Improvement of cycle performance of all-solid-state lithium ion batteries with clustered composite electrodes using PTFE powder
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Cycle performance is a technical challenge for the all-solid-state lithium ion battery because of contact loss between the activematerials and solid electrolytes. Providing an intimate adhesive contact between solid electrolyte and active materials mightbe the most effective and practical solution. To address this issue, we added PTFE powder to the composite cathode in orderto create good conducting paths for Li ions and electrons of the lithium batteries. We show the PTFE added composite cathodehas significantly better cycle performance. Electrochemical impedance spectroscopy suggests that the charge transferresistance increased as the amount of PTFE powder increased. On the other hand, differential capacity vs. voltage profilesshowed that polarization of the composite cathode was suppressed as cycle number increased in the PTFE added composites. A preliminary model is suggested to guide future development of the microstructure in all-solid-state batteries.
Abstract
Cycle performance is a technical challenge for the all-solid-state lithium ion battery because of contact loss between the activematerials and solid electrolytes. Providing an intimate adhesive contact between solid electrolyte and active materials mightbe the most effective and practical solution. To address this issue, we added PTFE powder to the composite cathode in orderto create good conducting paths for Li ions and electrons of the lithium batteries. We show the PTFE added composite cathodehas significantly better cycle performance. Electrochemical impedance spectroscopy suggests that the charge transferresistance increased as the amount of PTFE powder increased. On the other hand, differential capacity vs. voltage profilesshowed that polarization of the composite cathode was suppressed as cycle number increased in the PTFE added composites. A preliminary model is suggested to guide future development of the microstructure in all-solid-state batteries.
참고문헌 (14)
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