<s>
A	O
lithium-ion	B-Algorithm
flow	I-Algorithm
battery	I-Algorithm
is	O
a	O
flow	B-Algorithm
battery	I-Algorithm
that	O
uses	O
a	O
form	O
of	O
lightweight	O
lithium	B-Language
as	O
its	O
charge	O
carrier	O
.	O
</s>
<s>
The	O
flow	B-Algorithm
battery	I-Algorithm
stores	O
energy	O
separately	O
from	O
its	O
system	O
for	O
discharging	O
.	O
</s>
<s>
Flow	B-Algorithm
batteries	I-Algorithm
suspend	O
grains	O
of	O
solid	O
material	O
in	O
a	O
liquid	O
,	O
which	O
preserves	O
its	O
characteristics	O
,	O
making	O
lithium	B-Language
's	O
high	O
energy	O
density	O
available	O
to	O
flow	O
systems	O
.	O
</s>
<s>
One	O
device	O
uses	O
dissolved	O
sulfur	O
as	O
the	O
cathode	O
,	O
lithium	B-Language
metal	O
as	O
the	O
anode	O
and	O
an	O
organic	O
solvent	O
as	O
the	O
electrolyte	O
.	O
</s>
<s>
It	O
uses	O
a	O
single	O
tank	O
and	O
pump	O
and	O
reacts	O
the	O
LiS	O
with	O
lithium	B-Language
to	O
produce	O
power	O
.	O
</s>
<s>
When	O
discharging	O
,	O
the	O
lithium	B-Language
polysulfide	O
absorbs	O
lithium	B-Language
ions	O
;	O
releasing	O
them	O
when	O
charging	O
.	O
</s>
<s>
The	O
device	O
incorporated	O
a	O
lithium-ion	O
permeable	O
membrane	O
.	O
</s>
<s>
A	O
cathode-flow	O
lithium-iodine	O
(	O
Li	O
–	O
I	O
)	O
battery	O
uses	O
the	O
triiodide/iodide	O
(−/	O
I−	O
)	O
redox	O
couple	O
in	O
aqueous	O
solution	O
.	O
</s>
