• • Crown ether-based polyrotaxane solid electrolytes achieve ionic conductivity of 1.2 × 10⁻⁴ S cm⁻¹ at 30 °C and a Li+ transference number of 0.63, enabling stable cycling of Li||LiFePO4 cells for over 500 cycles with 92% capacity retention (ref. 77). This directly addresses the insufficient room-temperature conductivity of conventional PEO electrolytes (<10⁻⁵ S cm⁻¹), which has stalled commercialization of solid-state lithium metal batteries.
• • Calix[4]pyrrole anion receptors reduce the lithium-ion migration barrier to 0.18 eV and increase the Li+ transference number to 0.78 in composite polymer electrolytes, as demonstrated by solid-state NMR and electrochemical impedance spectroscopy (ref. 84). This anion-centered regulation suppresses space-charge polarization and dendrite growth, offering a pathway to high-rate solid-state cells with enhanced safety.
• • Cyclodextrin-based channel electrolytes exhibit an ionic conductivity of 2.5 × 10⁻⁴ S cm⁻¹ at 25 °C and a lithium-ion diffusion coefficient of 3.1 × 10⁻⁸ cm² s⁻¹, outperforming conventional PEO-based systems by an order of magnitude (ref. 83). The well-defined nanochannels facilitate selective Li+ transport, critical for fast-charging solid-state batteries.
• • Cucurbit[6]uril-based hybrid electrolytes demonstrate a Young's modulus of 1.2 GPa and a lithium dendrite suppression time exceeding 1000 h at a current density of 0.5 mA cm⁻² (ref. 79). This mechanical robustness and interfacial stability are essential for practical lithium metal anodes, where dendrite-induced short circuits remain a primary failure mode.