Silicon battery Presentation - Lithium Ion

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The document discusses a conductive polymer binder developed at LBNL that can be used in silicon anode lithium-ion batteries. Silicon offers a much higher theoretical capacity than traditional graphite anodes, but its large volume changes during charging/discharging can lead to capacity fading. The novel binder is flexible and conductive, allowing it to tightly bind silicon nanoparticles and maintain electrical contact through the volume changes. This overcomes challenges facing silicon anodes and enables their use in applications like electric vehicles to significantly increase energy density. The technology has potential for commercialization and competition with other companies working on silicon anode solutions.

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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 CathodeElectrolyte
Li+
e-
Current Collectors
2

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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
SpecificCapacity(mAh/g)
Li-Ion Anode Materials
•  Silicon offers 12x improvement in theoretical capacity over graphite
4

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Silicon Anodes Drastically Increase Energy Density
5

$LastModified24.02.201019:15:23PacificStandardTimePrinted | Challenge of Silicon Anodes 6 •  Large change in volume upon cycling causes large mechanical stress and fracturing of silicon particles •  Results in loss of electrical contact with electrode matrix and severe capacity fading$

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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
12

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Competitive Advantage
Incumbents Start Ups
SIMPLE &
SCALABLE
INEXPENSIVE
DROP-IN
TECHNOLOGY
13

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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
15
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
16

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PERSONAL
ELECTRONICS
ELECTRIC
VEHICLESDEFENSE
APPLICATIONS
POWER
TOOLS
17

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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
18

This document discusses lithium ion batteries with silicon anodes as an improvement over traditional graphite anodes. Silicon can store 10 times more lithium than graphite, offering higher energy density and capacity. However, silicon's large volume changes during charging cause cracking issues. Researchers are using silicon nanowires which can accommodate these changes without breaking. Silicon nanowire battery electrodes provide good performance with high capacity and long cycle life. Potential applications of lithium ion silicon anode batteries include consumer electronics, electric vehicles, and stationary energy storage.

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1. LastModified24.02.201019:15:23PacificStandardTimePrinted | Polymer Binder for Silicon Anode Inventor: Dr. Gao Liu, PhD Presentation by: Blake Brundidge Morgan Hague Abraham Ringer Alexander Teran 1

2. LastModified24.02.201019:15:23PacificStandardTimePrinted | Lithium-Ion Batteries •  Convert electrochemical energy to electricity •  High energy density compared to other chemistries Anode CathodeElectrolyte Li+ e- Current Collectors 2

3. LastModified24.02.201019:15:23PacificStandardTimePrinted | Slow Progress in Lithium-Ion Batteries 3

4. LastModified24.02.201019:15:23PacificStandardTimePrinted | 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 SpecificCapacity(mAh/g) Li-Ion Anode Materials •  Silicon offers 12x improvement in theoretical capacity over graphite 4

5. LastModified24.02.201019:15:23PacificStandardTimePrinted | Silicon Anodes Drastically Increase Energy Density 5

6. LastModified24.02.201019:15:23PacificStandardTimePrinted | Challenge of Silicon Anodes 6 •  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

7. LastModified24.02.201019:15:23PacificStandardTimePrinted | 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 7

8. LastModified24.02.201019:15:23PacificStandardTimePrinted | 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 8

9. LastModified24.02.201019:15:23PacificStandardTimePrinted | Opportunities for Silicon Anode in Diverse Markets 9

10. LastModified24.02.201019:15:23PacificStandardTimePrinted | Commercial Opportunities for Silicon Anode 10

11. LastModified24.02.201019:15:23PacificStandardTimePrinted | The Race is On: Panasonic Developing Silicon Anode for 2012 11

12. LastModified24.02.201019:15:23PacificStandardTimePrinted | Competitive Advantage SIMPLE & SCALABLE INEXPENSIVE DROP-IN TECHNOLOGY 12

13. LastModified24.02.201019:15:23PacificStandardTimePrinted | Competitive Advantage Incumbents Start Ups SIMPLE & SCALABLE INEXPENSIVE DROP-IN TECHNOLOGY 13

14. LastModified24.02.201019:15:23PacificStandardTimePrinted | 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 14 SIMPLE & SCALABLE INEXPENSIVE DROP-IN TECHNOLOGY

15. LastModified24.02.201019:15:23PacificStandardTimePrinted | Competitive Advantage 15 SIMPLE & SCALABLE INEXPENSIVE DROP-IN TECHNOLOGY

16. LastModified24.02.201019:15:23PacificStandardTimePrinted | 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 16

17. LastModified24.02.201019:15:23PacificStandardTimePrinted | PERSONAL ELECTRONICS ELECTRIC VEHICLESDEFENSE APPLICATIONS POWER TOOLS 17

18. LastModified24.02.201019:15:23PacificStandardTimePrinted | 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 18

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