Www.covalentassociates.com SBIR Grant No. DE-FG02-06ER84598 K. K. Tikhonov, W.A. Cataldo and V. R....
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www.covalentassociates.com SBIR Grant No. DE-FG02-06ER84598 K. K. Tikhonov, W.A. Cataldo and V. R. Koch (P.I.) Covalent Associates, Inc. 10 State Street Woburn, MA 01801 Thermally Robust Capacitors for the Drilling Industry
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Transcript of Www.covalentassociates.com SBIR Grant No. DE-FG02-06ER84598 K. K. Tikhonov, W.A. Cataldo and V. R....
www.covalentassociates.com
SBIR Grant No. DE-FG02-06ER84598
K. K. Tikhonov, W.A. Cataldo and V. R. Koch (P.I.)
Covalent Associates, Inc.10 State Street
Woburn, MA 01801
Thermally Robust Capacitors for the Drilling Industry
www.covalentassociates.com
Drilling Industry Market for Down Hole Power Sources
• Li/SOCl2 battery sales >$200M/year
• A Li/SOCl2:EDLC hybrid power source that provides pulse power from the EDLC would capture half of the market
• At present, 95% of this market requires power sources that operate between 100ºC and 150ºC; 5% requires performance between 150ºC and 225ºC
www.covalentassociates.com
Phase I Objectives
• Synthesize, purify and electrochemically characterize a number of new IL electrolyte materials
• Evaluate the new electrolytes in EDLC coin cells and in wound AA-size cells (Redox Engineering) at temps ranging from 150ºC to 225ºC
Electrolyte Specific Conductance
0
10
20
30
40
50
60
70
80
0 50 100 150 200T (
oC)
Co
nd
uct
ivit
y (m
S/c
m)
IL2
1M TEABF4/PCIL1
IL3
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EDLC Hardware
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Redox EngineeringBonita Springs, FL
0
10
20
30
0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000
cycle #
Ca
pa
cit
an
ce
(F/
g)
Coin Cells: 150oC at 1.75V
0
10
20
30
0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000
cycle #
Ca
pa
cit
an
ce
(F/
g)
IL 1, 10 mA/cm2
IL 2, 10 mA/cm2
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Self-discharge at 150oC
0.0
0.5
1.0
1.5
2.0
2.5
0 20 40 60 80 100 120 140 160
Time (min)
Vo
lta
ge
(V
)
fresh
after 20 cycles
after 600 cycles
2 hours, OCV
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0
5
10
15
20
25
30
35
0 1000 2000 3000 4000 5000 6000cycle #
Ca
pa
cita
nce
(F
)Unoptimized Wound AA Cell
Performance at 150oC
IL 2
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IL3 Cyclability to 2V at 225oC
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0
5
10
15
20
0 5 10 15 20 25 30
cycle #
Ca
pa
cit
an
ce
(F
/g)
0.01
0.1
1
10
100
1000
10 100 1000 10000
Ragone Plot
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EDLC current pulses: 10 to 250 mA/cm2
at 150ºC with IL2
Summary• The new ionic liquid electrolytes have been shown to be thermo-
chemically and electrochemically compatible with commercially available electrodes and cell packaging at elevated temperatures.
• EDLC cycle life (>103 cycles) and calendar life (>103 hr) are more than adequate for down hole applications.
• Safe and reliable high temp EDLCs can be manufactured and sold for less than either bobbin or wound Li/SOCl2 batteries.
• Phase I objectives have been met; Phase II will advance high temp EDLC technology by testing hermetically sealed wound capacitors down hole in a pulser tool.
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