分离器(采油)
材料科学
电解质
多孔性
钠离子电池
钠
离子电导率
热稳定性
电化学
化学工程
膜
复合材料
化学
法拉第效率
电极
工程类
冶金
物理
物理化学
热力学
生物化学
作者
Xuhong Niu,Jing Li,Jianfeng Song,Yueming Li,Tao He
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2021-10-12
卷期号:4 (10): 11080-11089
被引量:13
标识
DOI:10.1021/acsaem.1c01949
摘要
Due to the abundance and low costs of sodium resources, sodium ion batteries have attracted increasing attention for large-scale energy applications. The separator is one of the key materials that determines the performance of sodium ion batteries. Here a separator for sodium ion batteries is prepared using a thermally stable poly(ether imide) (PEI) and polyvinylpyrrolidone (PVP) blend via immersion phase separation. The PEI/PVP separators show an interconnected porous structure due to the secondary stage demixing of PVP and PEI polymers. The PEI/PVP separator demonstrated better wettability, higher ionic conductivity (1.14 mS cm–1), and higher thermal stability (up to 180 °C) compared to commercial polypropylene, and better flexibility and mechanical strength (39%, 6.7 MPa) compared to a glass fiber (GF) separator. The disordered mesoporous carbon/Na cell with a 16/12 PEI/PVP separator shows a high discharge capacity of 119.4 mAh g–1 at 0.5 C. Moreover, the cycling stability and rate performance of the sodium ion batteries is greatly enhanced using the prepared PEI/PVP as a separator. The enhanced electrochemical performance of the sodium ion batteries is attributed to the interconnected porous structure and high electrolyte uptake. These results suggest that the PEI/PVP separator is promising for safe and high performance sodium ion batteries.
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