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

作者：Chen, Ze; Ma, Xinyao; Hou, Yue; Cui, Huilin; Li, Xinliang; Yang, Qi; Huang, Zhaodong; Wang, Donghong; Dong, Binbin; Fan, Jun^*; Zhi, Chunyi^*

来源：Advanced Functional Materials, 2023, 33(23).

DOI：10.1002/adfm.202214539

• compatibilizers
• flexible batteries
• polymer electrolytes
• solid batteries

Polymer blends based solid polymer electrolytes (SPEs), combining the advantages of multiple polymers, are promising for the utilization of 5 V-class cathodes (e.g., LiCoMnO4 (LCMO)) with enhanced safety. However, severe macro-phase separation with defects and voids in polymer blends restrict the electrochemical stability and ionic migration of SPEs. Herein, inorganic compatibilizer polyacrylonitrile grafted MXene (MXene-g-PAN) is exploited to improve the miscibility of the poly(vinylidene fluoride-co-hexafluoropropylene) (PVHF)/PAN blends and suppress the consolidation of phase particles. The resulting SPE exhibits a high anodic stability with an ionic conductivity of 2.17 x 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 discharge voltage with a decent capacity (131 mAh g(-1)) and cycling performance. Subsequently, the solid all-in-one graphite||LCMO battery is also constructed to extend the application of MXene based SPEs in flexible batteries. Benefiting from the interface-less design, outstanding mechanical flexibility and stability is achieved in the battery, which can endure various deformations with a low-capacity loss (< approximate to 10%). This study signifies a significant development on 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.

• 单位
  郑州大学