Improvement of structural stability of cathode by manganese additive in electrolyte for zinc‐ion batteries

Abstract

Summary Zinc‐ion batteries (ZIBs) are considered a candidate for lithium‐ion batteries owing to their low cost, eco‐friendly nature, and high safety level. In particular, their energy density is high because of a two‐electron transfer mechanism involving Zn ions. However, ZIBs have the demerits of low‐rate capability and poor cycling life because of the dissolution of Mn in the electrolyte during charging and discharging, which prevents the high potential of ZIBs from being effectively utilized. In this study, a manganese sulfate (MnSO4) additive was introduced in the electrolyte to overcome these drawbacks. A ZIB with such an electrolyte exhibited stable capacity behavior and high cycling stability. Furthermore, the fabricated ZIBs showed a specific capacity of 289 mAh g−1 at a current density of 0.3 A g−1, improved rate‐performance of 116 mAh g−1 at a current density of 2.0 A g−1, and excellent long‐term stability of 72% for 200 cycles at a current density of 1.0 A g−1. These findings indicate that the use of the aforementioned additive is a promising for enhancing the electrochemical performance of manganese‐based cathodes in electrolyte‐optimized next‐generation ZIBs.

Recent advances in aqueous zinc–sulfur batteries: overcoming challenges for sustainable energy storage

“…Various additives can effectively address challenges in batteries, such as improving electrode surface morphology and/or reducing dendrite growth by lowering electrolyte reactivity, enhancing electrolyte stability, and/or minimizing the formation of passivation layers to reduce capacity degradation. [83][84][85][86] These challenges also exist in Zn-S batteries, hindering their largescale deployment. Recent research has shown that incorporating electrolyte additives with redox regulation capabilities is a promising strategy for improving the performance of zincsulfur batteries due to their simple preparation process and effectiveness.…”

Low-Temperature and High-Performance Vanadium-Based Aqueous Zinc-Ion Batteries

“…have not been studied in a low-temperature environment. At the same time, because the ion transport rate is seriously slowed in the low-temperature system, for the cathodic material with a loose structure (such as MnO 2 ), after the cation is dissolved, it cannot return to the original lattice structure, which has an irreversible effect on the capacity. , Therefore, it is attractive and challenging to design a low-temperature and high-performance vanadate-based AZIB system.…”

Potassium-Ion-Doped Manganese Oxides and Kaolinite Electrolyte Additives for Aqueous Zinc-Ion Batteries

“…However, the MnO 2 cathode will undergo severe structural degradation during the cycle, resulting in a decrease in the cycle performance. Several optimization strategies, such as structural design, 31 cationic doping, 32 carbon coating, and electrolyte additive, 33 have been reported to enhance the electrochemical performance of manganese oxides. Cationic doping, as a common strategy for structural modification, has been proven to be effective in improving the electrochemical performance.…”