Sample interview questions: Can you discuss your understanding of the challenges and opportunities of using polymers in lithium-ion batteries?
Sample answer:
Challenges of Using Polymers in Lithium-Ion Batteries:
- Low Ionic Conductivity:
-
Polymers typically possess lower ionic conductivity compared to inorganic solid electrolytes like ceramics, hindering the efficient movement of lithium ions during battery operation.
-
Electrochemical Stability:
-
Polymers may undergo degradation or decomposition upon contact with the lithium metal anode, causing capacity loss and safety concerns.
-
Interfacial Compatibility:
-
Ensuring good interfacial compatibility between the polymer electrolyte and the battery electrodes is crucial to minimize interfacial resistance and maintain long-term stability.
-
Mechanical Properties:
-
Polymers used in lithium-ion batteries need to possess adequate mechanical strength and flexibility to withstand the volume changes that occur during battery cycling.
-
Processing and Manufacturing Challenges:
- The synthesis, processing, and manufacturing of polymer electrolytes can be complex, requiring specialized techniques and facilities.
Opportunities of Using Polymers in Lithium-Ion Batteries:
- Enhanced Safety:
-
Polymer electrolytes can offer improved safety compared to liquid electrolytes, as they exhibit lower flammability and reduced risk of leakage.
-
Energy Density:
-
Polymers enable the use of high-energy-density cathode materials, such as nickel-rich NMC or cobalt-free cathodes, leading to potentially higher battery capacity.
-
Form-Factor Flexibili… Read full answer