Explain the concept of solid electrolyte interfaces (SEI) in batteries by answering the following points: a) Define the solid electrolyte interface (SEI). [5 marks] b) Which factors in battery electrodes will influence the SEI formation? Explain why. [5 marks] c) Explain how SEI relates to the choice of electrolytes. What are the ideal properties of an electrolyte to form a good SEI? [5 marks] d) Draw a schematic diagram illustrating the SEI formation in a Li ion battery with graphite as anode, LiCoO2 as cathode and LiCIO4 in EC/DMC (ethylene carbonate/dimethylcarbonate) as electrolyte. Then draw a schematic diagram under the first one and use it to explain how the SEI will change if the salt changes to LiPF6 and FEC (fluoroethylene carbonate) is added to EC/DMC. [8 marks] e) Which of the two situations described in Q1 (d) will be a more desirable SEI and why? [2 marks]