A redox electrolyte is a crucial part of dye-sensitized solar cells (DSSCs), which plays a significant role in the photovoltage and photocurrent of the DSSCs through efficient dye regeneration and minimization of charge recombination. An I^-/I₃ ^- redox shuttle has been mostly utilized, but it limits the open-circuit voltage (V _oc) to 0.7-0.8 V. To improve the V _oc value, an alternative redox shuttle with more positive redox potential is required. Thus, by utilizing cobalt complexes with polypyridyl ligands, a significant power conversion efficiency (PCE) of above 14% with a high V _oc of up to 1 V under 1-sun illumination was achieved. Recently, the V _oc of a DSSC has exceeded 1 V with a PCE of around 15% by using Cu-complex-based redox shuttles. The PCE of over 34% in DSSCs under ambient light by using these Cu-complex-based redox shuttles also proves the potential for the commercialization of DSSCs in indoor applications. However, most of the developed highly efficient porphyrin and organic dyes cannot be used for the Cu-complex-based redox shuttles due to their higher positive redox potentials. Therefore, the replacement of suitable ligands in Cu complexes or an alternative redox shuttle with a redox potential of 0.45-0.65 V has been required to utilize the highly efficient porphyrin and organic dyes. As a consequence, for the first time, the proposed strategy for a PCE enhancement of over 16% in DSSCs with a suitable redox shuttle is made by finding a superior counter electrode to enhance the fill factor and a suitable near-infrared (NIR)-absorbing dye for cosensitization with the existing dyes to further broaden the light absorption and enhance the short-circuit current density (J _sc) value. This review comprehensively analyzes the redox shuttles and redox-shuttle-based liquid electrolytes for DSSCs and gives recent progress and perspectives.

Despite the increasing demand for high‐energy‐density lithium batteries, the development of high‐mass‐loading electrodes remains challenged by structural instability and poor charge transfer. Herein, an ionically conductive elastic polymer (ICEP) binder, designed to enable the fabrication of ultrahigh mass‐loading Ni‐rich layered cathodes (LiNi _0.8 Co _0.1 Mn _0.1 O ₂ , NCM811), is introduced. The ICEP binder integrates mechanical elasticity, strong adhesion, and ionic conductivity through diverse functional groups, addressing challenges in high‐mass‐loading electrode fabrication. Hydrogen bonding between the ICEP binder and NCM811 particles ensures uniform electrode morphology, forming a stable cathode–electrolyte interphase (CEI). This stable interface mitigates surface side reactions, suppresses phase transitions in NCM811, and improves long‐term electrochemical stability. Additionally, the ICEP binder enhances Li‐ion diffusivity, reduces interphase resistance, and promotes faster electrochemical kinetics, while preventing solvent‐drying‐induced cracking. As a result, high‐mass‐loading electrodes (62.4 mg cm⁻ ² , 12.5 mAh cm⁻ ² ) are successfully fabricated with the ICEP binder and demonstrate 94.6% capacity retention. Furthermore, a double‐stacked pouch‐type lithium metal full cell incorporating ICEP‐based cathodes achieves energy densities of 377.6 Wh kg _cell ⁻ ¹ and 1016.8 Wh L _cell ⁻ ¹ (including package materials), setting new benchmarks for lithium metal batteries. These findings establish ICEP as a highly effective binder for next‐generation high‐energy‐density batteries, offering a scalable and commercially viable solution for ultrahigh‐loading cathodes.