Description
Solid electrolytes are promising candidates for safe, high-energy power systems. Composite electrolytes hold the potential to combine high ionic conductivity with stable electrode interfaces. However, a fundamental trade-off often exists between ion conduction and mechanical properties. First, we found that 2D materials show excellent ionic conductivity along 2D channels. Second, we introduce a composite electrolyte design that decouples ion conduction from mechanical flexibility, achieving a high ionic conductivity of 10.2 mS cm-1 at room temperature. The architecture features alternating layers of perpendicularly aligned 2D Li0.3Cd0.85PS3 (PA-LiCdPS) to create continuous superionic conduction pathways and polyethylene oxide (PEO) for flexibility and improved interfacial compatibility. This PA-LiCdPS/PEO electrolyte enables Li||LiNi0.8Co0.1Mn0.1O2 coin cells (stack pressure <0.5 MPa) to have high electrochemical performance. Finally, we have designed and synthesized a sieving 2D solid state organic electrolytes with mixed planes and vertical nanochannels, which can be scaled up and shows high environmental tolerance and temperature stability, for practical solid-state batteries.
