All-Solid-State Lithium Battery Fitted with Polymer Electrolyte Enhanced by Solid Plasticizer and Conductive Ceramic Filler

The scalable multifunctional solid electrolyte (MSE) composed of poly(ethylene oxide)-solid oxide lithium-ion conductor Li 7 La 3 Zr 2 O 12 -succinonitrile (PEO 18 -LiTFSI-LLZO-SN) is demonstrated as a promising candidate for high performance all-solid-state batteries. Among these electrolytes, PEO 18 -LiTFSI-7.5%LLZO-10%SN presents a highest ionic conductivity of 1.19 × 10 −4 S·cm −1 at room temperature and a much higher Li + transference number. Moreover, this MSE has a good electrochemical stability of 5.5 V vs. Li/Li + , and exhibits excellent interfacial compatibility against lithium electrode. Owing to the improved interface contact and enhanced Li + transference, the MSE-based ASSLBs present outstanding cycling and rate performance at 60°C. Notably, the initial discharge capacity at 1 C is 130.2 mAh·g −1 , and after 500 cycles 80.0% capacity is retained. The cell can be operated normally at lower temperatures (30°C and 45°C) while still delivering a relatively high specific capacity.