Pillaring Effect of K Ion Anchoring for Stable V 2 O 5 ‐Based Zinc‐Ion Battery Cathodes

Cao

et al. 2021

Adv Funct Materials

228

130

Manganese-based materials are considered potential cathode materials for aqueous zinc ion batteries (ZIBs). However, the dissolution of manganese leading to an abrupt decline of capacity and the sluggish electrochemical reaction kinetics are still the main bottlenecks restricting their further development. Herein, a NiMn-layered double hydroxide-derived Ni-doped Mn 2 O 3 (NM) is developed to suppress the dissolution of manganese. The incorporation of Ni 2+ can promote electronic rearrangement and enhance the conductivity, ultimately improving the reaction kinetics and electrochemical performance of the NM. Moreover, the doped Ni 2+ can effectively stabilize the MnO bond of Mn 2 O 3 by reducing the formation energy. In addition, the storage mechanism based on the simultaneous insertion and transformation of H + and Zn 2+ is demonstrated. Interestingly, the Ni-doped Mn 2 O 3 shows a high specific capacity of 252 mAh g-1 (0.1 A g-1), three times more than the pure Mn 2 O 3 (72 mAh g-1). The capacity retention (≈85.6% over 2500 cycles at 1.0 A g-1) is also more excellent when comparing with the Mn 2 O 3 cathode (≈49.7%). Significantly, an ultra-high energy density of 327.6 Wh kg-1 has been achieved using Ni-doped Mn 2 O 3 cathode, which suggests that the synergistic effect of manganese and other transition metal ions provide a promising strategy for future development of ZIBs.

Section: Resultsmentioning

confidence: 99%

Section: (5 Of 9)mentioning

confidence: 99%

Inhibition of Manganese Dissolution in Mn₂O₃ Cathode with Controllable Ni²⁺ Incorporation for High‐Performance Zinc Ion Battery

Cao

et al. 2021

Adv Funct Materials

228

130

Advanced Energy Materials

“…[75] According to the difference of valent state, the ions intercalation can be normally divided into the monovalent and multivalent metal ions intercalation, while the practical intercalating effect of them seems to be more depending on their ionic radius. [19,95,153,[165][166][167][168][169][170] For multivalent metal ions, many types of ion have been successfully applied, such as Fe 2+ , Co 2+ , Ni 2+ , Mn 2+ , Zn 2+ , Mg 2+ , etc., while monovalent metal ions include the Li + , Na + , K + , and so on. [171][172][173] Take the most commonly used layered V 2 O 5 for example, although this material exhibits the ultrahigh theoretical Zn 2+ storage capacity, however, those inherent shortcomings of structural instability, low electrical conductivity, as well as the sluggish ions transport kinetics have greatly impeded its application in AZIBs.…”

Section: Ions Intercalationmentioning

confidence: 99%

Section: Structural Engineering For Cathode Materialsmentioning

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

267

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...

“…Embedding monovalent alkaline metal ions (Li, Na, K) into host to form metal vanadates (M x V n O m , M = alkaline metal ion) is a strategy to synthesize effective cathode, including Li x V 2 O 5 .H 2 O, [ 59 ] NaV 3 O 8 , [ 60 ] Na 1.1 V 3 O 7.9 , [ 61 ] Na 2 V 6 O 16 .1.63H 2 O, [ 62 ] K 2 V 8 O 21 , [ 63 ] K 0.25 V 2 O 5 , [ 64–66 ] and K 0.23 V 2 O 5 . [ 67 ] Interestingly, the introduction of guest ions into V 2 O 5 might change the oxidation state of V and lead to the change in VO coordination, resulting in the variation of host structure.…”

Section: Preintercalated Cathode For Zibsmentioning

confidence: 99%

Recent Developments of Preintercalated Cathodes for Rechargeable Aqueous Zn‐Ion Batteries

Fan

et al. 2020

Energy Tech

Rechargeable aqueous zinc‐ion batteries (ZIBs) are regarded as a promising candidate for next‐generation green energy storage systems owing to their high safety, low‐cost, and low toxicity. Metal oxides with layered or tunnel structure are commonly applied as cathodes for ZIBs, but the electrochemical performance is severely limited by the structure collapse and sluggish diffusion kinetics. Preintercalating guest species into host structure is an effective strategy to solve these problems. Herein, a comprehensive overview on the recent developments of intercalation strategy in ZIBs is presented. The category and effect of guest species used in different cathode materials are presented. The issues and future research prospects in intercalation strategy are also discussed in this review.