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

© 2018 The Electrochemical Society. The scalable multifunctional solid electrolyte (MSE) composed of poly(ethylene oxide)-solid oxide lithium-ion conductor Li7La3Zr2O12-succinonitrile (PEO18-LiTFSI-LLZO-SN) is demonstrated as a promising candidate for high performance all-solid-state batteries. Among these electrolytes, PEO18-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.