Although promising, the practical use of zinc‐ion batteries (ZIBs) remains plagued with uncontrollable dendrite growth, parasitic side reactions, and the high intercalation energy of divalent Zn2+ ions. Hence, much work has been conducted to alleviate these issues to maximize the energy density and cyclic life of the cell. In this holistic review, the mechanisms and rationale for the stated challenges shall be summarized, followed by the corresponding strategies employed to mitigate them. Thereafter, a perspective on present research and the outlook of ZIBs would be put forth in hopes to enhance their electrochemical properties in a multipronged approach.
Flexible zinc-ion batteries (ZIBs) have been developed by leaps and bounds in recent years. As an important cathode material, the stability of manganese dioxide is crucial to the service life and mechanical endurance of the batteries. Herein, we report the feasibility of using a molybdenum-doped α-MnO 2 (MMO) grown on carbon cloth (CC) as a flexible cathode. For CC@MMO electrodes, first, the pillaring effect of the Mo atoms can stabilize the tunnel structure and reduce the energy barrier of Zn 2 + migration. The battery has 80 % capacity retention after 1392 cycles at 0.5 A g À 1 , which is leading the current study. Then, the electrodes exhibit a unique array structure on the microscopic level, in which independently grown nanowires help buffer external stresses and improve the flexibility and stability of the electrodes. The discharge capacity of the assembled flexible battery is maintained at an average of more than 98.3 % of the initial capacity at 2.5 mA cm À 2 under different bending angles. And the microstructure of the electrodes is well maintained after 50 times of repeated bending. This work thus presents a flexible cathode with remarkable stability and survivability, which seeks to supplement the present development of advanced energy storage devices.[a] Y.
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