Value Proposition for MicroGrid Expanded Metal Current Conducting Foil in Li-ion Cells

Transcription

1 NAATBATT Conference March 2016 Value Proposition for MicroGrid Expanded Metal Current Conducting Foil in Li-ion Cells Presented By: John Hart Business Development Manager Power Technologies

2 MicroGrid Expanded Metal Company Description Manufacture Precision Expanded Metal Foils & Polymers Established In 1948 Specializing In Thin Metal Foils & Polymers Custom Designed & Built Expanding Equipment & Tooling Micro Mesh Materials Fine Metal Foils & Polymers - > 25 Micron -.6mm ( ) Opening Sizes -> 25 Micron 12mm ( ) Primary Market Segments Battery & Fuel Cell Aerospace Lightning Strike Protection Filtration EMI/RFI Shielding Note: Dexmet Does Not Perform Any Internal Testing With Electrode Materials Performance and Cycle Life Data is Provided by Clients & Independent Labs

3 MicroGrid Expanded Metal Overview of Expanded Materials How Expanded Material is Made Ductile Material Being Expanded Tool Geometry / Profile Tool Travel (Stroke) Materials Are Produced Through A Simultaneous Slit and Stretch Process Solid Roll or Sheet Stock of Virtually Any Ductile Metal or Polymer Expanded Terminology LWD = Long Way of the Diamond SWD = Short Way of the Diamond Strand Width = Material Thickness Between Openings (Controlled By Feed Rate) Overall Thickness Strictly Private and Confidential 3

4 MicroGrid Expanded Metal Overview of Expanded Materials Expanded Material is Highly Configurable Each characteristic can be altered to meet specific application requirements

5 MicroGrid Development Testing Third Party Results Frontier Applied Sciences and Technologies, LLC 5

6 MicroGrid Development Testing Third Party Results Si Anode Study Si Anode on Standard 10 Micron Cu Solid Foil vs. 25 Micron Microgrid Next Phase of Testing 2Ah Pouch Cells 6

7 MicroGrid Development Testing Third Party Results 30% Gain in Capacity With MicroGrid vs. Industry Standard Solid Foil 7

8 MicroGrid Development Testing Third Party Results Lithium Anode Study Li-Plated Standard 10 Micron Cu vs. 25 Micron Cu MicroGrid Commercial Cathode Materials. C-Rate 0.7 Charge and 0.5 Discharge 8

9 MicroGrid Development Testing Third Party Results Ningbo Institute of Material Technology, China Graph (b) the charging/discharging performance of full cells with graphite anode on solid Cu foil, and cathode on solid Al and Microgrid (M) 5C and 10C Graph (f) The charging/discharging performance of the full-cell at 10C with anode and cathode on solid foil and on Microgrid (M) current collectors. Full Cells Produced with NMC and Graphite All Materials Consistent with Exception for Current Conductor Foils 20 Micron Solid Foil vs. 25 Micron MicroGrid Expanded Foil 9

10 MicroGrid Performance Enhancements Potential For Reducing Capacity Fade Cell Layers with Solid Current Conduction Foil During overcharge or over-discharge electrolyte decomposition, passive film formation, active material dissolution, among other phenomena can cause capacity fade. With solid foil each cell layer can become weakest link in the series. A porous current conductor enables the cell to fully saturate all layers supplying ions where needed to reduce the potential for capacity fade thus having more electrolyte and Li-ion availability for equilibrium throughout the cell Cell layers with MicroGrid Current Conduction Foil 10

11 MicroGrid Performance Enhancements Reduced De-Lamination Increases Cycle Life Electrode Cu Foil Increased Cycle Life The MicroGrid Foil Has Up To 1800 Openings Per Sq. In 1,800 Chemical Bonds Between The Two Sides Of The Coated Foil There Are 1,800 Chemical Bonds Between The Two Sides of The Coated Foil to Reduce De-Lamination Between Electrode Materials and Foil Extends Cycle Life and Reduces Dependence on Binder 11

12 MicroGrid Production Enhancements Single Pass Dual Sided Coating Decreased Processing Time/Reduced De-Lamination Top Surface Photo Courtesy of Megtec Systems Inc. Proof of Concept: Electrode Slurry Injected To The Underside of The Foil and Pushed Through To Top Surface. Dual Sided Coating In Single Pass No Laminate Backing Required Potential To Dial In Parameters For Balanced Coating On Both Sides 12

13 MicroGrid Production Enhancements Reducing Formation Time Increasing Productivity Soaking And Formation To Saturate Electrolyte Throughout The Electrode Chemistry Can Be A Significant Rate Limiting Step In The Automated Production Of Cells. MicroGrid Enables Faster Equilibrium Throughout The Cell 13

14 MicroGrid Expanded Metal Value Proposition Overview of Performance Considerations Potential For A Significant Increase In Capacity At Higher C-Rates Initial Testing Shows Potential For Higher Available Capacity at Higher C-Rates OR - Reduced Loading To Achieve The Same Capacity Less weight in Si anode battery Potential For Reduced De-Lamination At Current Conductor/Electrode Interface Better Chemical Bonding To the Electrode Using An Open Area Product Extending Cycle Life And Potential Reduction In Use Of Binder Potential Reduction In Capacity Fade The Porous Foil Allows Li Ions and Electrolyte To Completely Saturate The Multiple Layers Within A Cell Reduced Electrolyte Decomposition, Passive Film Formation, Active Material Dissolution And Other Phenomena Caused By Overcharge And Over Discharge Potential To Buffer The Pulverizing Effects Between Si-Particles At The Foil/Electrode Interface The Porous Mesh Is Not Rigid Like Solid Foil Allowing Some Stress Relief Which May Reduce The Amount of Pulverization At The Foil/Electrode Interface Potential For Increased Battery Life Marked Increase In Cycle Life By Reducing Capacity Fade and De-Lamination 14

15 MicroGrid Expanded Metal Value Proposition Overview of Performance Considerations Cost Saving Considerations for Production Reduction In Wetting Time For Electrolyte Formation The Porous Mesh Allows The Electrolyte To Quickly Saturate The Entire Cell With Electrolyte Potential For Single Pass Double Sided Coating Possibility To Dial In The Proper Injection Parameter To Produce A Double Sided Coating Equal Electrode Thickness On Both Surfaces Significantly Reducing Production Run Time Further Testing Is Needed 15