Query: Zinc ion battery

title: Electrochemically induced cationic defect in MnO intercalation cathode for aqueous zinc ion battery
abstract: The Mn dissolution is a key issue in the application of high energy density manganese based materials, but the use of Mn dissolution to unlock the electrochemical activity of electrode materials is rarely achieved. Here, an in situ electrochemical approach has been developed for the activation of MnO by inducing Mn defect, wherein the Mn defects are formed through a charge process that converts the MnO with poor electrochemical activities towards Zn2+ into high electrochemically active cathode for aqueous zinc ion batteries (ZIBs) More importantly, this cathode exhibits an insertion/extraction mechanism without structural collapse during storage/release of Zn2+ The as designed Zn/MnO battery delivers a high energy density of 383.88 Wh kg 1 at a power density of 135.6 W kg 1. The results demonstrate that the Mn defect MnO would be a promising cathode for aqueous ZIBs, which is expected to be used in commercial large scale energy storage. This work may pave the way for the possibility of using defect chemistry to introduce novel properties in electrode materials for high performance aqueous ZIBs.

title: A Deep Cycle Aqueous Zinc Ion Battery Containing an Oxygen Deficient Vanadium Oxide Cathode
abstract: Rechargeable aqueous zinc ion batteries are attractive because of their inherent safety, low cost, and high energy density. However, viable cathode materials (such as vanadium oxides) suffer from strong Coulombic ion lattice interactions with divalent Zn2+ thereby limiting stability when cycled at a high charge/discharge depth with high capacity. A synthetic strategy is reported for an oxygen deficient vanadium oxide cathode in which facilitated Zn2+ reaction kinetic enhance capacity and Zn2+ pathways for high reversibility. The benefits for the robust cathode are evident in its performance metrics; the aqueous Zn battery shows an unprecedented stability over 200 cycles with a high specific capacity of approximately 400 mAh g 1 achieving 95 utilization of its theoretical capacity, and a long cycle life up to 2 000 cycles at a high cathode utilization efficiency of 67 This work opens up a new avenue for synthesis of novel cathode materials with an oxygen deficient structure for use in advanced batteries.

title: Organic Inorganic Induced Polymer Intercalation into Layered Composites for Aqueous Zinc Ion Battery
abstract: Rechargeable aqueous zinc based batteries are very attractive alternative devices for current energy storage by virtue of their low cost and high security. However, the performance of vanadium oxide cathode strongly relies on the distance of interlayer spacing. Here, we employ layered PEDOT NH4V3O8 (PEDOT NVO) as a cathode material, which produces an enlarged interlayer spacing of 10.8 A (against 7.8 A for the single NVO) by effectively conducting polymer intercalation. This cathode material exhibits an improved capacity of 356.8 mAh g 1 at 0.05 A g 1 and 163.6 mAh g 1, even at the highest current density of 10 A g 1 (with a high retention from 0.05 to 10 A g 1) and features an ultra long lifetime of over 5,000 charge discharge cycles with a capacity retention of 94.1% A combination of mechanism analyses and theoretical calculations suggest that the oxygen vacancies and larger interlayer spacing through polymer assistance account for the improved electrochemical performance.

title: A chemically self charging aqueous zinc ion battery
abstract: Self charging power systems integrating energy harvesting technologies and batteries are attracting extensive attention in energy technologies. However, the conventional integrated systems are highly dependent on the availability of the energy sources and generally possess complicated configuration. Herein, we develop chemically self charging aqueous zinc ion batteries with a simplified two electrode configuration based on CaV 6 O 16 *3H 2 O electrode. Such system possesses the capability of energy harvesting, conversion and storage simultaneously. It can be chemically self recharged by the spontaneous redox reaction between the discharged cathode and oxygen from the ambient environment. Chemically self recharged zinc ion batteries display an initial open circuit voltage of about 1.05 V and a considerable discharge capacity of about 239 mAh g 1 indicating the excellent self rechargeability. Impressively, such chemically self charging zinc ion batteries can also work well at chemical or/and galvanostatic charging hybrid modes. This work not only provides a route to design chemically self charging energy storage, but also broadens the horizons of aqueous zinc ion batteries. Self charging power systems integrating energy generation and storage are receiving consideration attention. Here the authors report an aqueous Zn ion battery that can be self recharged by the spontaneous redox reaction between cathode and oxygen from ambient environment without external power supply.

title: Mechanochemical reactions of MnO2 and graphite nanosheets as a durable zinc ion battery cathode
abstract: Manganese dioxide has been recognized as the ideal cathode for the aqueous zinc ion batteries (ZIBs) Nevertheless, the poor conductivity and infinite relative volume changes limit its further practical applications. Herein, we developed a promising cathode design by ball milling of electrolytic manganese dioxide (MnO2) in the presence of graphite nanosheets. MnO2/graphite hybrids with the increase of contact surface and interfacial interaction are beneficial to construct an interfacial 3D conductive network and improve the inherent stability, which achieve the minimum volume change. As expected, the rate and cycling performance of MnO2/graphite hybrids (230 mAh g 1 at 0.1 A g 1, 80 mAh g 1 at 1 A g 1, 80.8% after 1000 cycles at 1 A g 1) are better than that of MnO2 (113 mAh g 1 at 0.1 A g 1, 24 mAh g 1 at 1 A g 1, 51.2% after 1000 cycles at 1.0 A g 1) The reduced volume change during charging/discharging can be observed via in situ optical observations. Furthermore, the Zn ion battery delivers higher energy density of 247 Wh kg 1 at 0.27 kW kg 1 and higher power density of 11.78 kW kg 1 at 78 Wh kg 1. Our work demonstrates the successful and large scale conversion of industrial electrolytic manganese dioxide into a high performance cathode of ZIBs.

title: A High Capacity Ammonium Vanadate Cathode for Zinc Ion Battery
abstract: 3D flower like architecture assembled by NH 4 V 4 O 10 nanobelts (3D NVO) was fabricated. The Zn 2+ ion was intercalated into NVO cathode within the interlayer region (NH 4 V 4 O 10 Zn x NH 4 V 4 O 10 The 3D NVO cathode could deliver a large reversible capacity of 485 mAh g 1 at a current density of 100 mA g 1 for zinc ion battery. Given the advantages of being abundant in resources, environmental benign and highly safe, rechargeable zinc ion batteries (ZIBs) enter the global spotlight for their potential utilization in large scale energy storage. Despite their preliminary success, zinc ion storage that is able to deliver capacity 400 mAh g 1 remains a great challenge. Here, we demonstrate the viability of NH 4 V 4 O 10 (NVO) as high capacity cathode that breaks through the bottleneck of ZIBs in limited capacity. The first principles calculations reveal that layered NVO is a good host to provide fast Zn 2+ ions diffusion channel along its [010] direction in the interlayer space. On the other hand, to further enhance Zn 2+ ion intercalation kinetics and long term cycling stability, a three dimensional (3D) flower like architecture that is self assembled by NVO nanobelts (3D NVO) is rationally designed and fabricated through a microwave assisted hydrothermal method. As a result, such 3D NVO cathode possesses high capacity (485 mAh g 1 and superior long term cycling performance (3000 times) at 10 A g 1 50 s to full discharge/charge) Additionally, based on the excellent 3D NVO cathode, a quasi solid state ZIB with capacity of 378 mAh g 1 is developed.

title: Constructing a MnO2@PPy core shell nanorods towards enhancing electrochemical behaviors in aqueous zinc ion battery
abstract: In this work, polypyrrole coated a MnO2 core shell nanorods (a MnO2@PPy) were constructed via an in situ self polymerization process. In aqueous zinc ion battery testing, the a MnO2@PPy exhibits a capacity of 148 mAh/g and remain 85 mAh/g after 100 cycles, showing great improvement upon the bare a MnO2 sample. The enhanced performances should be ascribed to the polypyrrole coating, which not only alleviates the Mn2+ dissolution but also improves the conductivity of a MnO2 electrode.

title: Fundamentals and perspectives in developing zinc ion battery electrolytes: a comprehensive review
abstract: The development of low cost and high safety zinc ion batteries (ZIBs) has been extensively discussed and reviewed in recent years, but the work on the comprehensive discussion and perspectives in developing zinc ion electrolytes is still relatively lacking. Faced with critical challenges and bottlenecks practically, the viability of ZIBs critically depends on the development of suitable electrolytes and their practical considerations. In this review, a systematic summary with regard to the basic characteristics of zinc ion electrolytes facing different issues from optimization strategies to the fundamental science of electrolyte/electrode interfaces (EEIs) particularly in the feasible modifications and advanced characterizations of EEIs, has been put forward. Due to the lack of consideration of the practical issues in major academic studies, we have particularly highlighted aspects that mainly focus on the choice of the electrolyte system, dosage of liquid and fluid electrolytes, status of gel and all solid electrolytes, together with other concerns related to the electrolytes. The final section proposes significant perspectives to guide and promote the development of zinc ion electrolytes.

title: Layered Ca0.28 MnO2 *0.5H2 O as a High Performance Cathode for Aqueous Zinc Ion Battery.
abstract: Aqueous zinc ion batteries are promising candidates for grid scale energy storage because of their intrinsic safety, low cost, and high energy intensity. However, lack of suitable cathode materials with both excellent rate performance and cycling stability hinders further practical application of aqueous zinc ion batteries. Here, a nanoflake self assembled nanorod structure of Ca0.28 MnO2 *0.5H2 O as Zn insertion cathode material is designed. The Ca0.28 MnO2 *0.5H2 O exhibits a reversible capacity of 298 mAh g 1 at 175 mA g 1 and long term cycling stability over 5000 cycles with no obvious capacity fading, which indicates that the per insertion of Ca ions and water can significantly improve reversible insertion/extraction stability of Zn2+ in Mn based layered type material. Further, its charge storage mechanism, especially hydrogen ions, is elucidated. A comprehensive study suggests that the intercalation of hydrogen ions in the first discharge plat is controled by both pH value and type of anion of electrolyte. Further, it can stabilize the Ca0.28 MnO2 *0.5H2 O cathode and facilitate the following insertion of Zn2+ in 1 m ZnSO4 /0.1 m MnSO4 electrolyte. This work can enlighten and promote the development of high performance rechargeable aqueous zinc ion batteries.

title: Porous V2O5 yolk shell microspheres for zinc ion battery cathodes: activation responsible for enhanced capacity and rate performance
abstract: Rechargeable aqueous zinc ion batteries have attracted significant attention for practical energy storage due to their low cost and high safety, however, it is still a hard task to find suitable cathode materials to meet the demand of both high capacity and rate performance. Here, we propose a high performance anhydrous V2O5 yolk shell cathode via a facile template free solvothermal technique. Owing to its porous structure, the V2O5 cathode could largely facilitate rapid electrolyte transportation and restrain structural collapse during cycling. Moreover, it is interesting to find that the interlayer spacing expands from 4.37 to 13.45 A through an interesting activation process, as a result, the prepared V2O5 cathode demonstrated high reversible capacities of 410 mA h g 1 at 0.1 A g 1 and 182 mA h g 1 at 20 A g 1 and a capacity retention of 80% can be achieved over 1000 cycles at 5.0 A g 1, which is superior to those of most commonly reported anhydrous V2O5 cathodes. Therefore, this paper demonstrates the potential of V2O5 for achieving high energy/power densities as a cathode material in ZIBs.