The properties of the interface between electrode active materials and electrolyte have profound effects on the performance of Li-ion batteries (LIBs). A large amount of research has so far been devoted to modifying the surfaces of active materials in order to enhance the overall performance of the electrodes. Majority of the research has resorted to inorganic oxide coatings, presumably due to their chemical stability, and different beneficial effects have been claimed for both cathode and anode materials. There have relatively been far fewer studies on polymeric coating. The rich chemistry of polymeric blend intrinsically provides great flexibility for dealing with wide varieties of active materials and electrolytes for maximum performance. In this presentation, several examples using designed polymeric blend coatings on various LIB electrodes, including graphite and Si anodes and a NCM cathode, to substantially enhanced electrode capacity, rate performance and/or high-temperature cycle stability will be presented.