Ragone-construction各种锂材料比较Ragone-construction各种锂材料比较.ppt

A Model-based Comparison of Various Li-ion Chemistries Can we compare various Li-ion batteries to each other on a fair basis? Relative Performance of Various Electrochemical Energy-Storage Devices 1 2 4 6 10 2 4 6 100 2 4 6 1000 Specific Energy (Wh/kg) 10 0 10 1 10 2 10 3 10 4 Specific Power (W/kg) Lead-acid Capacitors Fuel Cells IC Engine HEV goal 3.6 s 36 s 0.1 h 1 h 10 h 100 h Ni-MH Li-ion 3.6 s 36 s 0.1 h 1 h 10 h 100 h Acceleration Range EV goal 3.6 s 36 s 0.1 h 1 h 10 h 100 h Source: Product data sheets Goals developed by DOE and USABC Plot provides a means of comparing various systems to each other However, cell design has a significant impact on performance, hence complicating comparison Lead-acid batteries in cars (SLI batteries) thinner than those used for traction charged to 4.5 V Gr/LiNi1/3Co1/3Mn1/3O2 (charged to 4.3 V) Li/V6O13 Li/LiNi1/3Co1/3Mn1/3O2(4.3 V) Gr/LiMn2O4 Gr/LiFePO4 Power assist HEV EV pack goal Acceleration Range This talk will describe the methodology used to make this plot Relative Performance of Various Li-ion Chemistries Procedure for Generating Ragone Plot Develop model for each chemistry 2 anodes and 4 cathodes modeled to-date Perform thermodynamic and rate experiments Half-cell experiments with Li-reference and counter Performed for 1 anode and 3 cathodes Typically performed with varying electrode design Compare model to data to extract unknown parameters Extract with one cell; predict other cells Use model to optimize design to maximize specific energy and compare Combine half-cell models to develop a full-cell model Ensure common basis for various cells Same first-cycle loss and excess anode capacity Same mass of current collectors e.t.c Use models to understand limitations Modeling Approach Lithium-ion Lithium-metal Based on a macro-homogeneous approach Microscopic details (e.g., pore structure) are averaged Models are mechanistic in nature. Include: Mass and charge transport in the porous electrodes Thermod