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Last Modified 24.02.2010 19:15:23 P
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Polymer Binder for Silicon Anode
Inventor: Dr. Gao Liu, PhD Presentation by: Blake Brundidge
Morgan Hague Abraham Ringer Alexander Teran
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Lithium-Ion Batteries
• Convert electrochemical energy to electricity
• High energy density compared to other chemistries
Anode Cathode Electrolyte
Li+
e-
Current Collectors
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Slow Progress in Lithium-Ion Batteries
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Anode Chemistry Options
• Graphite has been industry standard since inception
0
500
1000
1500
2000
2500
3000
3500
4000
4500
LTO LVO Graphite Germanium Tin Silicon
Spe
cific
Cap
acity
(mA
h/g)
Li-Ion Anode Materials
• Silicon offers 12x improvement in theoretical capacity over graphite
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Silicon Anodes Drastically Increase Energy Density
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Challenge of Silicon Anodes
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• Large change in volume upon cycling causes large mechanical stress and fracturing of silicon particles
• Results in loss of electrical contact with electrode matrix and severe capacity fading
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A Partial Solution: Silicon Nanoparticles
Expansion of silicon particles
Loss of electrical contact due to shifting
• Nanoscale particles mitigate problems with volume expansion
• Repeated cycling still leads to loss of electrical contact
Charging
Discharging
Traditional Polymer Binder
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The Solution: Conductive Polymer Binder
Charging
Discharging
Charging
Discharging
• Flexible, conductive polymer binder binds to silicon tightly
• Minimizes loss of electrical contact
Traditional Polymer Binder LBNL Polymer Binder
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Opportunities for Silicon Anode in Diverse Markets
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Commercial Opportunities for Silicon Anode
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The Race is On: Panasonic Developing Silicon Anode for 2012
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Competitive Advantage
SIMPLE & SCALABLE
INEXPENSIVE
DROP-IN TECHNOLOGY
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Competitive Advantage
Incumbents Start Ups
SIMPLE & SCALABLE
INEXPENSIVE
DROP-IN TECHNOLOGY
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Competitive Advantage
• LBNL Polymer Binder can be produced at equivalent cost to traditional binders
• Silicon nanoparticles can be made from metallurgical grade (~98% purity) Si
• Metallurgical grade Silicon available at $1 – $5 per kg
• Anticipated cost parity if Silicon nanoparticles procured for $300 per kg
Economies of Scale Vertical Integration Strategic Partnerships
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SIMPLE & SCALABLE
INEXPENSIVE
DROP-IN TECHNOLOGY
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Competitive Advantage
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SIMPLE & SCALABLE
INEXPENSIVE
DROP-IN TECHNOLOGY
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The Technology is Ready for Your Input. License It. Improve It. Sell It.
Status Goal
Intellectual Property
• Provisional patent on polymer class and battery system • PCT to be filed shortly
• Complete prosecution • Build IP portfolio around optimized technology
Coulombic Efficiency • 99.0% efficiency
• 99.93% efficiency for personal electronics • 99.996% efficiency for electric vehicles
Cycling • 100 cycles at 1200 mAh/g with no capacity fade
• > 300 cycles for personal electronics • > 5000 cycles for electric vehicles
Nanoparticle Optimization
• No systematic testing completed
• Optimize particle size and purity • Investigate scalable nanoparticle production
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PERSONAL ELECTRONICS
ELECTRIC VEHICLES DEFENSE
APPLICATIONS POWER TOOLS
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Team Members
Blake Brundidge, MBA ‘11, Haas School of Business
Morgan Hague, JD ‘11, UC Berkeley Law School
Abraham Ringer, MPH ‘10, UC Berkeley School of Public Health
Alexander Teran, PhD ’13, Chemical Engineering, UC Berkeley
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