环氧乙烷
电解质
离子电导率
电化学
钠
无机化学
化学
锂(药物)
热稳定性
氧化物
阴极
玻璃化转变
材料科学
聚合物
化学工程
共聚物
复合材料
物理化学
内分泌学
工程类
医学
冶金
电极
作者
Xiangdong Qi,Qiang Ma,Lilu Liu,Yong‐Sheng Hu,Hong Li,Zhibin Zhou,Xuejie Huang,Liquan Chen
标识
DOI:10.1002/celc.201600221
摘要
Abstract Sodium‐ion batteries (SIBs), a promising substitute for lithium‐ion batteries (LIBs), are considered to have the potential to be employed in large‐scale energy storage systems with lower cost and enhanced safety as primary concerns. Solid polymer electrolyte (SPE)‐based SIBs will more likely meet these demands, because of their good flame resistance and excellent flexibility compared with conventional organic liquid‐electrolyte‐based SIBs. Here, we describe an SPE composed of sodium bis(fluorosulfonyl)imide (NaFSI) and poly(ethylene oxide) (PEO). The NaFSI/PEO (molar ratio of EO/Na + =20) blended polymer electrolyte exhibits a low glass transition temperature (i.e. −37.9 °C), relatively high ionic conductivity (i.e. ≈4.1×10 −4 S cm −1 at 80 °C), and enough electrochemical and thermal stability for application in SIBs. Most importantly, the NaFSI/PEO blended polymer electrolyte displays excellent interfacial stability with Na metal in Na/Na cells and good cycling performance in prototype cells with Na 0.67 Ni 0.33 Mn 0.67 O 2 as the cathode material. All of these properties make NaFSI‐based SPEs promising candidates for use in SIBs.
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