Tailoring Practical Solid Electrolyte Composites Containing Ferroelectric Ceramic Nanofibers and All-Trans Block Copolymers for All-Solid-State Lithium Metal Batteries
Shuhui Ge, Jiawei Wu, Rui Wang, Liang Zhang, Shujie Liu, Xianda Ma, Kun Fu, Jianhua Yan, Jianyong Yu, Bin Ding
Abstract
Ion transport efficiency, the key to determining the cycling stability and rate capability of all-solid-state lithium metal batteries (ASSLMBs), is constrained by ionic conductivity and Li + -migration ability across the multicomponent phases and interfaces in ASSLMBs. Here, we report a robust strategy for the large-scale fabrication of a practical solid electrolyte composite with high-throughput linear Li + -transport channels by compositing an all-trans block copolymer PVDF- b -PTFE matrix with ferroelectric BaTiO 3 –TiO 2 nanofiber films. The electrolyte shows a sustainable electromechanical-coupled deformability that enables the rapid dissociation of anions with Li + to create more movable Li + ions and spontaneously transform the battery internal strain into Li + -ion migration kinetic energy. The ceramic framework homogenizes the interfacial potential with electrodes, endowing the electrolyte with a high conductivity of 0.782 mS·cm –1 and stable ion transport ability in ASSLMBs at room temperature. The batteries of LiFePO 4 /Li can stably cycle 1000 times at 0.5 C with a high capacity retention of 96.1%, and Ah-grade pouch or high-voltage Li(Ni 0.8 Mn 0.1 Co 0.1 )O 2 /Li batteries also exhibit excellent rate capability and cycling performance.