电解质
分离器(采油)
膜
碳酸乙烯酯
离子电导率
化学工程
电导率
化学
复合数
无机化学
材料科学
复合材料
电极
生物化学
热力学
物理
工程类
物理化学
作者
S ZHANG,Ke Xu,T. Richard Jow
标识
DOI:10.1016/j.jpowsour.2004.07.034
摘要
We studied an inorganic composite membrane as the separator for Li-ion batteries. Being made of mainly CaCO3 powder and a small amount of polymer binder, the composite membrane has excellent wettability with liquid electrolytes due to its high porosity and good capillarity. Ionic conductivity of the membrane can be easily achieved by absorbing a liquid electrolyte. Additional benefit of such a membrane is that the alkali CaCO3 can scavenge acidic HF, which is inevitably present in the LiPF6-based electrolytes used currently in the Li-ion batteries. In this work, we typically evaluated a membrane with the composition of 92:8 (wt.) CaCO3/Telfon by using a 1.0 m LiPF6 dissolved in a 3:7 (wt.) mixture of ethylene carbonate (EC) and ethylmethyl carbonate (EMC) as the liquid electrolyte. Ionic conductivity of the electrolyte-wetted membrane was measured to be 2.4 mS cm−1 at 20 °C versus 8.0 mS cm−1 of the liquid electrolyte. With the said membrane as a separator, both Li/graphite and Li/cathode half-cells exhibited good capacity retention. We also found that the Li-ion cell fabricated in this manner not only had stable capacity retention, but also showed good high-rate performance.
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