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KTH ROYAL INSTITUTE OF TECHNOLOGY Electrochemical Characterization of Li-ion Batteries for Hybrid Application Ageing Study Abdilbari Shifa Mussa, Rakel.

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Presentation on theme: "KTH ROYAL INSTITUTE OF TECHNOLOGY Electrochemical Characterization of Li-ion Batteries for Hybrid Application Ageing Study Abdilbari Shifa Mussa, Rakel."— Presentation transcript:

1 KTH ROYAL INSTITUTE OF TECHNOLOGY Electrochemical Characterization of Li-ion Batteries for Hybrid Application Ageing Study Abdilbari Shifa Mussa, Rakel Wreland Lindström, Mårten Behm, Göran Lindbergh

2 Li-ion Battery Works by shuttling lithium ions between the two electrodes Lithiated metal oxides: LCO, LFP, LMO, NMC etc... Shuttling doesn’t continue indefinitely without loosing performance Lithium ion battery during charging operation Adapted from department-of0.html - Graphite + Lithiated metal oxides Electrolyte

3 Ageing Capacity and power fade with time and use. Temperature, C-rate, DOD, SOC are the main factors of ageing Life time is a challenge for batteries in vehicles!! ( Klett et. al, Journal of power sources 257 (2014) ) c) Hybrid Electric Vehicle Cycle Constant Current Cycle

4 How the battery age? Jens Groot, Main ageing mechanisms in Li-ion battery, 2012 Complex set of ageing mechanisms due to multiple interactions Complementary charcterization techniques and models needed

5 Electrochemical Characterization Using electrochemical techniques to observe changes in parametres affecting the performance with ageing Charge/Discharge cycling - Discharge capacity vs cycle number - Coulombic efficiency (CE) - Differential voltage (dV/dQ vs Q plot) etc... Potentiostatic test

6 Charge/Discharge Cycling High precission battery cycler experimental set up

7 Charge/Discharge Cycling dV/dQ vs Q State analysis Quantitative determination of active electrode mass and lithium loss K.Honkura, ECS Transactions, 13 (19) (2008) V cell Cell voltage V c Cathode half cell voltage V a Anode half cell voltage Q c Cathode half cell capacity Q a Anode half cell capacity Cathode Slippage a Anode Slippage S= a - c ma anode active mass (cell) mc cathode active mass (cell)

8 Potentiostatic test The cathodic current is an indication of a continuous reduction at the graphite probably due to SEI layer development. Generally, lower state of charge gives lower side reaction rate. The growth of SEI deviates from a parabolic rate law for higher % SOC. How side reaction rate depends on state of charge (SOC)?

9 Summary and Future works Ageing of lithium ion battery is a challenge being very complex. Need for complementary models and characterization techniques to determine aging rates and mechanisms. Future additional works: Physics based models for performance prediction and ageing. Electrochemical Impedance Spectroscopy (Model and Experiment).

10 Tack för uppmärksamheten!


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