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Supercapacitor (SC) is one of the most promising electrochemical energy‐storage devices. However, the practical application of SCs is limited by the low‐energy density. Herein, high‐temperature shock (HTS)‐derived ultrafine structure‐activated porous carbon (UAPC) with N, O functional groups is reported as high‐energy density SCs carbon. The process of ultrafast joule heating and cooling effectively transfers general‐purposed carbon into electrochemical‐activated carbon. The UAPC‐based SCs exhibit an energy density of up to 129 Wh kg−1 in EMIMBF4 ionic liquid, which outperform almost all reported and commercial SCs (22 Wh kg−1). The outstanding electrochemical performance of UAPC is attributed to the ultrafine structure and N, O functional groups, which enlarges the surface area, improves the surface wettability of UAPC electrodes, and provides pseudocapacitance. The facile and efficient ultrafast‐processing strategy has opened up an unprecedented pathway for the application of low‐value carbon for the electrode design and application of SCs. [ABSTRACT FROM AUTHOR]

Flexible Zn‐based batteries are emerging candidates for wearable electronics owing to the natural merits of zinc, such as environmental friendliness and low cost. In article number 1802605 by Cheng Zhong, Jun Lu, and co‐workers, the challenges of developing flexible Li‐ion batteries are presented. Thereafter, a brief overview of recent progress in the development of flexible Zn‐based rechargeable batteries from the perspective of energy density, rechargeability, flexible electrolytes, and some other issues that remain to be addressed, are highlighted. [ABSTRACT FROM AUTHOR]