Mechanical activation of graphite in air: A way to advanced carbon nanomaterials

Бакланова, О. Н.; Дроздов, В. А.; Лавренов, А. В.; Василевич, А. В.; Муромцев, И. В.; Тренихин, М. В.; Арбузов, А. Б.; Likholobov, V. A.; Горбунова, О.В.

doi:10.1016/j.jallcom.2015.05.090

Cited by 17 publications

(3 citation statements)

References 20 publications

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“…Although the SSA of Si-RGO@Graphite was reduced compared to Si-RGO and Si-RGO-900, the SSA of the sample is still higher than that reported graphite value without mechanofusion or milling process, which still confirms the porous structure of the material. 20 The large SSA of Si-RGO@Graphite over graphite may fasten the lithium-ions diffusion between the electrolyte and active material while shortening the diffusion path length for lithium ions and electrons, enhancing the charge/discharge capacity. 21,22 Figure 3a shows the X-ray Photoelectron Spectroscopy (XPS) spectra of as-synthesized materials.…”

Section: Resultsmentioning

confidence: 99%

Graphene Aerogel-encapsulated Silicon Nanoparticles Mechanofused on Graphite without Prelithiation for Cylindrical Ni-rich NMC811 Li-ion Batteries

Kongsawatvoragul¹,

Bunyanidhi²,

Jangsan³

et al. 2022

J. Electrochem. Soc.

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Silicon (Si), one of the promising anodes, provides a high theoretical specific capacity of ca. 3500 mAh g-1 at room temperature. However, it experiences many drastic issues such as cost-effectiveness, large volume expansion, and unstable thick solid–electrolyte interfaces (SEI), leading to poor cycling stability. A small amount of Si has recently been added to graphite and used as the anode for commercial Li-ion batteries. Nevertheless, the intrinsic issues of Si still occur. Here, we encapsulated Si nanoparticles with reduced graphene oxide (RGO) aerogel and added them to graphite to obtain Si-RGO@Graphite using a dry coating mechanofusion. This technique enhances the strong binding of those materials. We also demonstrated the practical use of the as-prepared Si-RGO@Graphite (9.9:0.1:90.0 wt.% of Si:RGO:Graphite) anode coupling with Ni-rich NMC811 cathode at an 18650 cylindrical cell level. In this attempt, we avoided using an expensive vacuum-required prelithiation process, which currently inhibits the practical and commercial use of the Si-based anode. We believe this new composite material may be useful for high-energy LIBs in the future.

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Section: Resultsmentioning

confidence: 99%

Graphene Aerogel-encapsulated Silicon Nanoparticles Mechanofused on Graphite without Prelithiation for Cylindrical Ni-rich NMC811 Li-ion Batteries

Kongsawatvoragul¹,

Bunyanidhi²,

Jangsan³

et al. 2022

J. Electrochem. Soc.

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“…Важливу роль в реалізації процесу відновлення відіграють твердофазні реакції [16,20]. Автори [21] приділили увагу розгляду впливу механічної активації графіту в повітрі як шлях до одержання вуглецевих наноматеріалів. В даній роботі на результатах експериментальних досліджень розглянуто зміни властивостей графіту під механічною дією та показано, що механічна дисперсія супроводжується безперервним розщепленням частинок з утворенням нової твердої поверхні, яка спочатку не має адсорбційних шарів і, таким чином, є високореакційною, і нових активних ділянок різного характеру.…”

Section: обговорення результатів дослідженняunclassified

Mechanical grinding of components of silicone manganese charge to improve the reproducibility

Myanovskaya¹,

Proyak²,

Kamkina³

et al. 2020

MPM

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The present state of smelting of ferrosilicon manganese due to the deterioration of the quality of manganese concentrates is characterized by low extraction of manganese, silicon and an increase in the slag multiplicity. This requires the improvement of smelting technology with the use of charge materials with high reactivity, which is ensured by their preliminary preparation for melting.One method of preparation may be the method of mechanical activation of components separately or joint activation to provide high rates of the degree of recovery of elements in the metal phase.In order to attract mechanically activated fine materials for smelting of si-licomanganese, the basic technological requirements of preliminary preparation of briquetting briquette are grounded. Using hydrolysis lignin as a binder provides strong briquettes. At pressing pressures of 450-550 kg/cm2, the strength of the raw braces is 65-68 kg/cm2, and the fired in a reducing atmosphere at temperatures up to 1000оС, the strength reaches 160-185 kg/cm2.The study of the kinetics of joint carbon-thermal reduction of manganese and silicon at temperatures of 1250-1600 ° C with continuous weight loss control of the charge batch shows that the degree of recovery of the fractured, mechanically activated charge is 1.5 - 1.8 times higher than the reproducibility of the charge component 3- 0 mm and 2-3 times higher than the degree of recovery of the factory charge.Based on the results of chemical analysis of the experimental metal samples, it is shown that the application of mechanical activation in the joint processing of the mixture is significantly higher characteristics of extraction of manganese in the alloy by reducing the pre-formation of the slag phase and the recovery in this case of manganese from the slag melt

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“…Аналогичным образом в процессе МА изменяется и удельная поверхность. В статье [4] авторами на примере синтетического графита показано, что размер частиц графита в процессе механической активации снижается с 28 до 7 мкм в течение 3-30 мин МА. Увеличение времени МА до 60 мин приводит к агрегированию частиц графита и увеличению размеров частиц до 10-12 мкм.…”

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Влияние Механической Активации На Свойства Носителей И Катализаторов Нефтепереработки

Бакланова¹,

Лавренов²,

Василевич³

et al. 2019

РХЖ

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The analysis of scientific publications and patents devoted to mechanochemical synthesis of inorganic supports and catalysts of oil processing processes: cracking, reforming, hydrotreating and hydrocracking is carried out. It s shown that the introduction of mechanical activation into the technological process of synthesis of inorganic supports and catalysts, as a rule, leads to an increase in catalytic activity and selectivity. Features of mechanochemical synthesis of complex nickel-molybdenum oxides, which are precursors of sulfide nickel-molybdenum hydrotreating catalysts, were considered. It is shown that under conditions of mechanical activation, it is possible to obtain a nickel-molybdenum highly active and thermostable β-NiMoO4, in which Mo is in a tetrahedral conformation. The technology of obtaining highly dispersed carbide-containing catalysts developed using the IHCP SB RAS using the method of mechanical activation is described. The texture and morphology of synthesized highly disperse massive carbide-containing catalysts are considered. It is shown that the size of active particles is 2–5 nm. Model catalytic tests have been carried out and it has been established that carbide-containing highly disperse catalysts exhibit high catalytic activity in the model hydrodesulphurization reaction of dibenzothiophene.

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Mechanical activation of graphite in air: A way to advanced carbon nanomaterials

Cited by 17 publications

References 20 publications

Graphene Aerogel-encapsulated Silicon Nanoparticles Mechanofused on Graphite without Prelithiation for Cylindrical Ni-rich NMC811 Li-ion Batteries

Graphene Aerogel-encapsulated Silicon Nanoparticles Mechanofused on Graphite without Prelithiation for Cylindrical Ni-rich NMC811 Li-ion Batteries

Mechanical grinding of components of silicone manganese charge to improve the reproducibility

Влияние Механической Активации На Свойства Носителей И Катализаторов Нефтепереработки

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