分离器(采油)
材料科学
离子液体
电解质
离子电导率
氟化物
电化学
化学工程
锂离子电池
溶剂
多孔性
膜
电池(电)
复合材料
无机化学
化学
有机化学
电极
功率(物理)
物理
量子力学
工程类
催化作用
生物化学
物理化学
热力学
作者
Carlos M. Costa,Henrique Miguel Ribeiro Rodrigues,Attila Gören,A. V. Machado,Maria Manuela Silva,S. Lanceros‐Méndez
标识
DOI:10.1002/slct.201701028
摘要
Battery separator membranes for lithium-ion batteries have been developed based on poly(vinylidene fluoride), PVDF, and using the “green solvent” - N,N’-dimethylpropyleneurea (DMPU). This separator presents a porous microstructure with a degree of porosity of 20 % and pore size below 1 μm, showing excellent mechanical properties. Further, its ionic conductivity, tortuosity and MacMullin number values are 0.1 mS.cm−1, 4 and 82, respectively. This PVDF separator membrane was evaluated in Li/C–LiFePO4 half-cells with electrolyte solution showing good cyclability and rate capability, with a discharge value after 50 cycles of 56 mAh.g−1 at C, corresponding to 50 % of the capacity retention. Its electrochemical performance soaked in ionic liquid presents a discharge capacity of 45 mAh.g−1 at C/5-rate and capacity retention of 60%, respectively. Thus, this separator is an appropriate candidate for environmentally friendlier and safer lithium-ion batteries.
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