Low-pressure Dendrite-free Sulfide Solid-state Battery with 3D LiSi@Li-Phen-Ether Anode

Lithium-metal batteries with solid electrolytes (SEs) have emerged as promising electrochemical energy storage devices due to high energy density and safety. However , inherent challenges of deleterious lithium dendrite growth and poor interfacial stability hinder their practical application. Herein , a new type of room-temperature liquidous Li metal arene complex—Li-Phenanthrene (Phen)-Ether is explored to enable a 3D LiSi@Li-Phen-Ether (3D LSLL) anode with low cost, high safety and high ion/electron-conductivity. Symmetric cells with sulfide SE and 3D LSLL anode deliver an ultra-high critical current density (> 13 mA cm −2 ) and long cycle life (> 1000 h, 0.25 mA cm −2 ). Moreover, full battery (LFP/sulfide SE/3D LSLL) can operate at low-external pressure (0.5 MPa) and ambient temperature by introducing a flexible cathode/sulfide interlayer with high ion conductivity (2 mS cm −1 ). This unprecedented battery configuration demonstrates high-rate (2C) performance and long cycle life (over 300 cycles), which exceeds preciously-reported sulfide SE/lithium batteries at low stack pressures, and may open up a promising route for high-energy-density, cost-effective and safe rechargeable lithium batteries.