gained sample is had recorded in table 2
Volume data, its specific surface area are 48.7m2g-1.The battery is recorded in table 1 in 1Ag-1The second circle reversible capacity under current density
For 281.3mAh g-1, 50 times circulation after capacity be 231.4mAh g-1, 100 times circulation after capacity 214.2mAh g-1, with implementation
Example 2 is compared, and early period, solvent had a certain impact to the formation of presoma, and in addition calcination temperature is higher, and what active material was reunited gets over
Severity is unfavorable for the utilization of active material, reduces reversible capacity, and cyclical stability is affected.
Embodiment 8
The sodium citrate for weighing 4.4g is dissolved in 35ml ethanol solution.Then 2.02g iron chloride and 0.29g are weighed
Nickel chloride is added in above-mentioned solution, and 30min is stirred at room temperature, and then heats to 40 DEG C of constant temperature 1h, is continuously heating to 80 DEG C of stirrings
It is evaporated to get precursor powder.It is placed in tube furnace, with 60cm3min-1Flow persistently inject argon gas protective gas, half an hour
Afterwards, with 6 DEG C of min-1Heating rate is heated to 550 DEG C of constant temperature 2h.Then cooled to room temperature is to get target product.
Fabrication Technology of Electrode and battery performance test are the same as embodiment 1.The specific surface of gained sample is had recorded in table 2
Volume data, its specific surface area are 49.1m2g-1.The battery is recorded in table 1 in 1Ag-1The second circle reversible capacity under current density
For 302.5mAh g-1, 50 times circulation after capacity be 232.6mAh g-1, 100 times circulation after capacity 203.1mAh g-1, with implementation
Example 2 compares, and specific surface area is smaller.The result shows that the selection of source of iron and nickel source is not very big on last experimental result influence.Calcining
Temperature has an impact to the chemical property of material, and calcination temperature is lower, and the degree of graphitization of carbon is lower, and electric conductivity is poor.
Table 1 is respectively embodiment 1, embodiment 2, embodiment 3, embodiment 4, embodiment 5, embodiment 6, embodiment 7, implements
The circulating and reversible capacity data of 8 sample of example.
Table 2 is respectively embodiment 1, embodiment 2, embodiment 3, embodiment 4, embodiment 5, embodiment 6, embodiment 7, implements
The specific surface area data of 8 sample of example.
Table 1
Table 2
Claims (15)
1. one kind is using dilval as core, from inside to outside successively respectively using ferroso-ferric oxide and carbon as the composite Nano of duplex shell structure
Material.
2. the preparation method of composite nano materials described in claim 1, which is characterized in that using molysite and nickel salt as raw material, press
Certain mol proportion dissolves in organic solvent, and complexing agent is added and is used as carbon source simultaneously, stirs evenly, dries or be evaporated, then
Sintering processes are placed in protective atmosphere to get target material.
3. the preparation method of composite nano materials according to claim 2, which is characterized in that the molysite are as follows: nitric acid
Iron, iron chloride, ferric acetate, one of ferric sulfate and ferrous sulfate；The nickel salt are as follows: nickel nitrate, nickel chloride, nickel acetate,
One of nickel sulfate.
4. the preparation method of composite nano materials according to claim 3, which is characterized in that the molysite are as follows: nitric acid
Iron, one of iron chloride；The nickel salt are as follows: nickel nitrate, one of nickel acetate.
5. according to the preparation method of composite nano materials described in Claims 2 or 3 or 4, which is characterized in that the molysite with
The molar ratio of nickel salt are as follows: 10:1 ~ 5:2.
6. the preparation method of composite nano materials according to claim 5, which is characterized in that the molysite and nickel salt
Molar ratio are as follows: 10:1 ~ 5:1.
7. the preparation method of composite nano materials according to claim 2, which is characterized in that the organic solvent are as follows:
Ethyl alcohol, propyl alcohol, one of ethylene glycol.
8. the preparation method of composite nano materials according to claim 7, which is characterized in that the organic solvent are as follows:
Ethyl alcohol, one of ethylene glycol.
9. the preparation method of composite nano materials according to claim 2, which is characterized in that the complexing agent are as follows: lemon
Lemon acid, one of sodium citrate.
10. the preparation method of composite nano materials according to claim 2, which is characterized in that complexing agent and molysite add
Adding molar ratio is 2-4:1.
11. the preparation method of composite nano materials according to claim 9, which is characterized in that complexing agent and molysite add
Adding molar ratio is 3:1.
12. the preparation method of composite nano materials according to claim 2, which is characterized in that the stirring rate are as follows:
400~600 rpm；The drying temperature are as follows: 80 ~ 100 DEG C；The protective atmosphere are as follows: one of argon gas or nitrogen.
13. the preparation method of composite nano materials according to claim 2, which is characterized in that heating rate when sintering
Are as follows: 1 ~ 15 DEG C/min；Sintering temperature are as follows: 300 ~ 800 DEG C, 0.5 ~ 6 h of sintering time.
14. the preparation method of composite nano materials according to claim 13, which is characterized in that heating rate when sintering
For 5 ~ 10 DEG C/min；Sintering temperature is 550 ~ 700 DEG C, 2 ~ 3 h of sintering time.
15. the application of composite nano materials described in claim 1, which is characterized in that as nickel iron cell iron electrode cathode material
Material uses.
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| CN110394443B (en) * | 2019-07-03 | 2021-08-06 | 南昌大学 | Zero-valent nano iron-nickel powder for treating dye wastewater and preparation method thereof |
| CN110498451A (en) * | 2019-08-30 | 2019-11-26 | 济南大学 | A kind of nickel doping Fe3O4The preparation and electrocatalytic decomposition water application of nano-powder |
| CN110931269B (en) * | 2019-12-09 | 2021-12-17 | 河南创力新能源科技股份有限公司 | Capacitive iron-nickel battery iron electrode |
| CN113540431A (en) * | 2021-07-09 | 2021-10-22 | 沈阳理工大学 | Alkaline iron-nickel secondary battery negative electrode active material and preparation method thereof |
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