MnO2 (α-, β-, γ-) compounds prepared by hydrothermal-electrochemical synthesis: characterization, morphology, and lithium insertion behavior

Hill, Laurie I.; Verbaere, A.; Guyomard, Dominique

doi:10.1016/s0378-7753(03)00238-6

Cited by 89 publications

(76 citation statements)

References 19 publications

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“…The morphologies of the samples were investigated by field emission scanning electron microscopy (FE-SEM; JEOL JSM-7500FA). The Brunauer-Emmett-Teller (BET) surface areas of the synthesized materials were measured by a NOVA 1000 high 25 speed gas sorption analyser (Quantachrome Corporation, USA). Before BET measurements, the samples were degassed in vacuum at 100 °C for at least 12 h. Transmission electron microscope (TEM) images were collected on a JEOL 2011 200 kV instrument, with a JEOL Energy Dispersive X-ray 30 Spectroscopy (EDS) detector and a JEOL EDS software analysis system.…”

Section: Sample Characterizationmentioning

confidence: 99%

“…Great efforts have been made to develop competitive electrode materials for rechargeable lithium batteries with superior electrochemical performance. 4,5 Compared with the development of anode materials, developing cathode materials with good electrochemical performance is even 25 more crucial to meet the requirements of the rapidly increasing portable electronics market, as well as potential applications in EVs and HEVs. 6,7 Lithium transition metal oxide, with the formula of LiMO 2 (M: Mn, Co, and Ni), [8][9][10][11][12][13][14][15] and transition metal phosphate materials (LiFePO 4 ) 16,17 have been widely investigated 30 and reported as cathode materials, especially commercial LiCoO 2 .…”

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: Sample Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2012

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“…Due to these advantages, manganese dioxide has received considerable attention as a cathodic material for primary and secondary batteries. 13) Synthetic manganese dioxides are used in a variety of production fields. From a commercial standpoint, the most important feature of manganese dioxide is that it is electrochemically active.…”

Section: Introductionmentioning

confidence: 99%

Production of Chemical Manganese Dioxide from Lithium Ion Battery Ternary Cathodic Material by Selective Oxidative Precipitation of Manganese

et al. 2013

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We have conducted studies to produce chemical manganese dioxides (CMDs) from ternary cathodic materials by oxidative precipitation. In this study, a cathodic material was concentrated by pretreatment and leached with sulfuric acid to recover 1 L of a leachate containing 22.0 g/dm 3 of Co, 21.6 g/dm 3 of Mn, 24.2 g/dm 3 of Ni, 9.5 g/dm 3 of Li and 8 mg/dm 3 of Al as valuable metals. For selective oxidative precipitation of Mn (II), the leachate was reacted with 1 equivalent of Na 2 S 2 O 8 based on the Mn concentration with stirring at 500 rpm at a temperature of 363 K for 18000 s. As a result of the reaction, it was confirmed that the majority of Mn was precipitated from the solution. XRD, PSA, TGDTA, LECO and ICP analyses were performed to characterize the precipitate. The analytical results revealed the production of a chemical manganese dioxide (CMD) having a chemical composition of 84.60% MnO, 1.40% Co 3 O 4 , 0.11% Li 2 O, 0.25% NiO, 0.02% Al 2 O 3 , 0.06% S and 0.52% Na 2 O, an average particle diameter of 10.7 µm, a crystal form of £-MnO 2 , and a purity of at least 98%.

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“…The main advantages attributed to the technique are improved purity of the products, lower reaction temperature and higher film growth rates [4,[35][36][37][38][39][40][41][42][43]. Moreover, film microstructures can be controlled by changing synthesis parameters such as the electrolyte temperature and composition, current loading time, and current density.…”

Section: Electrochemical-assisted Hydrothermal Crystallizationmentioning

confidence: 99%

“…Hill et al [37] prepared several MnO 2 compounds with different crystalline phase (and phases), as well as a number of different morphologies for the same phase (-MnO 2 ), such as needle-like and rod-like fibers. Different crystalline phase and morphology were obtained by controlling the synthesis parameters such as pH, temperature and applied current density.…”

Section: Electrochemical-assisted Hydrothermal Crystallizationmentioning

confidence: 99%

Synthesis of advanced ceramics by hydrothermal crystallization and modified related methods

Ortíz-Landeros¹,

Gómez-Yáñez²,

López-Juárez³

et al. 2012

J Adv Ceram

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Abstract:The present article aims to give a brief overview about the advantages of the hydrothermal crystallization method for the synthesis of advanced ceramics. Emphasis is given, not only on the conventional hydrothermal crystallization, but also on some of its variants; such as ultrasound-assisted, electrochemical-assisted, microwave-assisted and surfactant-assisted hydrothermal methods which open up new opportunities for the synthesis of ceramic materials with novel properties demanded for advanced applications. In the current work the synthesis of barium titanate (BaTiO 3 ), lithium metasilicate (Li 2 SiO 3 ) and sodium-potassium niobate (Na, K)NbO 3 powders are reported as cases of study.

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MnO2 (α-, β-, γ-) compounds prepared by hydrothermal-electrochemical synthesis: characterization, morphology, and lithium insertion behavior

Cited by 89 publications

References 19 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

Production of Chemical Manganese Dioxide from Lithium Ion Battery Ternary Cathodic Material by Selective Oxidative Precipitation of Manganese

Synthesis of advanced ceramics by hydrothermal crystallization and modified related methods

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MnO2 (α-, β-, γ-) compounds prepared by hydrothermal-electrochemical synthesis: characterization, morphology, and lithium insertion behavior

Cited by 89 publications

References 19 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

Production of Chemical Manganese Dioxide from Lithium Ion Battery Ternary Cathodic Material by Selective Oxidative Precipitation of Manganese

Synthesis of advanced ceramics by hydrothermal crystallization and modified related methods

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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