Facile synthesis of NaV6O15 nanorods and its electrochemical behavior as cathode material in rechargeable lithium batteries

Liu, Haimei; Wang, Yonggang; Li, Liang; Wang, Kai‐Xue; Hosono, Eiji; Zhou, Haoshen

doi:10.1039/b912906e

Cited by 137 publications

(140 citation statements)

References 47 publications

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“…The XRD peaks become sharper and more intense with increasing synthesis temperature, suggesting enhancement of the crystallinity. 29 However, the XRD peak of KMO-130 is weaker 70 than that of KMO-120, probably because the higher temperature has destroyed the morphological structure of the material. The chemical compositions of the as-prepared products were analyzed by using inductively coupled plasma/atomic emission spectroscopy (ICP/AES).…”

Section: Resultsmentioning

confidence: 99%

“…5a and b, KMO-120 exhibits 65 the best electrochemical performance and cycling stability, probably due to two reasons: the single crystalline nature of its nanofibers (shown in Fig. 4d), 29,37,38 and its larger surface area, 4 which is 84.2 m 2 g -1 (71.7, 68.2, and 67.6 m 2 g -1 for KMO-110, KMO-100, and KMO-80, respectively), as estimated by the BET method. For the above-mentioned reasons, all of the following work is based on KMO-120 unless otherwise noted.…”

Section: Resultsmentioning

confidence: 99%

“…5d, the capacities of the K 0.25 Mn 2 O 4 electrodes kept rising at the initial stage, except for the first few cycles, which is similar to the phenomenon that occurs in NaV 6 O 15 electrode. 29 It is assumed that the potassium ions in the 75 tunnels were de-intercalated during the charging process in the initial stage and then more lithium ions could be intercalated into the K 0.25 Mn 2 O 4 electrode in the following discharge process. Thus, the amount of K + in the K 0.25 Mn 2 O 4 electrode before and after the charge-discharge process is significant for investigating 80 the behavior of K + in the charge-discharge procedure.…”

Section: Resultsmentioning

confidence: 99%

“…[32][33][34][35][36] Single-crystalline K 0.25 Mn 2 O 4 could be suitable as a cathode material for lithium ion batteries because its potassium ions can not only maintain the structure, but also increase the ion diffusion rate. [26][27][28][29][30] Solution B was prepared by dissolving 1.5 g of oxone in 10 mL of double de-ionized water. After the mixing of the two solutions, the resultant mixture was then transferred to an autoclave and kept in an oven at 80 °C for 20 hours.…”

Section: Introductionmentioning

confidence: 99%

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K_0.25Mn₂O₄nanofiber microclusters as high power cathode materials for rechargeable lithium batteries

et al. 2012

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, HK (2012), K0.25Mn2O4 nanofiber microclusters as high power cathode materials for rechargeable lithium batteries, RSC Advances, 2(4), pp. 1643-1649. K0.25Mn2O4 nanofiber microclusters as high power cathode materials for rechargeable lithium batteries Abstract K 0.25 Mn 2 O 4 microclusters assembled from single-crystalline nanofibers were synthesized via a hydrothermal process at different temperatures. The possibility of using these materials as cathode material for lithium ion batteries was studied for the first time. The charge/discharge results showed that the K 0.25 Mn 2 O 4 nanofiber microclusters synthesized at 120 degrees C exhibit excellent lithium storage properties, with a high reversible capability (360 mA h g -1 at current density of 100 mA g -1 ) and stable lithium-ion insertion/de-insertion reversibility. The charge/discharge mechanism in lithium ion batteries was studied and proposed for the first time. During the charge process, K + was extracted from the electrode, which made active vacated sites suitable for lithium ion intercalation and was beneficial for increasing capacity. microclusters assembled from single-crystalline nanofibers were synthesized via a hydrothermal process at different temperatures. The possibility of using these materials as cathode material for lithium ion batteries was studied for the first time. The charge/discharge results showed that the K 0.25 Mn 2 O 4 nanofiber microclusters synthesized at 120°C exhibit excellent lithium storage properties, with a high reversible capability (360 mA h g -1 at current density of 100 mA g -1 ) and stable lithium-ion insertion/de-insertion reversibility. The charge/discharge mechanism in lithium ion batteries was studied and proposed for the first time. During the charge 10 process, K + was extracted from the electrode, which made active vacated sites suitable for lithium ion intercalation and was beneficial for increasing capacity.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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K_0.25Mn₂O₄nanofiber microclusters as high power cathode materials for rechargeable lithium batteries

et al. 2012

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“…Vanadium oxide bronzes were prepared by hydrothermal synthesis according to a previously reported procedure [11,18]. V2O5 was dispersed in water (10 ml/gV2O5) and then 30% H2O2 and MeCl salt (Me= Ag, Cu, Ca and Na), with a Me/V atomic ratio of 0.17, were added under magnetic stirring at room temperature (see also supporting 5 information).…”

Section: Catalyst Preparationmentioning

confidence: 99%

Partial oxidation of hydrogen sulfide to sulfur over vanadium oxides bronzes

et al. 2016

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V NMR results, Ag0.35V2O5 and Na0.33V2O5 (or NaV6O15) bronzes with a minority presence of V2O5 were mainly obtained in the case of Ag-and Na-containing materials in samples both heat-treated in air or in N2 atmosphere. In the case of Cu-and Ca-containing samples, V2O5 was mainly observed in samples calcined in air.However, Cu0.26V2O5 and Ca0.17V2O5 bronzes, with the minority presence of V2O5, have been observed in Cu-and Ca-containing samples heat-treated in N2. On the other hand, the catalytic behavior strongly depends on the metal promoter. Thus catalysts presenting vanadium oxide bronzes, i.e. samples presenting Ag0.35V2O5, NaV6O15, Cu0.26V2O5 or Ca0.17V2O5 shows a catalytic activity during the partial oxidation of H2S to sulfur higher than that observed over pure V2O5 or over promoted catalysts presenting mainly V2O5 (i.e. Cu-or Ca-containing samples calcined in air). Moreover, some differences in the selectivity to sulfur were observed. A higher formation of SO2 at high reaction temperature has been favored over Ag0.35V2O5 -containing catalyst. This different behavior between samples could be explained by the presence of metallic Ag on the surface of Ag0.35V2O5, which was detected by XRD. Also, higher formation of SO2 is favored in the case of catalyst heat-treated in N2, in which the presence of VO2, as minority, could have a role in combustion of sulfur. Accordingly, this work should be considered as a first approach to relate catalytic activity of the Me-containing vanadium 3 oxide bronze (containing Ag, Cu, Ca and Na) for the selective oxidation of hydrogen sulfide.Keywords: Ag0.35V2O5, NaV6O15, Ca0.17V2O5 bronzes; selective oxidation of hydrogen sulfide to sulfur; Na-, Ag-, Ca-or Cu-doped catalysts, vanadium oxide bronze.

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The Capturing of Ionized Oxygen in Sodium Vanadium Oxide Nanorods Cathodes under Operando Conditions

Yan

Zhao

et al. 2016

Adv Funct Materials

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The control of voltage window has been considered as a universal strategy in improving the cycling stability of cathode materials, which is supposed and explained by avoiding side reactions. To address the conjecture, the detailed structure evolution of Na0.76V6O15 nanorods is investigated with different electrochemical reaction voltage windows. High time resolution in situ X‐ray diffraction, ex situ X‐ray photoelectron spectroscopy, ex situ Raman spectroscopy, and transmission electron microscopy demonstrate the amorphization of Na0.76V6O15 nanorods and formation of ionized oxygen in nanorods, leading to the increased polarization voltage and fast capacity fading. The amorphization and diffusion of ionized oxygen in nanorods is controlled by optimizing the voltage window, resulting in the great increase of capacity retention from 26% to 80%. It is demonstrated that controlling the voltage window and corresponding ionized oxygen diffusion can mitigate the fast capacity fading to achieve long lasting lithium ion batteries.

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Facile synthesis of NaV6O15 nanorods and its electrochemical behavior as cathode material in rechargeable lithium batteries

Cited by 137 publications

References 47 publications

K_0.25Mn₂O₄nanofiber microclusters as high power cathode materials for rechargeable lithium batteries

K_0.25Mn₂O₄nanofiber microclusters as high power cathode materials for rechargeable lithium batteries

Partial oxidation of hydrogen sulfide to sulfur over vanadium oxides bronzes

The Capturing of Ionized Oxygen in Sodium Vanadium Oxide Nanorods Cathodes under Operando Conditions

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Facile synthesis of NaV6O15 nanorods and its electrochemical behavior as cathode material in rechargeable lithium batteries

Cited by 137 publications

References 47 publications

K0.25Mn2O4nanofiber microclusters as high power cathode materials for rechargeable lithium batteries

K0.25Mn2O4nanofiber microclusters as high power cathode materials for rechargeable lithium batteries

Partial oxidation of hydrogen sulfide to sulfur over vanadium oxides bronzes

The Capturing of Ionized Oxygen in Sodium Vanadium Oxide Nanorods Cathodes under Operando Conditions

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K_0.25Mn₂O₄nanofiber microclusters as high power cathode materials for rechargeable lithium batteries

K_0.25Mn₂O₄nanofiber microclusters as high power cathode materials for rechargeable lithium batteries