The Autoxidation of Manganous Hydroxide

Nichols, Ambrose R.; Walton, James H.

doi:10.1021/ja01260a034

Cited by 45 publications

(20 citation statements)

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“…38 Due to the high concentration of manganese ions in the metal sulfate solution and the existence of the residual oxygen in the reaction system, high pH values (high concentration of hydroxide ions) and high reaction temperatures (i.e., 60 C) would facilitate the oxidation of manganese ions during the co-precipitation reaction, leading to the formation of the Mn 3 O 4 phase. 38,39 According to previous studies on co-precipitation reactions, the formation of the hydroxide precursor can be divided into two stages: the nucleation period, in which the hydroxide crystal nucleus is formed, and the growth period, in which the crystal nucleus grows into larger particles. 40 The presence of the ammonia solution leads to the formation of spherical secondary particles based on a dissolution-recrystallization mechanism, 32,41 represented by the following equilibria:…”

Section: Resultsmentioning

confidence: 99%

Monodisperse Li1.2Mn0.6Ni0.2O2 microspheres with enhanced lithium storage capability

Cheng

Chen

et al. 2013

J. Mater. Chem. A

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Monodisperse spherical Mn 0.75 Ni 0.25 (OH) 2 precursors built up from plate-like primary particles have been successfully synthesized by the control of pH values during a co-precipitation reaction. The size of spherical particles, namely the secondary particles, is observed to decrease with increasing pH value from 9.0 to 11.0, and is accompanied by a series of shape changes of the primary particles from closepacked plates to well-exposed nanoplates, and then to nanoparticles. Further lithiation of these hydroxide precursors produces the final lithium-rich layered Li 1.2 Mn 0.6 Ni 0.2 O 2 cathode materials without destroying the morphology of the precursors. Electrochemical measurements show that the spherical cathode material assembled from well-exposed nanoplates exhibits superior rate capability and good cyclability compared to other electrode materials, which can be attributed to its uniform particle size and the favorable shape which facilitates the diffusion of lithium ions. Through the control of the sample morphologies, we provide a simple and effective way to enhance the lithium storage capability of lithium-rich layered oxide cathode materials for high-performance lithium-ion batteries.

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Section: Resultsmentioning

confidence: 99%

Monodisperse Li1.2Mn0.6Ni0.2O2 microspheres with enhanced lithium storage capability

Cheng

Chen

et al. 2013

J. Mater. Chem. A

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“…This excess of alkali in the preparation process as well as the presence of oxygen during precipitation reaction has been recognized to facilitate the formation of compounds containing manganese and oxygen elements [20]. First, the excess in Li is intended to compensate the loss of lithium through evaporation during the calcination.…”

Section: Sample Preparationmentioning

confidence: 99%

Minimization of the cation mixing in Li1+x(NMC)1−xO2 as cathode material

Zhang

Jiang

Mauger

et al. 2010

Journal of Power Sources

368

252

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“…MnO 2 /Mn 3 O 4 ratio depends on the oxidation conditions [43]. During electrodeposition, evolution of hydrogen gas occurs on the working electrode.…”

Section: Formation Mechanismmentioning

confidence: 99%