In-situ polymerized composite polymer electrolyte with cesium-ion additive enables dual-interfacial compatibility in all-solid-state lithium- metal batteries

Solid composite polymer electrolytes (CPEs) that combine the advantages of inorganic and organic electrolytes are regarded as the most appealing candidates for all-solid-state lithium-metal batteries (ASSLMBs). Nonetheless, the interfacial incompatibility issues resulting from poor cathode/electrolyte contact and uncontrolled dendrite growth on Li anode are fundamentally challenging for the development of ASSLMBs. Herein, we design a solid CPE with dual-interface compatibility based on in-situ thermal polymerization of a precursor solution containing polymer monomer, cesium-ion (Cs+), and inorganic Li+ conductor. The resultant Cs+ containing CPE creates intimate interface contact with the cathode while achieving high interfacial stability with the Li-metal anode. Accordingly, this solid electrolyte can perform reversible Li plating/stripping over 750 h at 0.3 mA cm( -2) and a critical current density (CCD) of 0.8 mA cm( -2), in sharp contrast with its Cs+-free counterpart (failure after 11 h and a CCD of 0.5 mA cm( -2)). Furthermore, the full ASSLMBs (Li|LiFePO4) enable decent capacity retention of 90% over 100 cycles at 0.5C and high Coulombic efficiency of nearly 100%. Therefore, constructing solid-state electrolytes with dual-interfacial compatibility may be an effective avenue to achieve high-performance ASSLMBs. (C)& nbsp;& nbsp;2022 Elsevier Inc. All rights reserved.& nbsp;

Automated summary

A solid composite polymer electrolyte with dual-interface compatibility is designed to address the interfacial incompatibility issues and uncontrolled dendrite growth in all-solid-state lithium-metal batteries. It exhibits high performance in reversible lithium plating/stripping and long-term cycling stability, indicating the effectiveness of constructing solid-state electrolytes with dual-interfacial compatibility.