查找使用阿拉丁产品的科研文献

Sandwiched composite electrolyte with excellent interfacial contact for high-performance solid-state sodium-ion batteries

Wenting Wang,Wenyong Yuan,Zhongjun Zhao,Pengfei Zhou,Pengju Zhang,Minghui Ding,Jiahai Bai,Junying Weng

Solid-state sodium-ion batteries have attracted significant attention due to their rich resources, high safety, and high energy density. However, the lower ionic conductivity and inferior interfacial contact between solid-state electrolytes (SSEs) and electrodes limit their practical applications. Herein, polyvinylideneuoride- co -hexauoropropylene (PVDF-HFP) membrane is selected and a novel sandwiched composite PVDF-HFP/Na 2.5 Zr 1.95 Ce 0.05 Si 2.2 P 0.8 O 11.3 F 0.7 /PVDF-HFP (G-NZC0.05SPF0.7-G) SSEs is well designed. The ionic conductivity of Na 3 Zr 2 Si 2 PO 12 is enhanced by Ce 4+ /F − co-doping. The effects of Ce 4+ and F − doping on the crystal structure, density, and ionic conductivity for Na 3 Zr 2 Si 2 PO 12 are well investigated. The optimal NZC0.05SPF0.7 delivers a high ionic conductivity of 1.39 × 10 −3 S cm −1 at 25 ℃. Moreover, the PVDF-HFP membrane can significantly enhance the interface compatibility between NZC0.05SPF0.7 and electrodes. The as-prepared G-NZC0.05SPF0.7-G exhibits a large ionic conductivity of 1.07 × 10 −3 S cm −1 at 25 ℃, wide electrochemical stability window up to 4.5 V, high critical current density of 1.2 A cm −2 , and stable Na plating/stripping over 600 h at 0.3 A cm −2 . The solid-state Na 0.67 Mn 0.47 Ni 0.33 Ti 0.2 O 2 /G-NZC0.05SPF0.7-G/Na battery delivers a remarkable cycling stability and rate capability at 25 ℃, indicating that the as-prepared G-NZC0.05SPF0.7-G has a promising application for solid-state SIBs. This study demonstrates an effective strategy to develop advanced solid-state electrolytes for solid-state SIBs.