An appropriate Zn<sup>2+</sup>/Mn<sup>2+</sup>concentration of the electrolyte enables superior performance of AZIBs

Dai, Qihang; Li, Longyan; Tu, Tiancheng; Zhang, Mingdao; Li, Song

doi:10.1039/d2ta06449a

Cited by 9 publications

(4 citation statements)

References 55 publications

(66 reference statements)

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“…Additionally, the electrolyte promotes ion diffusion rate and inhibits Mn (III) production in the electrode, thereby reducing Jahn–Teller distortion, restraining inert phases generated in the cathode, and controlling the manganese dissolution/redeposition during charge/discharge. [ 19 ] The Mn‐MOF was annealed by Sun et al in a different calcination atmosphere to prepare oxygen vacancies enriched manganese‐based oxide hybrids cathode, which delivers a high specific capacity of 336.8 mAh g −1 . [ 6 ] The conductivity of the electrode was effectively improved by the presence of oxygen vacancies, and furthermore, both the reaction kinetics and electrochemical performance have been enhanced.…”

Section: Introductionmentioning

confidence: 99%

Metal–Organic Framework‐Derived MnO/C Nanocomposite with Lamellar Porous Structure for High‐Performance Aqueous Zinc‐Ion Battery

Pan,

Hu,

Wang

et al. 2024

Energy Tech

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Manganese oxide (MnO) is a promising cathode for aqueous zinc‐ion batteries; however, issues such as low electrical conductivity, Mn2+ dissolution, and sluggish kinetics lead to poor electrochemical performance that block its commercialized application. Herein, the first utilization of Mn‐based metal–organic frameworks synthesized from manganese salt and 1,2,4,5‐benzenetetracarboxylic acid to fabricate MnO/C composite materials is presented. The analysis of electrochemical testing demonstrates that carbon‐coated MnO can effectively promote electrochemical properties compared to the pure MnO. Additionally, the Zn2+/Mn2+ concentration is optimized in order to maximize the electrode's potential in terms of electrochemical performance. The MnO/C‐600 electrode delivers a higher specific capacity of 322 mAh g−1 at 0.1 A g−1 and exhibits a capacity of 270 mAh g−1 after 360 cycles at 0.5 A g−1 in the 2.0 m ZnSO4 + 0.2 m MnSO4 system. The results also indicate that the MnO/C‐600 electrode has higher diffusion coefficients, and its unique structure improves structural stability and ion/electron transfer. Furthermore, the energy storage mechanism of the MnO/C‐600 electrode is investigated. Herein, a method is provided for preparing an inexpensive and convenient MnO/C cathode for high‐performance aqueous zinc‐ion batteries.

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Section: Introductionmentioning

confidence: 99%

Metal–Organic Framework‐Derived MnO/C Nanocomposite with Lamellar Porous Structure for High‐Performance Aqueous Zinc‐Ion Battery

Pan,

Hu,

Wang

et al. 2024

Energy Tech

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“…Electrolyte engineering is powerful in adjusting the solvation structure and inhibiting the dissolution of electrode materials. − Therefore, electrolyte adjustment strategies are considered to be one of the most effective strategies to address the challenges in AZIBs. − To address the issues facing PBAs in AZIBs, it is a creative route to take the unique feature of electrolytes to modify PBAs and form closely intergrowth structures as the cathodes. It is well-known that MnO 2 cathodes suffer from serious dissolution during cycling, leading to a sharp capacity decrease .…”

Section: Introductionmentioning

confidence: 99%

Electrochemically Active Mn²⁺ Enabling High-Performance Aqueous Zinc Ion Batteries

Wang,

Chen,

Zhang

et al. 2024

Energy Fuels

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Aqueous zinc ion batteries (AZIBs) are limited by low energy density and poor cycle life. Electrolyte engineering is one of the most effective approaches to address the challenges. In this study, MnSO 4 was selectively incorporated into the cost-effective hybrid electrolyte (ZnSO 4 +K 2 SO 4 , Zn 0.5 K 0.25 ) to improve the energy density and lifespan. Ex situ techniques of XRD and SEM confirmed the electrodeposition of Mn 2+ into porous MnO 2 nanosheets and uniformly covered the Prussian blue cathode surface, forming the nanoporous//3D open framework interface with improved kinetics. Furthermore, the porous MnO 2 nanosheets also contributed to the improved capacity, rate performance and cycling stability. The performance was noteworthy with a discharge capacity of 365.4 mAh g −1 (0.5 A g −1 ) and 156.7 mAh g −1 (3.0 A g −1 ). The capacity retention reached a remarkable 120% after 1200 cycles. Additionally, the full cell exhibited a high energy density of 299.3 Wh kg −1 . These findings provide valuable insights for improving the energy density and cycle stability of AZIBs.

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“…Nevertheless, MnO 2 faces challenges such as inherent poor conductivity, slow ion diffusion kinetics, and structural collapse due to manganese dissolution during cycling . To solve these problems, various modification strategies have attracted attention, such as heteroatom doping, − defect engineering, , construction of special morphology, and electrolyte modification . Among them, the microstructure affects the electrochemical performance of the electrode material, especially the nanorods can provide rapid migration channels for ion/electron transport, which improves the reaction kinetics of manganese-based materials .…”

Section: Introductionmentioning

confidence: 99%

“…35 To solve these problems, various modification strategies have attracted attention, such as heteroatom doping, 36−38 defect engineering, 39,40 construction of special morphology, 41 and electrolyte modification. 42 Among them, the microstructure affects the electrochemical performance of the electrode material, especially the nanorods can provide rapid migration channels for ion/electron transport, which improves the reaction kinetics of manganese-based materials. 43 Meanwhile, doping MnO 2 with metal ions is an important strategy for the modification of manganese-based materials to provide a more stable structure.…”

Section: ■ Introductionmentioning

confidence: 99%

Batch Synthesis of K-Doped α-MnO₂ Nanorods as Cathode Materials for Aqueous Zinc-Ion Battery

Yang,

Chen,

Yang

et al. 2023

Ind. Eng. Chem. Res.

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MnO 2 is widely used as the cathode material for aqueous zinc-ion batteries because of its tunnel structure, which is suitable for zinc storage. Nevertheless, MnO 2 faces issues such as inherent poor conductivity, slow ion diffusion kinetics, and structural collapse due to the manganese dissolution during cycling, resulting in significant degradation of electrochemical performance. In addition, current synthesis methods of MnO 2 often involve high costs and complex operations. Therefore, a gentle method for batch synthesis of K-doped α-MnO 2 (KMO) nanorods is proposed in this study, and the chemical conversion reactions between H + , Zn 2+ , and MnO 2 are revealed by in situ X-ray diffraction (XRD) and density functional theory (DFT) calculations. The specific capacity of the KMO nanorods at 0.2 A g −1 is 218.1 mA h g −1 . After 130 cycles, the capacity retention is still 100%. Even at 1.0 A g −1 , the capacity of 99.6 mA h g −1 can be maintained after 1400 cycles, revealing the excellent cycling stability and long cycle life of the KMO nanorods.

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An appropriate Zn²⁺/Mn²⁺concentration of the electrolyte enables superior performance of AZIBs

Abstract: Rechargeable aqueous Zn-ion batteries (AZIBs) are promising candidates for large-scale energy storage due to their high capacity, low cost, high safety, and sustainability. However, critical issues, such as the dendrites...

Cited by 9 publications

References 55 publications

Metal–Organic Framework‐Derived MnO/C Nanocomposite with Lamellar Porous Structure for High‐Performance Aqueous Zinc‐Ion Battery

Metal–Organic Framework‐Derived MnO/C Nanocomposite with Lamellar Porous Structure for High‐Performance Aqueous Zinc‐Ion Battery

Electrochemically Active Mn²⁺ Enabling High-Performance Aqueous Zinc Ion Batteries

Batch Synthesis of K-Doped α-MnO₂ Nanorods as Cathode Materials for Aqueous Zinc-Ion Battery

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An appropriate Zn2+/Mn2+concentration of the electrolyte enables superior performance of AZIBs

Abstract: Rechargeable aqueous Zn-ion batteries (AZIBs) are promising candidates for large-scale energy storage due to their high capacity, low cost, high safety, and sustainability. However, critical issues, such as the dendrites...

Cited by 9 publications

References 55 publications

Metal–Organic Framework‐Derived MnO/C Nanocomposite with Lamellar Porous Structure for High‐Performance Aqueous Zinc‐Ion Battery

Metal–Organic Framework‐Derived MnO/C Nanocomposite with Lamellar Porous Structure for High‐Performance Aqueous Zinc‐Ion Battery

Electrochemically Active Mn2+ Enabling High-Performance Aqueous Zinc Ion Batteries

Batch Synthesis of K-Doped α-MnO2 Nanorods as Cathode Materials for Aqueous Zinc-Ion Battery

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An appropriate Zn²⁺/Mn²⁺concentration of the electrolyte enables superior performance of AZIBs

Electrochemically Active Mn²⁺ Enabling High-Performance Aqueous Zinc Ion Batteries

Batch Synthesis of K-Doped α-MnO₂ Nanorods as Cathode Materials for Aqueous Zinc-Ion Battery