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Grafted MXenes Based Electrolytes for 5V-Class Solid-State Batteries

机译：Grafted MXenes Based Electrolytes for 5V-Class Solid-State Batteries

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摘要

Polymer blends based solid polymer electrolytes (SPEs), combining theadvantages of multiple polymers, are promising for the utilization of 5 V-classcathodes (e.g., LiCoMnO_4 (LCMO)) with enhanced safety. However, severemacro-phase separation with defects and voids in polymer blends restrictthe electrochemical stability and ionic migration of SPEs. Herein, inorganiccompatibilizer polyacrylonitrile grafted MXene (MXene-g-PAN) is exploitedto improve the miscibility of the poly(vinylidene fluoride-co-hexafluoropropylene)(PVHF)/PAN blends and suppress the consolidation of phaseparticles. The resulting SPE exhibits a high anodic stability with an ionicconductivity of 2.17 × 10~(?4) S cm~(?1), enabling a stable and reversible Li platting/stripping (over 2500 h). The fabricated solid Li‖LCMO cell delivers a 5.1 V dischargevoltage with a decent capacity (131 mAh g~(?1)) and cycling performance.Subsequently, the solid all-in-one graphite‖LCMO battery is also constructedto extend the application of MXene based SPEs in flexible batteries. Benefitingfrom the interface-less design, outstanding mechanical flexibility andstability is achieved in the battery, which can endure various deformationswith a low-capacity loss (< ≈10%). This study signifies a significant developmenton solid flexible lithium ion batteries with enhanced performance,stability, and reliability by investigating the miscibility of polymer blends,benefiting for the design of high-performance SPEs.

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