Nanomat Li–S batteries based on all-fibrous cathode/separator assemblies and reinforced Li metal anodes are presented to enable ultrahigh-energy-density and flexibility.

) of long-range (=300 miles) electric vehicle batteries. In addition, the heteronet-enabled mechanical compliance of CM electrodes, in combination with readily deformable CNF separators, allows the fabrication of paper crane batteries via origami folding technique.

Spiderweb‐mimicking anion‐exchangeable separators are presented as a membrane‐driven strategy for the development of high‐performance Li‐S batteries by Sang‐Young Lee and co‐workers in article number https://doi.org/10.1002/adfm.201801422. The polyionic liquid (PVIm[TFSI])‐based nanomat in the spider separator enables discharge voltage‐dependent, reversible trap/release of polysulfides via an anion exchange reaction between TFSI− anions and polysulfides. The seperator's unique nanomat structure and chemical functionalities exceptionally improve the electrochemical performance of Li‐S batteries.

In article number 1908868, Hyun‐Wook Lee, Ki‐Suk Lee, Sang‐Young Lee, and co‐workers present an electrical conductivity gradient interfacial host comprising 1D high conductivity copper nanowires and nanocellulose insulating layers for stable lithium metal anodes. The conductivity gradient system guides the nucleation sites of Li‐metal to be directed during electrochemical plating.

The recent progress of cellulose for use in energy storage devices as an appealing natural material that can outperform traditional synthetic materials is described by Sang-Young Lee, Leif Nyholm, and co-workers in article number 2000892. Driven by its structural/chemical uniqueness, cellulose brings exceptional benefits in the manufacturing of components and devices, along with improvements in their electrochemical performance, mechanical flexibility, cost competitiveness, and form factors.