Ti3C2T MXene enhanced PEO/SN-based solid electrolyte for high-performance Li metal battery

• We report a Ti 3 C 2 T x enhanced polymer electrolyte with a stable interface and high Li + conductivity (2.17 × 10 −3 s cm −1 , 35 °C). • The side effects between Li anode and Succinonitrile (SN) are inhibited and the Li + conduction is accelerated by the groups on Ti 3 C 2 T x surface. • Assembled Li||Li symmetric batteries and LiFePO 4 ||Li full batteries show excellent cycling stability at 28 °C and −5 °C. • This work provides a simple, feasible, and scalable strategy for solid-state Li metal batteries (SSLMBs). Succinonitrile has shown significant promise for application in polymer electrolytes for solid-state lithium metal batteries due to its high ionic conductivity at low-temperature. However, the use of Succinonitrile is limited due to its corrosion of Li metal. Herein, we report a solid polymer electrolyte with high ionic conductivity (2.17 × 10 −3 S cm −1 , 35 °C) enhanced by Ti 3 C 2 T x . Corrosion of the Li anode is prevented due to the Succinonitrile molecules being efficiently anchored by Ti 3 C 2 T x . Meanwhile, the coordination environment of Li + is weakened due to the introduction of competitive coordination induction effects into the polymer electrolyte, resulting in efficient Li + conduction. Furthermore, the mechanical properties of the electrolyte are enhanced by modulating the ratio of Ti 3 C 2 T x to suppress the growth of Li dendrites. Therefore, Li||Li symmetric batteries deliver stable cycling up to 8000 h at 28 °C. LiFePO 4 ||Li full batteries exhibit excellent cycling stability of 151.7 mAh g −1 with a capacity retention of 99.3 % after 300 cycles. This work not only presents a new idea to suppress the corrosion of the Li anode by Succinonitrile but also provides a simple, feasible, and scalable strategy for high-performance Li metal batteries .