Porous membrane separators, such as polyethylene (PE), polypropylene (PP) and polypropylene-polyethylene-polypropylene (PP/PE/PP) made of polyolefin, are widely used in the lithium-ion batteries for EVs 11, 12, 13.
The latest developments on functional separators for long-life and safe Li metal batteries have been summarized and discussed in this minireview, including mechanically strengthened separator fabrication, functional separator construction towards regulated Li ion deposition, and flame-retardant separator design.
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