CN101182678A - Graphite felt watch surface modified method and modified mineral carbon felt - Google Patents
Graphite felt watch surface modified method and modified mineral carbon felt Download PDFInfo
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Abstract
The invention relates to a graphite fiber felt surface modification method and a modified graphite fiber felt, and belongs to the all vanadium redox flow battery electrode manufacture technical field. The method step is that the electrochemical cathode modification treatment is conducted before the anode oxidation treatment. When used as an electrode, a modified graphite fiber felt greatly improves the electrochemical activity in the preparation of an all vanadium redox flow battery, promotes the voltage efficiency and the battery energy efficiency during the battery discharging, and increases the stable discharging time, so the recharging and discharging performance of the all vanadium redox flow battery is greatly improved. Moreover, the method is easy for implantation and low in the cost. No particular devices are required. The invention provides a good-performance electrode material for the battery manufacture field.
Description
Technical field
The present invention relates to the surface modifying treatment of graphite felt, belong to vanadium redox battery electrode manufacturing technology field
Background technology
The vanadium redox battery electrode generally acknowledges that at present to adopt graphite felt be best.Graphite felt is by organic fiber or asphalt-based material forms after carbonization and graphitization processing, phosphorus content is very high carbon fibre.Graphite felt is good stability in electrolyte, and real surface is long-pending big, but wettability is poor, and electro-chemical activity is bad, must be through surface modification treatment before using.
The graphite felt surface modifying method that past adopts has 1. vapour phase oxidation process, i.e. heated oxide in air; 2. liquid phase oxidation promptly soaks in acid with strong oxidizing property, as soaking in the mixed liquor of the sulfuric acid, nitric acid or the sulfuric acid that heat and nitric acid; 3. electrochemistry anodic oxidation is an electrolyte with solution such as sulfuric acid or nitric acid promptly, and graphite felt is that anode carries out electrolytic oxidation; 4. the coating processing method is promptly passed through deposition or chemical plating at graphite felt surface-coated one deck conductive materials, as platinum, iridium, indium or polyaniline etc.Wherein, method 1. 2. 3., particularly 3. method can make graphite felt wettability and electro-chemical activity increase, in system, do not introduce new element, but the chemical property of electrode is still not ideal enough, the electro-chemical activity that mainly shows the graphite felt electrode is poor, and voltage efficiency is not high enough in battery charge and discharge process.The employing method 4. electrode handled of modification is using the initial stage effect better, but battery is after circulation after a while, and the coating of electrode comes off easily, and electrode activity reduces greatly and bring impurity in system.
At present, there is not to improve simultaneously the modification processing method of graphite felt wettability and electro-chemical activity in the prior art.
Summary of the invention
At the problems referred to above, the invention provides a kind of modification processing method that can improve graphite felt wettability and electro-chemical activity simultaneously.This method adopts the modification of electrochemistry negative electrode to combine with traditional electrochemistry anode modification the graphite felt electrode surface to be carried out modification, its wettability and electro-chemical activity are improved, thus voltage efficiency and discharge performance in the raising battery charge and discharge process.
Graphite felt surface modifying treatment provided by the present invention: before the anodic oxidation modification is handled, carry out the modification of electrochemistry negative electrode earlier and handle.Further, may further comprise the steps:
A. electrochemistry cathode treatment: with the graphite felt is negative electrode, and alkali lye is electrolyte, feeds direct current and graphite felt is carried out the modification of electrochemistry negative electrode handles, and cleans the alkali lye on graphite felt surface then with distilled water;
B. electrochemical anodic oxidation modification: cleaned clean graphite felt is made anode, is electrolyte with the sulfuric acid solution of 0.05～4M, feeds direct current and graphite felt is carried out the anodic oxidation modification handles.
Can clean the acid on its surface according to actual conditions needs and subsequent treatment needs, quicker in order to clean, clean, thorough, preferred hot distilled water (70-80 ℃) cleans.
Wherein, the temperature when the feeding direct current carries out electrochemistry negative electrode modification processing to graphite felt in a step is 50～90 ℃, and current density is 75～160mA/cm
2, the processing time is 4～10min.The described electrolyte of a step is at least a in the strong base solution of alkali metal salt soln, 10～40g/l.Electrolyte can be selected: at least a in the sodium phosphate of the NaOH of 10～40g/l, the sodium carbonate of 0.1～20g/l, 0.1～20g/l.Concrete kind and consumption that electrolyte adds can be adjusted definite according to the needs of basicity.
In order effectively to handle the bigger graphite felt of lipophile, can in the described electrolyte of a step, add emulsifying agent 1～2g/l.Mentioned emulsifier is preferably in soap, odium stearate, the lauryl sodium sulfate at least a.
Wherein, the concentration of sulfuric acid solution is preferably 1M in the b step.
In the preparation vanadium redox battery, can improve electro-chemical activity as electrode greatly with the graphite felt after the graphite felt surface modifying method of the present invention modification, improve the voltage efficiency of battery discharge and the efficient of the energy content of battery, simultaneously can improve its stable discharging time, improved the wettability of graphite felt, helping electrolyte fully contacts with graphite felt, make the surface area that participates in electrochemical reaction improve, thereby make that the charge-discharge performance of vanadium redox battery is greatly improved.Operation is simple for graphite felt surface modifying method of the present invention, do not need special installation, with low cost.For battery electrode manufacturing field provides a kind of well behaved electrode material.
Description of drawings
Graphite felt I after Fig. 1 adopts the inventive method modification to handle is as the charging and discharging curve of electrode;
Fig. 2 adopts the charging and discharging curve of the graphite felt I of only process anode modification processing as electrode;
Graphite felt II after Fig. 3 adopts the inventive method modification to handle is as the charging and discharging curve of electrode;
Fig. 4 adopts the charging and discharging curve of the graphite felt II of only process anode modification processing as electrode;
Graphite felt III after Fig. 5 adopts the inventive method modification to handle is as the charging and discharging curve of electrode;
Fig. 6 adopts the charging and discharging curve of the graphite felt III of only process anode modification processing as electrode.
Below by the specific embodiment the present invention is further described, be limitation of the present invention but should not be construed as.All modification, replacement, changes of making based on the above-mentioned technological thought of the present invention all should belong to the present invention.
The specific embodiment
Graphite felt method of modifying of the present invention comprises modification processing of electrochemistry negative electrode and electrochemistry anode modification processing two big steps.
The modification of electrochemistry negative electrode is handled: with the graphite felt is negative electrode, and the mixed solution of alkali lye or alkali lye and emulsifying agent is an electrolyte, and electrolyte temperature is 50～90 ℃; Feed direct current graphite felt is carried out the electrochemistry cathode treatment, current density is 75～160mA/cm
2Take out behind 4～10min, the alkali lye that cleans the graphite felt surface is to neutral standby.
Wherein, above-mentioned alkali lye is at least a in NaOH, sodium carbonate, the sodium phosphate; Above-mentioned emulsifying agent is at least a in soap, odium stearate, the lauryl sodium sulfate; Quick in order to clean, clean, thorough, above-mentioned cleaning step can select for use hot distilled water (70-80 ℃) to clean.
Wherein, NaOH is as electrolyte, and its aqueous conductive ability is strong, and concentration is high more, and conductive capability is strong more, and current density is big more, and treatment effect is good more.On the other hand, NaOH is as highly basic, has very strong saponification ability, when emulsifying agents such as soap exist, if the product that the content of NaOH too high when 2.5mol/l (about) can make saponification form is difficult to dissolving, on the graphite felt electrode, this will hinder cell reaction and carry out on the graphite felt surface.
Improve alkali liquid temperature and can reduce bath resistance, increase current density, promote reaction to take place, fast reaction speed improves modification efficiency, saves energy; But temperature too high (about 90 ℃ time) can consume a large amount of heat energy, and the alkali mist of formation pollutes the operation site environment, worsens working condition.Improve current density and can improve processing reaction speed and improve the interior treatment effect of graphite felt micropore, but too high (the about 160mA/cm of current density
2The time) can form a large amount of alkali mist or acid mist, contaminated environment.Processing time is long more, and treatment effect is good more, but a large amount of alkali mists also can appear in electrolysis time oversize when 10min (about).
Graphite felt after the negative electrode modification procedure is handled is soaked with running water with the graphite felt of handling without the negative electrode modification, and graphite felt is good because of wettability after the modification, soaks into comparatively fast, and the time that is sunken in the water is short; And the graphite felt that is untreated is poor because of wettability, and the long period bubbles through the water column.
The modification of electrochemistry anode is handled: make anode with the graphite felt after modification is handled through the electrochemistry negative electrode, the 1M sulfuric acid solution is an electrolyte, water-bath is heated to 85-90 ℃, feeds direct current graphite felt is carried out anodic oxidation modification processing, oxidation current density 150～200mA/cm
2, take out standby behind oxidization time 4～10min; Clean the sulfuric acid on graphite felt surface repeatedly with distilled water, oven dry is as battery electrode.
The modification of electrochemistry anode goes out in the treatment step, sulfuric acid solution concentration is high more, oxidability is strong more, and treatment effect is better, but sulfuric acid concentration too high when 4M (about) not only can form a large amount of acid mists, worsen working condition, and degree of oxidation is excessive, may make the carbon fiber wire fracture or the part fracture of graphite felt, in the battery operation process, the filament of these fractures will stop up barrier film, have a strong impact on battery performance.Improve electrolyte temperature and can reduce bath resistance, increase current density, promote reaction to take place, fast reaction speed improves treatment effeciency, saves energy; But temperature too high (about 90 ℃ time) can consume a large amount of heat energy, and the acid mist pollution operation site environment of formation worsens working condition.Improve current density and can improve processing reaction speed and improve the interior treatment effect of graphite felt micropore, but too high (the about 200mA/cm of current density
2The time), can form a large amount of acid mists, contaminated environment.Processing time is long more, and treatment effect is good more, but electrolysis time oversize when 10min (about) a large amount of acid mists can occur, and the graphite felt filament can be because of the seriously corroded easy fracture.
Below by specific embodiment the present invention is further described beneficial effect of the present invention.
The index parameter of the graphite felt that following examples adopt:
Graphite felt I: C content 〉=95%; Ash content＜1.5%; Bulk density 0.08～0.17g/cm
3
Graphite felt II: C content 〉=94%; Ash content＜0.78%; Bulk density 0.1～0.15g/cm
3
Graphite felt III: C content 〉=99%; Ash content＜0.05%; Bulk density 0.094～0.12g/cm
3
With graphite felt I is negative electrode, NaOH and Na
2CO
3And the lauryl sodium sulfate mixed solution is electrolyte, and bath composition is NaOH 20g/l, sodium carbonate 20g/l, emulsifying agent 2g/l, and electrolyte temperature is 80 ℃; Feed direct current graphite felt is carried out the electrochemistry cathode treatment, current density is 75mA/cm
2Take out standby behind the 4min; Use hot distilled water (70-80 ℃) and distilled water to clean graphite felt surface alkali lye repeatedly successively.Make anode with the graphite felt after modification is handled through the electrochemistry negative electrode, the 1M sulfuric acid solution is an electrolyte, and water-bath is heated to 85 ℃, feeds direct current graphite felt is carried out anodic oxidation modification processing, oxidation current density 160mA/cm
2, take out standby behind the oxidization time 4min; Clean the graphite felt surface acid repeatedly with distilled water, and oven dry, make the inventive method modified graphite felt I.
Be that an electrode and a graphite felt I that only modification is handled through the electrochemistry anode are electrode with the inventive method modified graphite felt I respectively, the Nafion-1135 film is that to be assembled into electrode area be 100cm to barrier film
2Flow model monocell, the current density of battery charge are 50mA/cm
2, the current density of discharge is 60mA/cm
2The chemical property of graphite felt is tested and compared, the results are shown in Table 1, Fig. 1 and Fig. 2.
Table 1 60mA/cm
2The different modification processing methods of graphite felt I influence battery performance under the condition
| Sample | Voltage efficiency | Energy efficiency | Discharge time |
| 1 (the inventive method modified graphite felt electrode I) | 0.877 | 0.801 | 60 |
| 2 (graphite felt electrode I is handled in the modification of electrochemistry anode) | 0.822 | 0.762 | 40 |
By table 1, Fig. 1 and Fig. 2 as can be known, the graphite felt I that the inventive method modification is handled is the monocell that electrode is assembled into, its voltage efficiency and the energy effciency ratio graphite felt I difference high 5.5% and 4% that only modification is handled through the electrochemistry anode.The graphite felt electrode I that the inventive method modification is handled steadily discharges more than the 60min, and graphite felt electrode I (same discharge stream density and identical electrolyte capacity) electrode discharge 40min electric current under similarity condition of only handling through the anode modification just significantly descends.
With graphite felt II is negative electrode, NaOH and Na
2CO
3Mixed solution is an electrolyte, and concentration respectively is 20g/L, and electrolyte temperature is 50 ℃; Feed direct current graphite felt is carried out the electrochemistry cathode treatment, current density is 140mA/cm
2Take out standby behind the 8min; The distilled water of using hot distilled water (70-80 ℃) and distilled water to clean repeatedly after the graphite felt surface is extremely cleaned successively is neutrality.Make anode with the graphite felt after modification is handled through the electrochemistry negative electrode, the 1M sulfuric acid solution is an electrolyte, and water-bath is heated to 90 ℃ ± 1 ℃, feeds direct current graphite felt is carried out anodic oxidation modification processing, oxidation current density 160mA/cm
2, take out standby behind the oxidization time 4min; The distilled water that cleans repeatedly after the graphite felt surface is extremely cleaned with distilled water is neutral, and oven dry, makes the inventive method modified graphite felt II.
Be that an electrode and a graphite felt II that modification is handled through the electrochemistry anode are electrode with the inventive method modified graphite felt II respectively, homemade PE film is that barrier film is assembled into 100cm
2Flow model monocell, battery charge density are 50mA/cm
2, discharge current density is 60mA/cm
2The chemical property of graphite felt is tested and compared, the results are shown in Table 2, Fig. 3 and Fig. 4.
Table 2 60mA/cm
2The different modification processing methods of graphite felt II influence battery performance under the condition
| Sample | Voltage efficiency | Energy efficiency | Discharge time |
| 1 (the inventive method modified graphite felt electrode II) | 0.739 | 0.703 | 65min |
| 2 (graphite felt electrode II is handled in the modification of electrochemistry anode) | 0.693 | 0.653 | 10min |
By table 2, Fig. 3 and Fig. 4 as can be known, the monocell that the graphite felt electrode II that adopts the inventive method modification to handle is assembled into, its voltage efficiency and the energy effciency ratio graphite felt electrode II that only modification is handled through the electrochemistry anode improves 4.6% and 5% respectively.The inventive method modified graphite felt electrode II is at discharge current density 60mA/cm
2Under the condition, can be more than the stable discharging 60min; And the graphite felt electrode II that only modification is handled through the electrochemistry anode (same discharge stream density and identical electrolyte capacity) under similarity condition, substantially can not stable discharging.
Embodiment 3
With graphite felt III is negative electrode, and NaOH solution is electrolyte, and concentration is 40g/L, and electrolyte temperature is 90 ℃; Feed direct current graphite felt is carried out the electrochemistry cathode treatment, current density is 160mA/cm
2Take out standby behind the 10min; The distilled water of using hot distilled water (70-80 ℃) and distilled water to clean repeatedly after the graphite felt surface is extremely cleaned successively is neutrality.Make anode with the graphite felt after modification is handled through the electrochemistry negative electrode, the 1M sulfuric acid solution is an electrolyte, and water-bath is heated to 85 ℃, feeds direct current graphite felt is carried out anodic oxidation modification processing, oxidation current density 160mA/cm
2, take out standby behind the oxidization time 4min; The distilled water that cleans repeatedly after the graphite felt surface is extremely cleaned with distilled water is neutral and oven dry, makes the inventive method modified graphite felt III.
Graphite felt III with the inventive method modified graphite felt III and only process electrochemistry anode modification processing is an electrode respectively, and the Nafion-117 film is that barrier film is assembled into 100cm
2Flow model monocell, the current density of battery charge are 50mA/cm
2, the current density of discharge is 60mA/cm
2The chemical property of graphite felt is tested and compared, see Table 3, Fig. 5 and Fig. 6.
Table 3 60mA/cm
2The different modification processing methods of graphite felt III influence battery performance under the condition
| Sample | Voltage efficiency | Energy efficiency | Discharge time |
| 1 (the graphite felt electrode that embodiment 3 modifications are handled) | 83.1 | 76.8 | 40min |
| 2 (the graphite felt electrode is handled in the modification of electrochemistry anode) | - | - | 0min |
In the table 3 because of the electrode of cathode treatment not at 60mA/cm
2Can not stable discharging under the condition, so voltage efficiency and energy efficiency equivalence in the table can't be added up.As shown in Figure 5, the graphite felt III that adopts the inventive method modification to handle is the monocell that electrode is assembled into, at discharge current density 70mA/cm
2Under the condition, about energy stable discharging 40min; As shown in Figure 6, even only the graphite felt electrode III of process anode modification processing is at 60mA/cm
2Can not stable discharging under the condition.
Claims (10)
1. the graphite felt surface modifying method is characterized in that: carry out the modification of electrochemistry negative electrode earlier and handle before the anodic oxidation modification of electrochemistry anodic oxidation is handled.
2. graphite felt surface modifying method according to claim 1 is characterized in that: may further comprise the steps:
A, the modification of electrochemistry negative electrode are handled: with the graphite felt is negative electrode, and alkali lye is electrolyte, feeds direct current graphite felt is carried out electrochemistry negative electrode modification processing, cleans the alkali lye on graphite felt surface then with distilled water;
B, electrochemical anodic oxidation modification handle: the graphite felt that cleans up is made anode, is electrolyte with the sulfuric acid solution of 0.05～4M, feeds direct current and graphite felt is carried out the anodic oxidation modification handles.
3. graphite felt surface modifying method according to claim 2 is characterized in that: the temperature that the feeding direct current carries out electrochemistry negative electrode modification processing to graphite felt in a step is 50～90 ℃, and current density is 75～160mA/cm
2, the processing time is 4～10min.
4. graphite felt surface modifying method according to claim 2 is characterized in that: electrolyte described in a step is at least a in the strong base solution of alkali metal salt soln or 10～40g/l.
5. graphite felt surface modifying method according to claim 4 is characterized in that: the described electrolyte of a step is: at least a among NaOH 10～40g/l, sodium carbonate 0.1～20g/l, the sodium phosphate 0.1～20g/l.
6. graphite felt surface modifying method according to claim 5 is characterized in that: the emulsifying agent that also adds 1～2g/l in the described electrolyte of a step.
7. graphite felt surface modifying method according to claim 6 is characterized in that: described emulsifying agent is at least a in soap, odium stearate, the lauryl sodium sulfate.
8. graphite felt surface modifying method according to claim 2 is characterized in that: the sulfuric acid solution concentration in the b step is 1M.
9. the modified graphite felt that obtains of each described graphite felt surface modifying method of claim 1～8.
10. the application of the described modified graphite felt of claim 9 in preparation vanadium redox battery electrode.
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