Interfacial chemical binding and improved kinetics assisting stable aqueous Zn–MnO2 batteries

Huang, Jiangnan; Tang, Xincun; Liu, K.; Fang, Guozhao; He, Zhidong; Li, Z.

doi:10.1016/j.mtener.2020.100475

Cited by 61 publications

(66 citation statements)

References 71 publications

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“…Thee lectrochemical performance of a-MnO 2 cathodes (electrode preparation is given in the Supporting Information) are investigated in coin cells using Zn plate as anode in 3M ZnSO 4 + 0.2 MM nSO 4 aqueous electrolyte.A dding MnSO 4 in electrolyte is crucial for suppressing Mn 2+ dissolution [16] and promoting the capacity delivery of MnO 2 electrodes (Figure S7). We note that the capacity contribution from MnO 2 /Mn 2+ redox is negligible (< 0.2 %) during cycling (Figure S8).…”

Section: Resultsmentioning

confidence: 99%

Boosting the Energy Density of Aqueous Batteries via Facile Grotthuss Proton Transport

et al. 2020

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The recent developments in rechargeable aqueous batteries have witnessed a burgeoning interest in the mechanism of proton transport in the cathode materials. Herein, for the first time, we report the Grotthuss proton transport mechanism in α‐MnO2 which features wide [2×2] tunnels. Exemplified by the substitution doping of Ni (≈5 at.%) in α‐MnO2 that increases the energy density of the electrode by ≈25 %, we reveal a close link between the tetragonal‐orthorhombic (TO) distortion of the lattice and the diffusion kinetics of protons in the tunnels. Experimental and theoretical results verify that Ni dopants can exacerbate the TO distortion during discharge, thereby facilitating the hydrogen bond formation in bulk α‐MnO2. The isolated direct hopping mode of proton transport is switched to a facile concerted mode, which involves the formation and concomitant cleavage of O−H bonds in a proton array, namely via Grotthuss proton transport mechanism. Our study provides important insight towards the understanding of proton transport in MnO2 and can serve as a model for the compositional design of cathode materials for rechargeable aqueous batteries.

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Section: Resultsmentioning

confidence: 99%

Boosting the Energy Density of Aqueous Batteries via Facile Grotthuss Proton Transport

et al. 2020

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“…The porosity of the CNT foam and amorphous morphology of MnO 2 enabled a fast diffusion for ions and work without the addition of binders and current collectors. To mitigate the dissolution of Mn, Huang et al [ 99 ] coated the surface of α‐MnO 2 nanorods with polypyrrole. Findings from this study have shown that the cathode material achieved higher cycling stability with no occurrence of capacity fading even at high current density as opposed to pristine α‐MnO 2 nanorods.…”

Section: Introductionmentioning

confidence: 99%

“…One of the major hindrances of MnO 2 ‐based cathodes is the dissolution of Mn, which often results in poor cycling stability. Huang et al [ 99 ] investigated the effect of coating MnO 2 with polypyrrole (PPy), which produces an interfacial chemical binding between Mn and N. This modification has proved to be effective, which resulted in no capacity fading at low current density of 100 mA g −1 (256 mAh g −1 after 50 cycles) and high current density of 1000 mA g −1 (104 mAh g −1 after 500 cycles), as opposed to unmodified MnO 2 nanorods. Density functional theory (DFT) calculations revealed that there is a higher energy barrier for Mn to escape from the MnN bond; therefore, the PPy coating is able to suppress Mn dissolution.…”

Section: Introductionmentioning

confidence: 99%

“…The deposition of amorphous α‐MnO 2 on CNT foam 3D framework produced a high‐performance cathode for AZIBs. [ 99 ] With excellent rate performance and stable cycling over 1000 cycles, the MnO 2 @CNT foams worked via the reversible coinsertion of H + and Zn 2+ . The porosity of the CNT foam and amorphous morphology of MnO 2 enabled a fast diffusion for ions and work without the addition of binders and current collectors.…”

Section: Introductionmentioning

confidence: 99%

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Recent Progress in Layered Manganese and Vanadium Oxide Cathodes for Zn‐Ion Batteries

Bensalah

Luna

2021

Energy Tech

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Aqueous zinc‐ion batteries (AZIBs) are promising candidates for grid‐scale energy‐storage systems, which are essential for maintaining and distributing energy generated from various sources. In contrast to current commercial lithium‐ion batteries (LIBs), AZIBs offer advantages such as, but not limited to, high safety, low cost, and fast kinetics. Zn intercalation material serves as the key element for the suitability of Zn‐ion batteries (ZIBs) for grid and stationary applications. Different materials are tested as cathode materials for ZIBs, including manganese oxides and vanadium oxides. MnO2‐ and V2O5‐based cathodes, in particular, seem compatible with ZIBs, with the potential to perform better than existing batteries in the market. Due to the fast and facile (de)intercalation‐type storage mechanism of Zn2+ ions, layered electrode materials generally have a more stable structure during battery charge and discharge cycles. Materials with large interlayer spacing are expected to exhibit good electrochemical performance, thereby favoring hydrated and cation‐intercalated materials in the development of AZIBs cathodes. Herein, an overview is provided on the synthesis, morphology, and electrochemical performance of various MnO2‐ and V2O5‐based cathode materials in AZIB, as well as the challenges that must be overcome to reach the commercialization of AZIBs.

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“…To increase the cycle life of the Zn anode, researchers have recently developed certain optimization strategies such as tuning electrolytes with additives [13], applying "water in salt" electrolytes [14], organic/inorganic coating [15,16], and utilizing 3D current collectors [17,18]. Furthermore, the electrochemical performance of cathode materials has been improved using optimization methods such as metal substitution [19], coating with conductive layers [20,21], applying pre-intercalation strategy [22,23], and defect engineering [24,25]. Pre-intercalation engineering provides a basic and effective insight for optimizing the structure and correlated electrode performance of Mn-and Vbased host materials.…”

Section: Introductionmentioning

confidence: 99%

Superior cycling stability of H0.642V2O5·0.143H2O in rechargeable aqueous zinc batteries

et al. 2021

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To increase the service life of rechargeable batteries, transition metal oxide hosts with high structural stability for the intercalation of carrier ions are important. Herein, we reconstruct the crystal structure of a commercial V 2 O 5 by pre-intercalating H + and H 2 O pillars using a facile hydrothermal reaction and obtain a bi-layer structured H 0.642 V 2 O 5 •0.143H 2 O (HVO) as an excellent host for aqueous Zn-ion batteries. Benefiting from the structural reconstruction, the irreversible "layer-to-amorphous" phase evolution during cycling is considerably less, resulting in ultra-high cycling stability of HVO with nearly no capacity fading even after 500 cycles at a current density of 0.5 A g −1 . Moreover, a synthetic proton and Zn 2+ intercalation mechanism in the HVO host is demonstrated. This work provides both a facile synthesis method for the preparation of V-based compounds and a new viewpoint for achieving high-performance host materials.

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Interfacial chemical binding and improved kinetics assisting stable aqueous Zn–MnO2 batteries

Cited by 61 publications

References 71 publications

Boosting the Energy Density of Aqueous Batteries via Facile Grotthuss Proton Transport

Boosting the Energy Density of Aqueous Batteries via Facile Grotthuss Proton Transport

Recent Progress in Layered Manganese and Vanadium Oxide Cathodes for Zn‐Ion Batteries

Superior cycling stability of H0.642V2O5·0.143H2O in rechargeable aqueous zinc batteries

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