Superior-Performance Aqueous Zinc Ion Battery Based on Structural Transformation of MnO 2 by Rare Earth Doping

287

150

The development of advanced cathode materials for aqueous the zinc ion battery (ZIB) represents a crucial step toward building future large‐scale green energy conversion and storage systems. Recently, significant progress has been achieved in the development of manganese‐based oxides for ZIB via defect engineering, whereby the intrinsic capacity and energy density have been enhanced. In this review, an overview of the recent progress in the defect engineering of manganese‐based oxides for aqueous ZIBs is summarized in the following order: 1) the structures and properties of the commonly used manganese‐based oxides, 2) the classification of the various types of defect engineering commonly reported, 3) the various strategies used to create defects in materials, and 4) the effects of the various types of defect engineering on the electrochemical performance of manganese‐based oxides. Finally, a perspective on the defect engineering of manganese‐based oxides is proposed to further enhance their electrochemical performance as a ZIB cathode.

Section: Defect Engineering On Manganese‐based Oxidesmentioning

confidence: 99%

Section: Defect Engineering On Manganese‐based Oxidesmentioning

confidence: 99%

Section: Defect Engineering On Manganese‐based Oxidesmentioning

confidence: 99%

See 1 more Smart Citation

Defect Engineering in Manganese‐Based Oxides for Aqueous Rechargeable Zinc‐Ion Batteries: A Review

Xiong

Zhang

Lee

et al. 2020

287

150

“…Therefore, the generation of such built-in electric filed via Ti-doping is expected to promote the transport kinetics of ion diffusion and electron transport in the host structure, and thus improving the practical electrochemical performance of MnO 2 NWs. [207] Unlike the layered materials, spinel structured Mn-based materials are another classic representation, which also face to the poor structural stability during phase transition. Keeping this in mind, Long et al [205] (x = 1.5) show the higher conductivity with half-metal nature.…”

Section: Metal Ion Dopingmentioning

confidence: 99%

Understanding the Design Principles of Advanced Aqueous Zinc‐Ion Battery Cathodes: From Transport Kinetics to Structural Engineering, and Future Perspectives

Yong

Wang

et al. 2020

246

144

have also greatly aroused the positive exploration of alternative LIB technologies in recent years. [44] In contrast to the flammable organic electrolyte in LIBs, the aqueous one exhibits lower cost, higher safety, and especially the superior ionic conductivity, which is generally two orders of magnitude higher than that of the organic system. [9,10] All those unparalleled advantages would make the aqueous battery technologies to be the promising candidates in the future. [11] Rechargeable aqueous zinc-ion batteries (AZIBs), which is mainly composed of zinc metal anode, zinc salt-based aqueous electrolyte, and Zn 2+ host cathode, hold the great promise for energy storage applications in very recent years. [12,13] Compared with nonaqueous alkali-ion batteries, the use of cheap and high ambient stable zinc metal anode and inexpensive aqueous electrolyte with superior ionic conductivity (Figure 1a) would make such type of battery to be one of the most promising commercial candidates in the future market. [14-17] To date, extensive studies have been reported for AZIBs, and relating publications have dramatically increased especially in these two years, as shown in Figure 1b. However, the insufficient energy density seems to become the bottleneck that hinder their practical applications at current status. [4,5,18] Such issue could be ascribed to the narrow operating voltage of aqueous electrolyte, insufficient electrochemical performance of cathode materials, and Zn anode. [13,19,20] Besides, the influence of other components such as separator and collector also should be considered to some extent. [20,21] Among them, the studies of widening operating voltage of electrolyte and the optimization of other components only received less attention, which still remain at the early stage. [22,23] On the contrary, more attentions were paid to the electrochemical performance tuning of electrode materials. [24-26] Besides, considering the fixed operating voltage of Zn metal anode, the modification of cathode materials seems to provide more possibilities to effectively improve the energy density of AZIBs, owing to their rich material systems. [20,26,27] Under these considerations, the rational design of advanced cathodes is expected to be a preferential task to develop. Up to now, many types of materials have been exploited as cathode candidates and applied for AZIBs, however, those Rechargeable aqueous zinc-ion batteries (AZIBs) have attracted extensive attention and are considered to be promising energy storage devices, owing to their low cost, eco-friendliness, and high security. However, insufficient energy density has become the bottleneck for practical applications, which is greatly influenced by their cathodes and makes the exploration of high-performance cathodes still a great challenge. This review underscores the recent advances in the rational design of advanced cathodes for AZIBs. The review starts with a brief summary and evaluation of cathode material systems, as well as the introduction of proposed storage mechani...

“…[ 2 ] In addition, redox flow batteries have the characteristics of high safety, high efficiency, and long life, showing promises for large‐scale energy storage. [ 154–157 ] The feasibility of redox flow MnO 2 ‐Zn battery ( Figure 5 a) was first demonstrated by Qiao and coworkers. [ 79 ] A redox‐flow battery stack with a capacity of 2 Ah was built, which demonstrated a practical strategy toward large‐scale energy storage using the new electrolytic MnO 2 ‐Zn system.…”

Section: Aqueous Mn‐based Batteries With Mn2+/mno2 Chemistrymentioning

confidence: 99%

Opportunities of Aqueous Manganese‐Based Batteries with Deposition and Stripping Chemistry

Wang

Zheng

Zhang

et al. 2020

135

108

Rechargeable aqueous manganese‐based batteries have been attracting significant attention owing to their advantages of low cost, high safety, and ease of manufacturing, which are promising attributes for grid‐scale energy storage applications. However, most traditional manganese‐based batteries with solid‐state conversion and intercalation reactions suffer from low capacity and poor long‐term cycling stability. The recent novel storage mechanism based on cathode Mn2+/MnO2 deposition/stripping chemistry has fundamentally tackled these issues, enabling a new generation of manganese‐based batteries with superior electrochemical performance. Here, the recent advances in aqueous manganese‐based batteries with the Mn2+/MnO2 deposition/stripping chemistry are reviewed. A summary of the development of manganese‐based batteries with different storage mechanisms is provided and new opportunities for the emerging Mn2+/MnO2 chemistry in the latest generation are highlighted. Then, the current understanding of the Mn2+/MnO2 charge storage mechanism and its potential in manganese‐based batteries for large‐scale energy storage applications is presented. Moreover, insights into opportunities and future directions for manganese‐based batteries with the Mn2+/MnO2 chemistry are proposed.