Abstract : The Cover Feature illustrates the construction of a polydopamine/PEO composite electrolyte by a mussel‐adhesive inspired strategy. The mechanical, thermal and flame retarding properties of PEO electrolyte are comprehensively improved, and the all‐solid‐state lithium ion battery made from this composite electrolyte demonstrates good rate performance and cycling stability. More information can be found in the Article by H. Huang et al.