2. Kaushik Balakrishnan, PhD
Research Summary
kaushik.balakrishnan@gmail.com
Role
of
Carbon
in
Supercapacitors
and
Li-‐ion
ba;eries
E
=
0.5
CV2
P
=
V2/
4R
E - energy density
P - power density
Electrolyte) (V))
Aqueous' 1)
Organics' 3.6)
RTIL' 425)
E
and
P
are
calculated
per
unit
area,
volume,
mass
–
each
electrode,
both
electrodes,
device
Some
metrics
3. Kaushik Balakrishnan, PhD
Research Summary
kaushik.balakrishnan@gmail.com
Graphene
based
Supercapacitor
Some
performance
metrics
✓
99
–
135
F/g
–
First
report
(Org.
electrolyte
and
aq.
electrolyte)
–
Ruoff
et
al.
✓
117
F/g
–
Rao
et
al.
J
Chem.
Sci.
2008,
p9.
✓
205
F/g
;
power
density
10
kW/kg
Energy
denisty
(28.5
Wh/Kg)
–
aq.
Electrolyte
–
Chen
et
al.
JPCC,
2009.
✓
Curved
graphene
–
Energy
density
=
85.6
Wh/kg
(RTIL,
RT)
Energy
density
=
134
Wh/kg
(RTIL,
80
oC)
-‐
Jang
et
al.
Nano
LeE.
2010,
p4863
–Nanotek
Ruoff
et
al.
Nano
LeE.,
2008,
p3498
4. Kaushik Balakrishnan, PhD
Research Summary
kaushik.balakrishnan@gmail.com
Graphene
Graphene
–
sp2
bonded,
honeycomb
network
of
Carbon
atoms
Graphene(
Graphene(oxide(
✦
Thinnest
know
material
✦
Planar
✦
ExcepLonal
electronic
properLes
✦
Highly
conducLve,
and
large
surface
area
✦
SyntheLc
advances
allow
for
realizing
high
yield
and
high
quality
CVD$setup$
Nobel
Prize
:
Andre
Geim
and
KonstanNn
Novoselov
(2010)
5. Kaushik Balakrishnan, PhD
Research Summary
kaushik.balakrishnan@gmail.com
From
Mechanical
ExfoliaLon
to
Chemical
ProducLon
Graphene
ExfoliaLon
by
soluLon
exfoliaLon
of
graphite
Improved
yields
Quality
control
challenging
Chemical
oxidaLon
to
yield
Graphene
oxide
followed
by
reducLon
Easy,
high
yields
MulK-‐layer
graphene
oMen
Varying
qualiKes
depending
on
reducKon
method
employed
Chemical
vapor
deposiLon
(CVD)
High
quality
single-‐layer
now
large
area
possible
Needs
to
be
transferred
to
desired
substrate
ExfoliaLon
by
peeling
from
HOPG
-‐
2004
(Nobel
prize)
High
quality
Low-‐yields
SyntheNc
approaches
to
Graphene
6. Kaushik Balakrishnan, PhD
Research Summary
kaushik.balakrishnan@gmail.com
Applications of Nanocarbon structures in Energy Storage
Process Development for layer-by-layer assembly of Graphene films
• Synthesis of Graphene oxide (GO); Graphene; reduced GO
• Nanocomposite ionic separators: Advance Energy Storage
Process & Application Development: ‘in-plane’ Graphene Supercapacitors
Nanoletts,, 2011, pp1423
Nanoletts,, 2011, pp1423
Sci. Reports, 2013, 3
J. Phys. Chem. Letts.,2012, 986
2D Mater., 2014, 011008
Unpublished
Commercial dip-coating &
Drop-on-demand approaches
Uniform Ultrathin Films
3x improvement in performance
