Microwave turned plastic waste into raw material for the production of anodes of batteries

Metal-ion
batteries — energy storage, vector control
charge which are metal ions.
Li-ion
the batteriesthat came
on the market
1991
year
today
common
everywhere: they are the laptops,
smartphones
and even electric cars.
In connection with such active use of lithium, its reserves on the planet began to dwindle, so it looks promising transition to
sodium-ion batteries
sodium is found in nature almost
in
1000
times
most lithium.

The anode
in metal-ion
batteries
call the electrode that gives off ions
metal in the discharge process.
The anode
the material should have a high
bit
capacity
and
stability
— that is, to accommodate
in lots of metals
to withstand
a large number of recharge cycles. Modern
anodes for lithium-ion batteries
made on
graphite based
between
layers which can
to fit lithium.
Larger sodium more difficult to introduce between the graphite layers, so for the anode of sodium-ion batteries, scientists are looking for other materials: among them
call
composites
on the basis of nanoparticles
terephthalate
sodium (Na2C8H4O4).
Crystal
grille
this
salt has
a lot of voids, which can accommodate
extra sodium when the battery
charging.

Team
Indian and American chemists under
the leadership of Vilas
Sex (Vilas
G. Pol) from Purdue University suggested
to this
material from crushed pet bottles. Process
very
simple: to a suspension of polyethylene terephthalate in ethylene glycol
add
an excess of sodium hydroxide
and irradiated with microwave radiation in
for two minutes.
In this case
occurs alkaline hydrolysis (saponification)
ester
bridges consisting of polyethylene terephthalate,
and his chains break down to monomer
blocks
— ethylene glycol and terephthalate
sodium. Last
falls
the sediment and it remains only
to attentiveservice
and dry.
For
full conversion of all
polyethylene terephthalate enough
power of one kilowatt, then
there are synthesis can be carried out in the standard
microwave oven. X-ray phase
analysis
IR spectroscopy and NMR spectroscopy
confirm
this
product
not
inferior in purity terephthalate
sodium, which are the traditional
way — out
of terephthalic acid.

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