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Chemistry on Lithium

04/15/2016 2:22 PM

This is a question on Lithium properties. I was reading about the properties of Lithium and it had a statement that it was highly reactive to water. It did not say how or in what form it was reactive or even what the reaction was. Can you tell me what kind of reaction it would be? I am interested in looking at using lithium plates in a battery. One idea is to use sea water as the other part of the cell. the second idea is how would a Lithium and air battery work. Does it use plain metal, or a oxide, or a salt mixture of some kind? My hearing aid batteries are Lithium and air but I don't know what is in them. They have a tiny hole in the back to admit air and when exposed they last a few days whether in the aid or not.

Thank you for an answer

Don

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#1

Re: Chemistry on Lithium

04/15/2016 3:13 PM

Lithium metals reacts slowly with water to form a colourless solution oflithium hydroxide (LiOH) and hydrogen gas (H2). The resulting solution is basic because of the dissolved hydroxide. The reaction is exothermic, but the reaction is slower than that of sodium (immediately belowlithium in the periodic table)

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#2

Re: Chemistry on Lithium

04/15/2016 3:17 PM

This is a far too comprehensive a question to ask on this site. There are a multitude of sites on the internet that will answer your questions. There is absolutely no reason to expect anyone here to regurgitate it all for your benefit. I think your question really may be some sort of a joke. Sorry, but I have to tell you: it's falling on stony ground.

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#3

Re: Chemistry on Lithium

04/15/2016 3:47 PM

Just get some lithium plates, a bucket of ocean, a voltmeter, a face shield and gloves; and go for it.

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#4

Re: Chemistry on Lithium

04/15/2016 5:33 PM

If you plop some in water it looks like this...

The you have potassium which is a little more energetic...

Then rubidium which begins to get rather violent.....

Then cesium which is not a good idea to be standing near.....

http://www.businessinsider.com/14-awesome-gifs-that-will-make-you-wish-you-paid-attention-in-chemistry-2013-5

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#5
In reply to #4

Re: Chemistry on Lithium

04/15/2016 5:38 PM

Love it!

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#7
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Re: Chemistry on Lithium

04/15/2016 6:47 PM

And if it's cesium-137, you can wear a lead shield, too. Sodium would have been interesting to see, also, perhaps from a distance.

(For those not familiar, Cs-137 is commonly used for pressure vessel radiography to test welds.)

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#9
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Re: Chemistry on Lithium

04/15/2016 8:03 PM

Sodium....very exciting

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#18
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Re: Chemistry on Lithium

04/16/2016 6:57 AM

A friend found a very rusty tin in the back of a shop she had just taken over. She phones me and asks what it was for, the label stated "½oz sodium in vacuum".

I took it to work to dispose of it (and have a bit of fun). I taped the tin to a brick, punched a small hole in it in threw it in a slurry drainage sump. It emptied all the slurry, just a pity I didn't run fast enough. Some of the plant operators were watching from an elevated walk way, they didn't escape the flying **** either.

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#25
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Re: Chemistry on Lithium

04/18/2016 2:50 PM

Engineers, man. I tell you. *smdh*

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#15
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Re: Chemistry on Lithium

04/16/2016 3:54 AM

Interesting that the reaction gets more violent with increasing atomic mass. But on the other side of the periodic table the halogens get less reactive as you go fluorine, chlorine etc. Any idea if there's a theory about why?

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#16
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Re: Chemistry on Lithium

04/16/2016 5:19 AM

The Group 1 elements have a lone electron in their outer shell, e.g. electronic configuration of Sodium: 2,8,1. Since the stable configuration for the outer shell is 8, then this lone electron is very easily lost to another atom to form an ionic bond, e.g. reaction with water:

2Na + 2H2O = 2Na+ + 2OH- + H2

As we move down the series Li, Na, K, Rb, Cs, that outer electron (negative charge) is further away from the positive nucleus and hence even more easily lost. Therefore the reactivity of the Group 1 elements increases with atomic number.

With the halogens - Group 7, the reverse is true. The configuration e.g. for Chlorine: 2,8,7. The atom needs to receive an electron to attain the stable octet. The further away from the nucleus, the less it's positive charge is felt at the outer shell, hence less likely to attract an electron. Thus iodine less reactive than bromine, less reactive than chlorine etc.

So cesium in contact with fluorine - run for cover. Heat of formation a massive 555 kJ/mole.

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#17
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Re: Chemistry on Lithium

04/16/2016 6:55 AM

OK thanks, never thought of it that way!

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#20
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Re: Chemistry on Lithium

04/16/2016 3:45 PM

Cesium the most reactive metal, combined with fluorine, the most reactive non-metal....Let the mayhem begin! Ok very small amount, let's not get too crazy...

https://www.youtube.com/watch?v=TLOFaWdPxB0

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#21
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Re: Chemistry on Lithium

04/16/2016 4:54 PM

A bit disappointing! I had more interesting & spectacular reactions in my shed as a teenager. (Chemical ones, you understand).

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#6

Re: Chemistry on Lithium

04/15/2016 6:18 PM

This is a case where a little knowledge is a dangerous thing.

Play with two double A batteries, it's safer.

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#8

Re: Chemistry on Lithium

04/15/2016 7:02 PM

If you're asking about the properties, I would say that you are not ready to make your own batteries. It's a lot more complicated than putting two dissimilar metals into an electrolyte.

Lithium is the tamest of the alkali metals in the left column of the periodic table, but is still a very reactive metal. Lithium batteries store a lot of energy and, if damaged or not designed properly, are prone to catching fire. It's not something the hobbyist can just throw together.

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#10

Re: Chemistry on Lithium

04/16/2016 12:17 AM

Sounds like you need some hands-on experience! Go here to get the Li so you can play around with it:

https://www.youtube.com/watch?v=BliWUHSOalU

Lithium reacts with H2O thus:

2 Li + 2 H2O → 2 LiOH + H2

The heat of the reaction is enough to ignite the H2 as you can see in the videos.

Some Li background:

http://www.livescience.com/28579-lithium.html

Lithium battery science:

http://batteryuniversity.com/learn/article/lithium_based_batteries

As you can see here, not the base metal, but the oxide.

Looks like you've got your work cut out for you!

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#11

Re: Chemistry on Lithium

04/16/2016 12:37 AM

Thank you for your answers. I did not know the answer and you guys gave me several good ones. My little brother lives on a sail boat and has been fighting the battery charging monsters since he moved on the boat in the late 90's. I have often wondered if there is a better way. I wondered if Lithium was a good idea but I think not for me to do anything with.

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#12
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Re: Chemistry on Lithium

04/16/2016 1:24 AM

Can't beat solar panels...need a good charge controller in any case...

https://www.emarineinc.com/Wind-Generator-vs-Solar-Panels-Which-is-Better-For-Your-Boat

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#13
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Re: Chemistry on Lithium

04/16/2016 1:26 AM

Check out LiFePo4 (LFP or LYP or lithium ferrous) batteries or individual cells.

They are far safer than standard Li (LiCo) technology such as Boeing used, they won't burn or explode.

3.2v per cell, so 4 of them works well for a 12v system.

I have 600Ah of LYPs in my RV and run the airconditioner, microwave, water heater, induction cooktop, hairdryer, toaster, kettle, or anything else that I might want to, obviously one at a time, but the voltage sag of lead acids prevents this versatility, not a problem with LYPs, I can drag 300 amps from the pack for an hour and still be above 13v terminal.

They can be discharged at incredible current flows up to 6 times their Ah capacity and don't have to be recharged before storage as do Lead acid chemistries.

They maintain a terminal voltage well over 12v until almost flat and can be continually discharged beyond 80% depth of discharge compared to maximum 50% recommended for LA.

They charge much faster than LAs, have a Peukert constant close to 1, and have a much greater cycle life.

Cost for the battery is dearer, but cost per usable watt hour is cheaper.

With regard to your hearing aid batteries, put a bit of tape or the original air seal back on the batteries when not in use and they will last far longer.

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#14

Re: Chemistry on Lithium

04/16/2016 2:30 AM

Try this site for all you need to know.

http://www.periodicvideos.com/

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#19
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Re: Chemistry on Lithium

04/16/2016 9:37 AM

Thanks for the link.Very informative and useful.

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#22

Re: Chemistry on Lithium

04/17/2016 9:43 AM

Lithium is reactive to water in either liquid or gas form. I once visited a lithium battery factory in Miami. In order to manufacture the batteries, the ambient clean-room gas was maintained at a constant 120 ppm H2O. This is exceptionally dry for Florida. The equipment used to maintain this dryness level was both massive and expensive. When asked why they needed such equipment, they explained that that it was determined that the operation was too delicate to be performed in a conventional dry-box with gloves. They gave me a chunk of lithium metal as a souvenir, an after a few years, it turned from a lustrous metal into a gray pile of powder.

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#23

Re: Chemistry on Lithium

04/18/2016 6:26 AM

The chemistry of Lithium is in the public domain and widely published. The Wikipedia articles on the topic would be an easy starting point.

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#24

Re: Chemistry on Lithium

04/18/2016 9:25 AM

Quick rule of thumb:

"Lithium metals" (First column of the periodic table) + water = BOOM.

Once you've studied enough chemistry to know why that equation is "True, but not really True," then you'll know enough to continue with your lithium/salt water battery, if you still wish to at that point.

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