sulin video grab (IMAGE) Penn State Caption Cryo-STEM imagery showing the structural and chemical evolution of silicon and the solid-electrolyte interphase (SEI) layer. After the 36th cycle to the 100th cycle the silicon nanowire expands and becomes irregular, mingling with the SEI to form a soft composite structure. Credit Jennifer M. McCann, Penn State Usage Restrictions non commercial use License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.