Recently lithium ion batteries (LIBs) are widely used as portable powers for electronic products, for example, laptop computers, digital cameras and cellphones etc., due to their high energy density, long cycle life and environmental-friendliness [1] and [2]. However, their performances are urgently required to be enhanced for broader applications. Separators are one of the critical components in LIBs, especially in liquid lithium ion batteries (LLIBs), which could prevent physical contact between the electrodes and enable lithium ionic transportation while isolate electronic flow. Among a number of materials developed so far, polypropylene (PP) is one of the most dominant materials used for separators in LLIBs for its low price, chemical resistance and thermal stability, etc [3] and [4]. However, the major drawbacks of this kind separator lie in its intrinsically low polarity and low surface energy, which would result in poor compatibility between separators with liquid electrolyte and electrodes in the batteries [5]. To this point, modification of PP separators is of great importance for the preparation of high performance LIBs.