Structural water engaged disordered vanadium oxide nanosheets for high capacity aqueous potassium-ion storage

Charles, Daniel S.; Feygenson, Mikhail; Page, Katharine; Neuefeind, Jöerg C.; Xu, Wenqian; Teng, Xiaowei

doi:10.1038/ncomms15520

Cited by 143 publications

(95 citation statements)

References 29 publications

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“…From these observations, the as-obtained S4 sample was determined to be a special monoclinic-NaMnO 2− y − δ (OH) 2 y with new polymorph consisting of both H′3 and O′3. The rearranged metal–oxygen (Mn–O) layers are not sufficiently close-packed with coexistence of two phases, which is different from that of normal monoclinic mentioned in the literature 7 , probably resulting in the suppression of Jahn–Teller distortion from the framework of MnO 6 octahedra 21 , 22 . The formation of Mn–O–H bonds in hexahedra in S4 is speculated to be related to the “hydrothermal sodiation” process, which is illustrated in Fig.…”

Section: Resultsmentioning

confidence: 79%

A monoclinic polymorph of sodium birnessite for ultrafast and ultrastable sodium ion storage

et al. 2018

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Sodium transition metal oxides with layered structures are attractive cathode materials for sodium-ion batteries due to their large theoretical specific capacities. However, these layered oxides suffer from poor cyclability and low rate performance because of structural instability and sluggish electrode kinetics. In the present work, we show the sodiation reaction of Mn3O4 to yield crystal water free NaMnO2−y−δ(OH)2y, a monoclinic polymorph of sodium birnessite bearing Na/Mn(OH)8 hexahedra and Na/MnO6 octahedra. With the new polymorph, NaMnO2−y−δ(OH)2y exhibits an enlarged interlayer distance of about 7 Å, which is in favor of fast sodium ion migration and good structural stability. In combination of the favorable nanosheet morphology, NaMn2−y−δ(OH)2y cathode delivers large specific capacity up to 211.9 mAh g–1, excellent cycle performance (94.6% capacity retention after 1000 cycles), and outstanding rate capability (156.0 mAh g–1 at 50 C). This study demonstrates an effective approach in tailoring the structural and electrochemical properties of birnessite towards superior cathode performance in sodium-ion batteries.

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Section: Resultsmentioning

confidence: 79%

A monoclinic polymorph of sodium birnessite for ultrafast and ultrastable sodium ion storage

et al. 2018

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“…As promising energy‐storage devices, potassium‐ion batteries (PIBs) using the earth‐abundant and low‐cost potassium have become a hot spot recently because of their lower negative redox potential and high working voltage . Hence, intensive works have been reported to explore suitable electrode materials for PIBs . Recently, various anode materials such as graphite, graphene, and transition metal compounds have been reported for PIBs.…”

Section: Introductionmentioning

confidence: 99%

3D Sulfur and Nitrogen Codoped Carbon Nanofiber Aerogels with Optimized Electronic Structure and Enlarged Interlayer Spacing Boost Potassium‐Ion Storage

Liu

et al. 2019

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Carbonaceous materials are promising anodes for potassium‐ion batteries (PIBs). However, it is hard for large K ions (1.38 Å) to achieve long‐distance diffusion in pristine carbonaceous materials. In this work, the following are synthesized: S/N codoped carbon nanofiber aerogels (S/N‐CNFAs) with optimized electronic structure by S/N codoping, enhanced interlayer spacing by S doping, and a 3D interconnected porous structure of aerogel, through a pyrolysis sustainable seaweed (Fe‐alginate) aerogel strategy. Specifically, the S/N‐CNFAs electrode delivers high reversible capacities of 356 and 112 mA h g−1 at 100 and 5000 mA g−1, respectively. The capacity reaches 168 mA h g−1 at 2000 mA g−1 after 1000 cycles. A full cell with a S/N‐CNFAs anode and potassium prussian blue cathode displays a specific capacity of 198 mA h g−1 at 200 mA g−1. Density functional theory calculations indicate that S/N codoping is beneficial to synergistically improve K ions storage of S/N‐CNFAs by enhancing the adsorption of K ions and reducing the diffusion barrier of K ions. This work offers a facile heteroatom doping paradigm for designing new carbonaceous anodes for high‐performance PIBs.

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“…[3,6,7] All these merits ensure KIBs provide clean energy with low cost and high energy density. [10,11] As reported by Amine's group, stabilizing the material surface is the key factor for cycling Li-ion batteries at high temperatures such as 55 °C. The conversion electrodes suffer from a large volume change that is tremendously significant in KIBs, [4,8,9] while the capacity of the intercalation electrodes is very low.…”

mentioning

confidence: 96%

An Organic Anode for High Temperature Potassium‐Ion Batteries

Liang

Luo

Wang

et al. 2018

Advanced Energy Materials

184

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exceptional battery performance is still a significant challenge at high temperatures due to the structural degradation caused by the fast transfer of alkali-ions. [4] Therefore, Li-ion batteries have been intensively investigated as high temperature batteries owing to the smallest ion size of Li among the alkali-ions. [4,5] Nevertheless, the scarcity and unevenly global distribution of Li resource is an obstacle for the further development of Li-ion batteries. [3,6] One promising strategy to replace Li-ion batteries is developing hightemperature K-ion batteries (KIBs), which have distinguished advantages among alkali-ion batteries, e.g., the significantly more abundance of K than Li (2.09 vs 0.0017 wt% in the Earth crust) and lower redox potential of K + /K than Na + /Na (−2.93 vs −2.71 V). [3,6,7] All these merits ensure KIBs provide clean energy with low cost and high energy density. However, the larger ion size of K + than Li + and Na + results in a significant structural deterioration for the conversion and intercalation electrodes. The conversion electrodes suffer from a large volume change that is tremendously significant in KIBs, [4,8,9] while the capacity of the intercalation electrodes is very low. [10,11] As reported by Amine's group, stabilizing the material surface is the key factor for cycling Li-ion batteries at high temperatures such as 55 °C. [12] Thus, it is extremely challenging for KIB electrodes to withstand a temperature above 55 °C, due to the less stable solid electrolyte interphase (SEI) compared to the Li counterpart. [13] Herein, we designed an organic anode that stores K-ions through surface reaction for high-temperature KIBs beyond the current operating temperature of 55 °C with high rate capability and long cycle life. Azobenzene-4,4′-dicarboxylic acid potassium salts (ADAPTS) with a redox center of azo group (NN) is selected to reversibly react with K + , as shown in Figure 1a. Different from the conversion and intercalation reactions, ADAPTS with surface reaction can largely retain the structural stability during the reversible electrochemical reactions between azo group and K + even at a high temperature. Furthermore, organic compounds are ideal electrode materials for clean energy applications since they are inexpensive and sustainable. [14,15] At the ambient temperature, the ADAPTS anode delivers a reversible capacity of 109 mAh g −1 at 0.1C for 100 cycles and a long-term cycle life of 1000 cycles is achievedThe wide applications of rechargeable batteries require state-of-the-art batteries that are sustainable (abundant resource), tolerant to hightemperature operations, and excellent in delivering high capacity and longterm cycling life. Due to the scarcity and uneven distribution of lithium, it is urgent to develop alternative rechargeable batteries. Herein, an organic compound, azobenzene-4,4′-dicarboxylic acid potassium salts (ADAPTS) is developed, with an azo group as the redox center for high performance potassium-ion batteries (KIBs). The extended π-conjugated structure i...

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Structural water engaged disordered vanadium oxide nanosheets for high capacity aqueous potassium-ion storage

Cited by 143 publications

References 29 publications

A monoclinic polymorph of sodium birnessite for ultrafast and ultrastable sodium ion storage

A monoclinic polymorph of sodium birnessite for ultrafast and ultrastable sodium ion storage

3D Sulfur and Nitrogen Codoped Carbon Nanofiber Aerogels with Optimized Electronic Structure and Enlarged Interlayer Spacing Boost Potassium‐Ion Storage

An Organic Anode for High Temperature Potassium‐Ion Batteries

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