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(103 votes) Published: Sep 02, 2006 6:01 a.m. In 1 Favorites Lists Viewed 954 times
I discovered this cool trick mucking around in science a year ago and decided to post it here
I had nicked some lithium batteries from the scientific calculators and we were using 9v batteries to make circuits. i placed the lith battery on top of the 9v so it touched both the anode and cathod like such
lith
_____
_____
-???+
?????
?????
??9v?
?????
the battery got hot so it took it off.. and put it on the floor under my desk and replaced the battery. after about ten seconds it exploded and everyone jumped but noone knew what had happened. i thought "woot". i had some more batteries so i took them home and lit them up, it exploded with a red flash and a loud bang, characteristic of lithium.
this has many uses such as a source of lith for coloured fireworks, scaring people with the electric detonation method and you can use them to blow up mobile phones and other electrical items by creating a short across the battery (the dell computer caught fire from a lith battery overheat)
i found some details on lith battery explosion problems on wikipedia
"The most common consumer grade battery, about 80% of the lithium battery market. Uses inexpensive materials. Suitable for low-drain, long-life, low-cost applications. High energy density per both mass and volume. Can deliver high pulse currents. Wide temperature range. With discharge the internal impedance rises and the terminal voltage decreases. Maximum temperature limited to about 60 °C.
***High self-discharge at high temperatures***."
hmmm.. sounds like fun
Here is a plan for an idea of mine using li-ion batteries
this is untested, but i plan to try it asap
stuff:
several lith batteries (they look like 20c coins au, ill post a pic for everyone else)
lots of sparklers
cardboad sheet
tape
alfoil
1. roll the cardboard tube into a pipe greater than the diameter of a lith battery and wrap it with tape to hold it together, cover the end with alfoil and tape that up too.
2. crush the sparklers and put 3cm (bit more than an inch) of the dust in the bottom.
2.put a lith battery down the pipe and add another layer of sparklers.
3.repeat this till the pipe is full and make sure the top layer is a battery.
4. push a sparkler down the inside of the tube, right near the edge so it goes past the batteries right down to the bottom.
should look like this:
dotted line is a sparkler
:
:
|___:|
|???:| sparklers
|___:| lith cell
|???:| sparklers
|___:| lith cell
|???:| sparklers
|___:| lith cell
|???:| sparklers
|___:| lith cell
|???:| sparklers
|___:| lith cell
should be like a normal sparkler bomb but with red flshes and bangs. if the sparklers can actually lift each battery from the tube and explode in middair that would be sweet. tommorows a sunday and ill try to test it then, but.. im kind of broke after making co2 bombs today.
Se 02, 2006 4:28 pm - you need on of the rectangular 9v’s wit the two terminals on top, the kind used in smoke alarms
when the lithium battery touches both terminals of the 9v, current runs across the surface plate of the lithium battery, the metal’s resistance to current causes it to heat up, causing the lithium to expand and explode. wikipedia says not to use them above 60 degrees celsius but i dont think they explode till about 150 (the temp for fireworks is 350, and they can be set off with a spark)
Sep 22, 2006 4:51 pm - just an update:
apparently its not only the lithium that causes the explosion, it has a cadmium casing that when heated loses conductivity very rapidly and this causes it to heat up exponentialy (without limit, faster and faster)
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