Contents: (Small 42/2017)

In article number 1701471, Keyu Xie, Bingqing Wei, and co-workers synthesize molybdenum disulfide (MoS 2 ) "roses" grown on reduced graphene oxide sheets (rGO) with a unique nano-architecture. It displays one of the best electrochemical performances to date as an anode material for nonaqueous K-ion batteries (KIBs), and a combined K + storage mechanism of intercalation and conversion reaction is revealed. Important insights and understanding of advanced KIBs are provided, opening new opportunities for developing less-expensive and more efficient next-generation electrochemical energy storage devices.