Design of safe lithium ion batteries require innovations in materials for cathodes, anode and electrolytes. In particular the role of 2D materials can be significant to boost the safety. This presentation provides an overview on the efforts in the PI's lab to design thermally safe high energy density batteries. At first, I will show how the thermal stability of cathodes can be improved by encapsulation of electrode particles within graphene materials. The cyclic performance of commercially cathode electrodes was improved by 100%. We also showed that the surface degradation can be significantly reduced by TEM-EELS measurements. We also will discuss how 2D materials can make the solid electrolytes to cycle better in Li-metal batteries. In particular the enhanced surface interactions of 2D materials can be a major factor to increase salt dissociation resulting in the increase of the concentration of mobile ions to enhance the ion conductivity in solid electrolytes. At the end, I will show the effect of graphene oxide coating on glass fiber separators as a novel means to combat lithium dendrites. We show that GO materials provide efficient pathways facilitiating Li ions. In addition, the mechanical properties of GO is high enough to resist the Li dendrite penetration across the GO layer.

2D materials for electrode, electrolyte, and electrode/electrolyte interfacial design of safe Li batteries

2019 Fall National Meeting

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