In-situ preparation of tightly Contacting 3D fiber network composite electrolytes for high-performance all-solid-state lithium batteries

The current quest for high-performance energy storage devices has spurred considerable progress in the development of all-solid-state lithium batteries (ASSLBs). Within this domain, the ultimate goal remains the achievement of high ionic conductivity, good interfacial contact and stability. In this paper, an electrospinning process was employed to construct a 3D ceramic nanofiber composite matrix electrolyte directly on the surface of LiFePO4 (LFP) cathode. Subsequently, an ultra-thin solidified nanofiber electrolyte (ISSNE), exhibiting good interfacial contact characteristics, was fabricated through the in-situ solidified of 1,3-dioxolane (DOL) onto the nanofiber scaffold. Moreover, the in-situ constructed electrode-electrolyte interface not only enables a tighter contact between the nanofiber membrane and the cathode but also promotes uniform lithium accretion and effectively suppresses the growth of lithium dendritic structures. ASSLBs assembled with the ISSNE composite cathode can cycle stably for 1000 hat 0.1 mA/cm2 and the capacity retention rate is also 98.3 % after 200 cycles. This study demonstrates that batteries with the ISSNE composite cathode possess high electrochemical performance and good stability. This strategy offers a new approach to improving the contact between the cathode- electrolyte interfaces.