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Multi boron-doping effects in hard carbon toward enhanced sodium ion storage

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Journal of Energy Chemistry 2025年第1期100卷 730-738页

作者： Peng Zheng Wang Zhou Ying Mo Biao Zheng Miaomiao Han Qin Zhong Wenwen Yang Peng Gao Lezhi Yang Jilei Liu co.lege of Materials Science and Engineering Hunan Joint International Laboratory of Advanced Materials and Technology for Clean Energy Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology Hunan University Greater Bay Area institute for Innovation Hunan University Changsha research institute of Mining & Metallurgy co. LTD.

Hard carbon （HC） has been co.sidered as promising anode material for sodium-ion batteries （SIBs）.The optimization of hard carbon’s microstructure and solid electrolyte interface （SEI） property are demonstrated effective in enhancing the Na+storage capability,however,a one-step regulation strategy to achieve simultaneous multi-scale structures optimization is highly ***,we have systematically investigated the effects of boron doping on hard carbon’s microstructure and interface chemistry.A variety of structure characterizations show that appropriate amount of boron doping can increase the size of closed pores via rearrangement of carbon layers with improved graphitization degree,which provides more Na+storage ***-situ Fourier transform infrared spectrosco.y/electrochemical impedance spectrosco.y （FTIR/EIS） and X-ray photoelectron spectrosco.y （XPS） analysis demonstrate the presence of more BC3and less B–C–O structures that result in enhanced ion diffusion kinetics and the formation of inorganic rich and robust SEI,which leads to facilitated charge transfer and excellent rate *** a result,the hard carbon anode with optimized boron doping co.tent exhibits enhanced rate and cycling *** general,this work unravels the critical role of boron doping in optimizing the pore structure,interface chemistry and diffusion kinetics of hard carbon,which enables rational design of sodium-ion battery anode with enhanced Na+storage performance.

关键词： X ray photoelectron spectrosco.y

Thermodynamic simulation of the effect of slag chemistry on the co.rosion behavior of alumina–chromia refractory

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International Journal of Minerals,Metallurgy and Materials 2016年第12期23卷 1458-1465页

作者： Shi-xian Zhao Bin-li Cai Hong-gang Sun Gang Wang Hong-xia Li Xiao-yan Song State Key Laboratory of Advanced refractories Sinosteel Luoyang Institute of Refractories Research Co. Ltd. School of Materials Science and Engineering Beijing University of Technology

The co.rosion behavior of alumina-chromia refractory against two kinds of industrial slags （co.l slag and iron smelting slag） at 1550℃ was investigated via thermodynamic simulations. In the proposed simulation model, the initial slag first attacks the matrix and surface aggregates and subsequently attacks the inner aggregates. The simulation results indicate that the slag chemistry strongly affects the phase formation and co.rosion behavior of the refractory brick. Greater amounts of alumina were dissolved and spinel solid phases formed when the brick interacted with iron smelting slag. These phenomena, as well as the calculated lower visco.ity, may lead to much deeper penetration than that exhibited by co.l slag and to more severe co.rosion co.pared to that induced by co.l slag. The thermodynamic calculations well match the experimental observations, demonstrating the efficiency of the proposed simulation model for evaluating the co.rosion behavior of alumina-chromia refractory.

关键词： thermodynamic analysis simulation co.rosion spinel alumina chromia refractories

Synthesis Process of MgO-CaO Clinkers and Surface Modification

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China's refractories 2014年第3期23卷 35-39页

作者： HU Piao WANG Jing YU Lingyan sinosteel luoyang institute of refractories research co. Ltd.

The MgO - CaO clinkers were prepared by light burnt and calcining Yanfeag dolomite （〈 0. 088 and 〈 0. 045 mm） , and then were modified via hydration carhonation technology. Th, e synthesis co.ditions including particle size of the starting materials, the light burnt and calcining temperatures were optimized. The morphology of the modified clinkers surface was observed via SEM, the growth pattern and crystal morphology of the modifled layer and the hydration resistance of the clinkers u,ere researched. The results show that ：（1） the suitable light burnt temperature is 850 ℃ ; （2） the suitable cal- cining temperature is 1 650 ℃; （ 3 ） after hydration carbonation, a dense and uniform Caco. layer with a certain thickness is jormed on the surface of the clinkers; prolonging the modtfieation duration can obviously en- hance the hydration resistance of the clinkers; particle size plays an important role in the formation and growth of Caco. on the surface.

关键词： dolomite synthesized periclase- lime calcining tempera- modifiealion

Key Points of Monolithic Lining Engineering of Rotary Kilns

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China's refractories 2018年第4期27卷 21-25页

作者： LIU Wentao ZHU Xiaodong XU Zhimin ZHU Huailing sinosteel luoyang institute of refractories research co. Ltd.

There are many factors affecting the monolithic lining engineering of rotary kilns,resulting in the difficult quality *** this paper,the key points of the whole lining engineering were discussed from the aspects of li... 详细信息

关键词： rotary kiln refractories lining structural design co.struction baking

Steam Oxidation Resistance co.parison of Several Silico. Carbide refractories at Elevated Temperatures

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China's refractories 2023年第2期32卷 18-23页

作者： WANG Jiaping WU Jiguang HUANG Zhigang LYU Chunjiang WANG Wenwu sinosteel luoyang institute of refractories research co. Ltd.Luoyang 471039China

The oxidation tests of different SiC refractories including Si3N4-SiC bricks,Si3N4-Si2N2O-SiC bricks from China(SNO-1),Si3N4-Si2N2O-SiC bricks from overseas(SNO-2),SiAlON-SiC bricks,oxides bonded SiC bricks,self-bonded SiC bricks as well as SiC castables were carried out in the steam atmosphere(1 000 ℃,32 kg·m-3·h-1)for different durations(100,200,300,400 and 500 h).The mass,the volume,the bulk density and the apparent porosity before and after the oxidation were *** XRD and SEM analyses were *** results indicate that:(1)under the steam atmosphere co.dition(1 000 ℃,32 kg·m-3·h-1),as the oxidation time increases from 0 to 500 h,the volume and the mass of the silico. carbide refractories increase,while the bulk density decreases;in terms of the apparent porosity,oxides bonded SiC bricks and SiC castables present an increasing trend,Si3N4-SiC bricks,SiAlON-SiC bricks and self-bonded SiC bricks present an increasing trend first and then a decreasing trend,and Si3N4-Si2N2O-SiC bricks present a decreasing trend or a trend of decreasing first and then increasing;(2)as for Si3N4-Si2N2O-SiC bricks,SNO-1 and SNO-2 have basically the same chemical and phase co.position,SNO-2 has the lower mass change rate than SNO-1 during oxidation from 200-500 h,which indicates that SNO-2 has the better steam oxidation resistance than SNO-1.

关键词： silico. carbide refractories steam oxidation resistance

Influence of Temperature co.ditions on Dynamic Young’s Modulus Testing

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China's refractories 2019年第3期28卷 19-21页

作者： SONG Yanyan HU Piao LI Ruhang LI Xiaorui sinosteel luoyang institute of refractories research co. Ltd.

The Young’s modulus was measured at high temperatures by impulse excitation of vibration method,and the effects of heating rate,holding time and temperature cycle on the test results were *** results show that the heating rate has obvious effect on the high temperature Young’s modulus of the green body,but has no obvious effect on that of the sintered products;the holding time of the heating process has no regular effect on the Young’s modulus,and the effect varies with the different products at a certain temperature;the method can also be used to test the Young’s modulus during co.ling process.

关键词： dynamic Young’s modulus heating rate holding time temperature cycle

Alkali Vapor co.rosion of Different refractories at High Temperatures

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China's refractories 2023年第2期32卷 24-30页

作者： FAN Muxu HOU Xiaojing FENG Zhiyuan WANG Han LIU Pengcheng SHI Gan sinosteel luoyang institute of refractories research co. Ltd.Luoyang 471039China

co.mercial high purity co.undum brick,co.undum-mullite brick,mullite brick,calcium hexaaluminate brick and calcium hexaaluminate-co.undum brick were studied to investigate their reaction state and alkali vapor co.rosion mechanism at 1370 and 1500℃.The results show that:(1)served in hot alkali vapor,the high-purity co.undum brick has no obvious slag layer but expands dramatically;(2)the co.undum-mullite brick shows obvious reactive expansion at 1370℃and melting co.rosion happens at 1500℃;(3)at 1370℃alkali vapor and mullite brick react and form a slag layer without volume effect;when the temperature increases to 1500℃,the reaction melting co.rosion intensifies;(4)the calcium hexaaluminate brick and the calcium hexaaluminate-co.undum brick form a thin slag layer in alkali vapor,and the sample surface absorbs Na+to form a dense layer with small volume effect.

关键词： alkali vapor co.rosion sodium carbonate calcium hexaaluminate co.undum mullite

Development and Application of Chrome-free Refractory Materials for RH Degasser

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China's refractories 2014年第4期23卷 1-5,12页

作者： LI Hongxia LIU Jun FENG Haixia ZHANG Lixin sinosteel luoyang institute of refractories research co. Ltd. State Key Laboratory of Advanced refractories sinosteel Refractory co. Ltd.

The research progress and industrial application of chrome-free refractories for RH degasser were introduced in the *** is proved that unburned magnesia-spinel refractories used for RH throat and snorkel in Baosteel have longer service life co.pared with traditional direct bonded fused magnesia-chrome *** new developed chrome-free unburned magnesia-spinel co.posite can fully meet the present demand for RH operation and can be applied extensively for RH *** present,instead of chrome-co.taining materials,chrome-free refractories have been applied widely for RH in *** low carbon MgO-C material with high mechanical properties at mild and high temperatures can be an alternative chrome-free material for RH.

关键词： RH degasser chrome-free refractories unburned magnesia-spinel materials

Synthesis and electrochemical characteristics of xLi_2MnO_3·(1-x)Li(Ni_(1/3)co.(1/3)Mn_(1/3))O_2 co.pounds

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International Journal of Minerals,Metallurgy and Materials 2009年第4期16卷 458-462页

作者： Ling-yan Yu Wei-hua Qiu Jia-yuan Huang Fang Lian School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China sinosteel luoyang institute of refractories research co. Ltd. Luoyang 471039 China

xLi2MnO3·（1-x）Li（Ni1/3co./3Mn1/3）O2 （x=0.25, 0.40, 0.55） co.pounds were prepared by low-heating solid state reaction. In the voltage range of 2.70-4.35 V, the discharge capacity of the electrode decreased with the increase of x, with a better cyclability. However, when cycled between 2.7 and 4.6 V, the cathodes delivered much larger capacities and their capacities increased with the introduction of Li2MnO3. Moreover, it was found that the discharge capacity gradually increased with the cycle number. The reason for this phenomenon was discussed. It was found that the relatively low cut-off potential made the activation of the Li2MnO3 co.ponent in the co.pound a gradual process, which caused the increasing capacity.

关键词： lithium-ion batteries cathode materials synthesis method layered oxides