Updates of the Next Generation Lithium-ion Space Chemistry ...
Transcript of Updates of the Next Generation Lithium-ion Space Chemistry ...
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Updates of the Next Generation Lithium-ion Space Chemistry, for improved Energy density and Improved Cycle Life
NASA Space Battery Workshop Huntsville, AL
November 18th, 2015 E. Alex Buonanno
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Next Generation Lithium-ion Prismatic Cells
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NCP12-4 Cell
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NCP12-4 Design • NCA/Synthetic Graphite
• 14.5 Ah BOL
• 12 Ah Nameplate
Physical Properties:
• 456 grams
• 4.45” Tall x 2.8” Wide x 1.0” Thick
NCP12-2 Flight Heritage:
X-37B Space Plane
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NCP43-4 Cell
NCP43-4 Design • NCA/Synthetic Graphite
• 47 Ah BOL
• 43 Ah Nameplate
Physical Properties:
• 1283 grams
• 6.0” Tall x 4.2” Wide x 1.2” Thick
NCP43-2 Flight Heritage: ASTRO (Orbital Express),
X-37B Space Plane
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NCP25-5 Cell
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NCP25-5 Design • NCA/Synthetic Graphite
• 35 Ah BOL
• 30 Ah Nameplate
Physical Properties:
• 950 grams
• 6.0” Tall x 3.7” Wide x 1.1” Thick
NCP25-1 Flight Heritage:
Phoenix, GRAIL, WISE, STPSat2,
NEXTSat, XSS-11
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Life Test Data and Results
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Life Cycle profiles
• NCP12-4 Cells ≈8% DoD at 30°C – 55 Minute charge @ 1.3 amps tapering to 4.1 volts
– 5 Minute discharge @ 13 amps
– 30 Minute Open circuit Rest
• NCP43-4 Cells 20% DoD at 30°C – 60 Minute charge @ 11 amps tapering to 4.1 volts
– 30 Minute discharge @ 14 amps
• NCP25-5 Cells 40% DoD at 20°C – 60 Minute charge @ 15 amps tapering to 4.0 volts
– 30 Minute discharge @ 24 amps
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NCP12-4 & NCP43-4 Life Cycle Summary of New Chemistry
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NCP12-4 Life cycles
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End-of-Discharge Voltage
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Full Discharge Capacity @ 30°C
CAT & Post 4320 Performed on Different Cycler
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50% SoC 30°C DC Resistance
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Comparison NCP12-4 vs. NCP12-2
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NCP12-2 vs. NCP12-4 Capacity @ 30°C
Post 4320
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NCP12-2 vs NCP12-4 Life Cycle Capacity Loss
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30°C Capacity NCP12-2 vs. NCP12-4
Life Cycle Checks
CAT vs. Post 4320 (CAT) Cycles
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50% SoC 30°C DC Resistance vs. NCP12-2
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NCP43-4 Life cycles
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End-of-Discharge Voltage
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Full Discharge Capacity @ 30°C
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50% SoC 30°C DC Resistance
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Comparison NCP43-4 vs. NCP43-2
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NCP43-2 vs. NCP43-4
Round 2 Initial Capacity
Post 4320
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Life Cycle Capacity Loss
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30°C Capacity NCP43-2 vs. NCP43-4
Life Cycle Checks
CAT vs. Post 4320 (CAT) Cycles
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50% SoC 30°C DC Resistance vs. NCP43-2
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NCP25-X Life Cycles
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20% DoD Life Cycling Testing
Lot 1 Cells chemistry the same as NCP25-5 cells
• 4 Lot 1 NCP25-X Cells 20% DoD @ 30° & 10°C – 60 Minute charge @ 17 amps tapering to 4.1 volts
– 30 Minute discharge @ 12 amps
• After Cycle 1767 of 30°,10°C, 20°, 40° & 50°C cells had capacity and DC resistance checked.
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20% DoD 30°C, 10°C & 20°C Life Cycles
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Lot 1 NCP25-X, 20% DoD @ 30°, 10°, 20°, 40° & 50°C End of Discharge Voltage
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Lot 1 Capacity Check
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Lot 1 DC Resistance Check
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40% DoD 20°C Cycles
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40% Life Cycling Testing
• 4 Lot 1 NCP25-X Cells 40% DoD @ 20°C – 60 Minute charge @ 15 amps tapering to 4.0 volts
– 30 Minute discharge @ 24 amps
• Capacity and DC Resistance Measured ~1000 cycles
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Lot 1 NCP25-X, 40% DoD @ 20°C End of Discharge Voltage
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Lot 1 Capacity Check
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Lot 1 DC Resistance Check
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Comparison NCP25-5 vs NCP25-1
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Life Cycle Capacity Loss
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0%
5%
10%
15%
20%
25%
30%
35%
40%
45%
0 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000
% C
ap
ac
ity L
os
s
# LEO Cycles
NCO "Lander" Chemistry Compared to NCA Chemistry
(NCP43-2) 4.1V Avg (NCP43-2) 3.9V Avg
(NCP20Ah) 3.9V AVG (NCP25-1) 4.1V Avg.
(NCP25-1) 3.9V **MSP01 Batteries**
(NCP55-2) 4.0V 30% DoD (NCP55-2) 4.0V 40% DoD
(NCP25-5) 4.0V, 40% DoD Avg. (NCP25-5) 4.1V 20% DoD (30, 10, 20, 40 & 50°C)
(2) 20 Ah Cells, 20°C- NCO Material, 0.5C charge to 3.9 volts for 60 min. with 0.8C discharge for 30 min.
(5) 30Ah Cells, 20°C- NCA Material, 0.5C charge to 4.0 volts for 60 min. with 0.8C discharge for 30 min.
(4) 30 Ah Cells- NCA Material, 0.6C charge to 4.1 volts for 60 min. with 0.4C discharge for 30 min. Cap check after 30°, 10°, 20°, 40° & 50°C
NCO Material
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Lot 1 Mission Power Profile
Avg. Cell Voltage @ hour 25 is 3.56 volts
Per PS_CMB.0001 the minimum cell voltage is 3.25 volts
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Status as of 9/28/15
• 20% NCP25-X cells completed various temperature cycling and capacity checks.
• 40% NCP25-X completed >10400 cycles @ 20°C, post capacity and DC Resistance after 1100 & 2400, 3400, 4400 … 10400 cycles.
• 40% NCP25-X cells ongoing 20°C Life Cycles
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Conclusions
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• Next Generation of Lithium-ion Space Chemistry for these prismatic cell designs yields improvements
– Increased BOL capacity – Decreased capacity loss over life
– Reduction of 3-times in impedance growth, following
LEO cycling
– Physical dimensions allow for Off-the-shelf designs,
utilizing this chemistry, gaining improvements for the next generation of space vehicle.
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Acknowledgments
Chad Deroy
Dr. Rob Gitzendanner
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