Improved Zinc Bromine gravity Battery
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- Опубликовано: 16 сен 2024
- Zinc Bromine gravity Battery - upgraded version!
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I've been experimenting with this type of cell using old zinc die castings (pot metal) as the zinc electrode. This metal can be easily melted and recast into whatever shape electrode you need. Adds a lot of weight (if that matters to you) but seem to be working. I got a fairly steady 500 mA from a dead short and noticed it jumped to 700+ mA when my electrode fell to the bottom of the jar.
Thanks. Really good ideas in both constructions. Also, you make an important observation about internal resistance and electrode separation distance.
Yes. In basic the cell is really good because is easy to make, etc, but,.... the main problem of gravity cell is the internal resistanc. And that is the reason for low energy efficiency.
Have you tried making lead foil electrode battery? The electrolyte can be as simple as baking soda in water. but also many others work as well like diluted sulfuric acid or sodium/potassium alum sulfate powder.
they sell sodium bromide on Ebay for less than $10 a pound.
Hello I'm going to be building a zinc bromide battery here soon and your battery build videos have been very helpful, so thank you. I read a article a while back about putting Nano diamond dust in the electrolyte to prevent dendrite growth. the article was about lithium batteries but I was wondering. Do you know if it would work in the zinc bromide solution electrolyte? I see you can buy diamond dust very cheap on eBay I'm just very curious to know.
The Article is titled
Recipe for safer batteries -- Just add diamonds
I know this is an old video, so I don't realistically expect a reply, but could you tell me what the self discharge is like?
Hello thanks for the video- can You say something about the self discharging of this battery type? Thanks
I wonder if silica gel is used as electrolyte would it work at all?
Nice video. A great improvement due to the surface area of this foam. Thanks axplaining all this so clearly. But do you think this carbon foam will last a while, or is it not so durable?
is not about the foam,... because in the large ZnBr gravity cell I use same foam with more area. The point is in the construction of the cell. Hard to say about the carbon felt
@@cayrex Okay. You mean that you've put the electrodes closer together with this cell? I thought the bigger surface area of the carbon also helps plating it faster.
@@markgeurts258 surface area will help with the power output. Charging speed will depends on current density and the material conductivity. The capacity depends on amount of the electrolyte
wont the double bonded C in the form and graphite get reacted by bromine?
Can you do the same thing with copper sulfate and sulfuric acid?
Have you ever tried Vanadium Bromide battery chemistry?
Yes.
@@cayrex Can you please link me to a video? I'd like to compare your result against my results. Thanks.
@@johnslugger Oh sorry I dont have a video about that battery
@@cayrex You should make. They are 200% more powerful than ZnBr on longevity and amperage. So easy to make, just add Vanadium powder to dark orange Bromine water. Every atom of Vanadium can hold 2 free electrons or oxidation states.
Is there a problem with dendrites if you go to close? I thought that any growths would need to get to the bromine layer to be dissolved, so if you put the carbon foam in to high would there be a possibility that it could short before growths reach enough bromine concentration to be dissolved?
Yes. The battery have metal anode so, have also problems with dendrites (especially zinc metal). For now only get the problem one time on that little ZnBr cell,... but then I completely discharge the cell and was fine next charge. You can also replace the zinc anode with carbon felt to reduce dendrites. Why I dont get so much problems with dendrites in that ZnBr gravity cell is because the bromine is also soaked into separator. And when the dendrites try to penetrade the separator,... the zinc react with bromine to form ZnBr2, which will dissolve back to electrolyte.
Super! Mi lahko izdaš, kje nabavljaš ZnBr2?
Naredim si sam
Run a joule thief with it?
Good job. Can we use sodium bromide?
is it posible sodium flow battery?
Thank you.
Sorry but is not so easy. If you use sodium bromide,... on the positive electrode will start to form some bromine but on the negative electrode you will end with hydrogen. The sodium is to reactive in water based elecrolyte
@@cayrex Thank you for answer..
Can you also use a positive electrode and negative electrode both made of carbon? Why use zink as negative?
Yes you can use carbon on the negative electrode. You can use zinc or carbon for the negative current collector.
@@cayrex Okay :), but what will happen if you don't use the zinc at all. And just use the electrolyte (zink bromide solution) and two carbon rots, I mean does this result in less output power or something?
@@markgeurts258 Nothing. The negative carbon will be coated with zinc when the cell is charging (and here you get your zinc). Using zinc plate for the cell can be a bit more cheaper and easy to use (at least for me). Zinc plate have also less problems of zinc diffusion. But anyway the performance of the cell with zinc plate or zinc plated carbon is more or less the same. Good thing about using carbon as negative current collector is that the carbon will not react like is this possible with zinc,.... which over the time can form zinc oxide, etc.
@@cayrex Thank you very much! :)
Can u make a video on all options chemical, mechanical, etc to minimize bromine issues after many cycles. In my test cell resistance keeps increasing due to yellow bromine...
The resistance of the cell is increasing? After how mqny cycles? How you made your cathode?
@@cayrex after 50 cycle charge efficiency reduced from 75 to 50 percent. Cathode is SS mesh bonded to graphoil electrode with Conductive graphite paste. Anode is thin graphite coating over Zinc foil. Anode Cathode spacing about 6mm with 3M Zinc bromide electrolyte
@@denniskramer9788 Hmm,... here can be the problem SS mesh,.... the SS is accessible to the electrolyte and create some parasitic reactions? At the beginning I also use SS current collectors and I get yellow-green colored electrolyte after 60 - 70 cycles. What about support electrlyte? 6mm spacing without separator? Maybe the start of the dendrites?
What is material for plastic vial? Any long term compatibility with PPE or PE or HDPE or Silicone?
Sorry, I dont know what plastic are. But HDPE will be good, which is also used by Redflow company
@@cayrex Next experiment, fill an IBC container with zink bromide haha :P
@@markgeurts258 hehe,... but in basic if you divided into 26 sections to get 26 cells wich will create 48V. And the total height of the container is full of the electrolyte,... you will get also really good capacity,...
@@cayrex if HDPE works that is good - widely used in milk jugs and medicine bottles - so readily available for experiments
@@dianekramer6467 a plastic vinegar bottle has been holding my old zinc bromine for about a year now.
so make more area less distance cells
this should be the default to all batteries and capacitors
that becomes multiple wide layers znbr battery for max output
gravity flow down battery, or just vertical layers (both give more output when fully charged)
yes still gravity and not flow battery type
just multiple stacked gravity znbr cells