Polymer composites and blends for battery separators: State of the art, challenges and future trends

• Membrane separators play a key role with respect to lithium ion battery performance.
• The developments on polymer composites and blends for membrane separators are presented.
• The effects of the different fillers are discussed by filler type.
• The effects of the different blends are discussed.

In lithium ion battery systems, the separator plays a key role with respect to device performance. Polymer composites and polymer blends have been frequently used as battery separators due to their suitable properties. This review presents the main issues, developments and characteristics of these polymer composites and blends for battery separator membrane applications.This review is divided into two sections regarding the composition of the materials: polymer composite materials, subdivided according to filler type, and polymer blend materials. For each category the electrolyte solutions, ionic conductivity and other relevant physical-chemical characteristics are described.This review shows the recent advances and opportunities in this area and identifies future trends and challenges.

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