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The Zn anode-based electrochromic energy storage devices (EESDs) provide a promising strategy to overcome the contradiction of electrochromism and energy storage for efficient devices. In this regard, the device configuration can endow the electrochromic devices with superior electrochromic performance and excellent energy recovery efficiencies. [Display omitted] With the emerging demand of multifunctional optoelectronic devices, the integration of electrochromism and energy storage functionalities within a single platform has become a research frontier in the electrochromic community. However, the conventional electrochromic function is inherently contradictory to the energy storage function in electrochromic devices. In this review, we firstly introduced the working principles and device configurations of the rudimentary electrochromic energy storage devices (EESDs), where the origin of the contradiction between electrochromic and energy storage functionalities is comprehensively introduced. We then reviewed the current status and applications of EESDs, where we hope to clearly reveal the developing trends of the EESDs. Finally, we proposed our perspectives on the design strategy of zinc anode-based electrochromic devices for overcoming the contradiction between electrochromism and energy storage of EESDs. [ABSTRACT FROM AUTHOR]

Electrochromic displays have attracted increased attention owing to their reversible switch of multicolors. However, the external voltage requirement for triggering the color switching makes them far from an optimum energy‐efficient technology. The newly developed electrochromic batteries eliminate the energy consumption for coloration while they can retrieve the consumed energy for bleaching. Such features make the electrochromic battery technology the most promising technology for energy‐efficient electrochromic displays. Here, a scalable method to synthesize colloidal V3O7 nanoparticles is presented, which is compatible with solution‐process techniques for aqueous Zn‐V3O7 electrochromic battery displays. The Zn‐V3O7 electrochromic battery display shows an optical transmittance contrast (21%), rapid self‐coloration time (6.6 s), and switching times (10.4/28.6 s for coloration/bleaching processes). Moreover, the electrochromic battery display shows a compelling energy retrieval function. For a proof of concept, a prototype display is constructed, which possesses an open‐circuit potential (OCP) of 1.38 V. The prototype display can reversibly switch between the multicolors (fully yellow, fully grayish‐blue, and half yellow‐half grayish‐blue images) and partially retrieve the consumed energy. This research presents a facile strategy to synthesize colloidal V3O7 nanoparticles, as well as a novel electrochromic battery display having energy retrieval functions, thus facilitating the development of energy‐efficient electrochromic displays. [ABSTRACT FROM AUTHOR]