investigation of high performance nano-solutions for si based … · 2017-09-19 · investigation...
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![Page 1: Investigation of High Performance Nano-Solutions for Si based … · 2017-09-19 · Investigation of High Performance Nano-Solutions for Si based Anodes 1 Vinay Bhat, PhD –Principal](https://reader033.vdocument.in/reader033/viewer/2022042319/5f09438a7e708231d425fd1a/html5/thumbnails/1.jpg)
Investigation of High Performance Nano-Solutions for Si based Anodes
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Vinay Bhat, PhD – Principal ScientistSeptember 2017
Manufacturing/R&D
Sales & Support
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Typical Silicon Anodes: Poor Cycle Life Challenge
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Fresh electrode During formation After cycling
Si Si
LixSiy
• Lithiated particles lose electrical contacts causing irreversible Li loss• Stress in electrode bounce back and continuous impedance build-up• SEI formation on fresh fractured surface Li loss
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Addressing the Challenge
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Si-M
ater
ial Reduce vol. expansion
• Alloys• OxidesControl morphology
Tougher binders• New class rubbers• New polymers (Eg: LiPAA, PAN)• Cross-linkers
Stable SEI forming electrolytes• Fluorinated solvents• New salts• New additives
Maintain intra-particle connectivityAbsorb stress due to expansion
Coating on active materialControlled electrode design
Carbon Black Carbon Nanotubes
Graphite/Hard CarbonGraphene
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Effective Use of CNT
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Commercial CNT
• Acts as particle/agglomerate• No full advantage of 1D structure of CNT
XP01/XP20: Dispersed CNTMOLECULAR REBAR® technology
• Better interaction with active particles
XP29: Dispersed-Modified CNTMOLECULAR REBAR® enhanced technology
• Strong interaction with binder, SiOx and SiA• Improve toughness of binder• Maintain contact with active particles
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ControlControl CB 2.4%Control CB 2.4%
XP20 1%
Control CB @ 2.4%
XP20 @ 1%
XP29 @ 1%
Influence of Different Carbons
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• Cycle life is a challenge in Si-based anodes
• CB improved conductivity improve cycle life
• Dispersed CNT provides toughness and conductivity
• Dispersed-Modified CNT in addition brings strong chemical interaction with binder and Si-based materials
Strong interactions between Silicon based materials, binders, & CNT are critical to achieve improved performance
• SiOx(20%)-Gr//NCM• Anode loading: ~10 mg/cm²• Cathode: 4.2 mAh/cm²• FEC based electrolyte
• Al clad Coin cell• V Range: 2.7 – 4.2V• Rate: 0.5C+CV Charge & 1C discharge• Temperature: Room T
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Compatibility with Different Binder and Si Systems
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Our Solutions can enable Silicon based Anodes!
Test conducted with JSR TRD105A SBR binder
SiOx Si-Alloy
CMC/SBR based 100% >300%
LiPAA based >100% >50%
Relative cycle life improvement with our solutions:
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Confidential Information of Black Diamond Structures, LLC
Who We Are
Black Diamond Structures, a developer, manufacturer, and marketer of innovative nanomaterial products and solutions based on revolutionary carbon nanotube (CNT) technology, MOLECULAR REBAR®
Our Partners
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How to reach us:
Jun Liu – Market Segment [email protected] (Office)
Vinay Bhat PhD – Principal [email protected] (x210) (Office)
Dr. Jerzy Gazda – Director, [email protected] (x209) (Office)
Tim Knaus – Vice President, Global [email protected] (Office)
Dru Kefalos – Chief Marketing [email protected] (Office)
1505Visit us at booth