Interface-Controlled Redox Chemistry in Aqueous Mn⁺/MnO₂ Batteries.

Manganese dioxide (MnO) deposition/dissolution (Mn/MnO) chemistry, involving a two-electron-transfer process, holds promise for safe and eco-friendly large-scale energy storage. However, challenges like electrode/electrolyte interface environment fluctuations (H and HO activity), irreversible Mn degradation, and limited understanding of degradation mechanisms hinder the reversibility of the Mn/MnO conversion. This study demonstrates a vanadyl/pervanadyl (VO/VO ) redox-mediated interface designed for high-energy Mn/MnO batteries.

Recent Advances in Scalable, High-Mass Loaded Electrodes for Grid-Scale Energy Storage.

The increasing electrification of daily life as well as the intermittent characteristic of renewable energy sources require viable solutions for grid-scale energy storage. Critical considerations for grid storage applications are electrode mass loading and electrode thickness as these features govern battery pack energy density, an important factor in determining manufacturing costs. For this reason, there is increased interest in finding new ways of creating electrodes with high mass loading.

Interpenetrated Structures for Enhancing Ion Diffusion Kinetics in Electrochemical Energy Storage Devices.

The architectural design of electrodes offers new opportunities for next-generation electrochemical energy storage devices (EESDs) by increasing surface area, thickness, and active materials mass loading while maintaining good ion diffusion through optimized electrode tortuosity. However, conventional thick electrodes increase ion diffusion length and cause larger ion concentration gradients, limiting reaction kinetics. We demonstrate a strategy for building interpenetrated structures that shortens ion diffusion length and reduces ion concentration inhomogeneity.