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Anion storing,oxygen vacancy incorporated perovskite oxide composites for high-performance aqueous dual ion hybrid supercapacitors

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Journal of Energy Chemistry 2024年第7期94卷 646-655页

作者： Taehun Kang Puritut Nakhanivej Kyung Jae Wang Yu Chen Yongchul G Chung Ho Seok Park School of Chemical Engineering Sungkyunkwan University(SKKU)2066Seobu-roJangan-guSuwonGyeonggi-do 16419Republic of Korea Warwick Manufacturing Group(wmg) University of WarwickCoventry CV47ALUnited Kingdom School of Chemical Engineering Pusan National UniversityGeumjeong-guBusanGyeongsangnam-do 46241Republic of Korea SKKU Institute of Energy Science and Technology(SIEST) Sungkyunkwan University2066SeoburoJangan-guSuwon 440-746Republic of Korea SKKU Advanced Institute of Nano Technology(SAINT) Sungkyunkwan University2066SeoburoJangan-guSuwon 440-746Republic of Korea Department of Health Sciences and Technology Samsung Advanced Institute for Health Sciences and Technology(SAIHST)Sungkyunkwan UniversitySuwon 16419Republic of Korea

Dual ion storage hybrid supercapacitors(HsCs)are considered as a promising device to overcome the limited energy density of existing supercapacitors while preserving high power and long cyclability.However,the development of high-capacity anion-storing materials,which can be paired with fast charg-ing capacitive electrodes,lags behind cation-storing counterparts.Herein,we demonstrate the surface faradaic OH-storage mechanism of anion storing perovskite oxide composites and their application in high-performance dual ion HsCs.The oxygen vacancy and nanoparticle size of the reduced LaMnO_(3)(r-LaMnO_(3))were controlled,while r-LaMnO_(3) was chemically coupled with ozonated carbon nanotubes(oCNTs)for the improved anion storing capacity and cycle performance.As taken by in-situ and ex-situ spectroscopic and computational analyses,OH-ions are inserted into the oxygen vacancies coordi-nating with octahedral Mn with the increase in the oxidation state of Mn during the charging process or vice versa.Configuring OH-storing r-LaMnO_(3)/oCNT composite with Na*storing MXene,the as-fabricated aqueous dual ion HSCs achieved the cycle performance of 73.3%over 10,000 cycles,delivering the max-imum energy and power densities of 47.5 w h kg^(-1) and 8 kw kg^(-1),respectively,far exceeding those of previously reported aqueous anion and dual ion storage cells.This research establishes a foundation for the unique anion storage mechanism of the defect engineered perovskite oxides and the advancement of dual ion hybrid energy storage devices with high energy and power densities.

关键词： Anion storage Dual ion storage Defect engineered perovskites Hybrid supercapacitors Nanocomposites

Physicochemical properties and structure of titania-containing metallurgical slags: a review

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Journal of Iron and Steel Research(International) 2022年第2期29卷 187-206页

作者： Zhi-ming Yan Xue-wei Lv Zu-shu Li wmg University of WarwickCoventryCV47ALUK School of Materials Science and Engineering Chongqing UniversityChongqing400044China

The titanium industry can hardly bypass the titania-containing slags,and the slag physicochemical properties are essential in the metallurgical reactor design and process control.The TiO_(2)–FeO-based slags and TiO_(2)–SiO_(2)–CaO-based slags are the main metallurgical slag systems in the titanium resource utilization processes.To elaborate the role of TiO_(2) in the physicochemical properties of titania-containing metallurgical slags,the physicochemical properties including titanium redox ratio,liquidus temperature,viscosity,electrical conductivity,density,surface tension,thermal conductivity,and sulfide capacity were critically reviewed.Moreover,the property prediction models were briefly introduced with regards to the limitations of the existing models.The property prediction models are still required to evolve since not all properties of titania-containing slags can be well modeled.As the slag structure has an intimate relationship with slag properties,the structural details of the titania-containing slag were investigated by using a combination of spectroscopic technologies,but the knowledge of the slag structure was not fully ascertained.The potential research fields related to the physicochemical properties and structure of the titania-containing slags were also suggested.

关键词： Titania-containing slag Physicochemical property Prediction model Slag structure

Data-Based Interpretable Modeling for Property Forecasting and Sensitivity Analysis of Li-ion Battery Electrode

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Automotive Innovation 2022年第2期5卷 121-133页

作者： Kailong Liu Qiao Peng Kang Li Tao Chen wmg The University of WarwickCoventryUK Queen’s University Belfast BelfastUK School of Electronic and Electric Engineering University of LeedsLeedsUK School of Electrical Engineering Southeast UniversityNanjingChina

Lithium-ion batteries have become one of the most promising technologies for speeding up clean automotive applications,where electrode plays a pivotal role in determining battery performance.Due to the strongly-coupled and highly complex processes to produce battery electrode,it is imperative to develop an effective solution that can predict the properties of battery electrode and perform reliable sensitivity analysis on the key features and parameters during the production process.This paper proposes a novel tree boosting model-based framework to analyze and predict how the battery electrode properties vary with respect to parameters during the early production stage.Three data-based interpretable models including AdaBoost,LPBoost,and TotalBoost are presented and compared.Four key parameters including three slurry feature variables and one coating process parameter are analyzed to quantify their effects on both mass loading and porosity of battery electrode.The results demonstrate that the proposed tree model-based framework is capable of providing efficient quantitative analysis on the importance and correlation of the related parameters and producing satisfying early-stage prediction of battery electrode properties.These can benefit a deep understanding of battery electrodes and facilitate to optimizing battery electrode design for automotive applications.

关键词： Li-ion batteries Battery electrode Battery modeling Data analysis

Stochastic speed prediction for connected vehicles using improved bayesian networks with back propagation

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Science China(Technological Sciences) 2022年第7期65卷 1524-1536页

作者： WANG LiHua CUI YaHui ZHANG FengQi COSKUN Serdar LIU KaiLong LI GuangLei School of Mechanical and Precision Instrument Engineering Xi'an University of TechnologyXi'an 710048China Department of Mechanical Engineering Tarsus UniversityTarsusMersin 33400Turkey wmg University of WarwickCoventryCV47ALUK

Advanced vehicular control technologies rely on accurate speed prediction to make ecological and safe decisions. This paper proposes a novel stochastic speed prediction method for connected vehicles by incorporating a Bayesian network(BN) and a Back Propagation(BP) neural network. A BN model is first designed for predicting the stochastic vehicular speed in a priori. To improve the accuracy of the BN-based speed prediction, a BP-based predicted speed error compensation module is constructed by formulating a mapping between the predicted speed and its corresponding prediction error. In the end, a filtering algorithm is developed to smoothen the compensated stochastic vehicular speed. To validate the workings of the proposed approaches in experiments, two typical scenarios are considered: one predecessor vehicle in a double-vehicle scenario and two predecessor vehicles in a multi-vehicle scenario. Simulation results under the considered scenarios demonstrate that the proposed BN-BP fusion method outperforms the BN-based method with respect to the root mean square error, standardized residuals, and R-squared, and the online prediction time of proposed fusion prediction can satisfy a real-time application requirement. The main highlighted contributions of this article are threefold:(1) We put forward an improved BN method, which is combined with a BP neural network, to construct a stochastic vehicular speed prediction method under connected driving;(2) different from existing methods, a unique interconnected framework that consists of a stochastic vehicular speed prediction module, a compensation module, and a speed smoothing module is proposed;(3) extensive simulation studies based on a set of evaluation metrics are illustrated to reveal the advantages and merits of the proposed approaches.

关键词： connected vehicles stochastic vehicular speed prediction Bayesian network back-propagation

Blast furnace ironmaking process with super high TiO_(2) in the slag:Density and surface tension of the slag

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International Journal of Minerals,Metallurgy and Materials 2022年第6期29卷 1170-1178页

作者： Zhengde Pang Yuyang Jiang Jiawei Ling Xuewei Lü Zhiming Yan Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials Chongqing UniversityChongqing 400044China College of Materials Science and Engineering Chongqing UniversityChongqing 400044China wmg University of WarwickCoventryCV47ALUK

Aiming at the process of smelting ultra-high(>80%)or even full vanadium titanomagnetite in blast furnace,we are conducting a series of works on physics character of high TiO_(2) bearing blast furnace slag(BFS)for slag optimization.This work discussed the density and surface tension of high TiO_(2) bearing BFS using the Archimedean principle and the maximum bubble pressure method,respectively.The influence of TiO_(2) content and the MgO/CaO mass ratio on the density and surface tension of CaO-SiO_(2)-TiO_(2)-MgO-Al_(2)O_(3)slags were investigated Results indicated that the density of slags decreased with the TiO_(2) content increasing from 20wt%to 30wt%,but it increased slightly with the MgO/CaO mass ratio increasing from 0.32 to 0.73.In view of silicate network structure,the density and the degree of polymerization(DOP)of network structure have a consistent trend.The addition of TiO_(2) reduced(Q^(3))^(2)/(Q^(2)) ratio(Q^(2) and Q^(3) represent structural unit with bridge oxygen number of 2 and 3,respectively)and then decreased DOP,which led to the decrease of slag density.The surface tension of CaO-SiO_(2)-TiO_(2)-MgO-Al_(2)O_(3) slags decreased dramatically with the TiO_(2) content increasing from 20wt%to 30wt%.Conversely,it increased with the MgO/CaO mass ratio increasing from 0.32 to 0.73.Furthermore,the iso-surface tension lines were obtained under 1723 K using the Tanaka developed model in view of Butler formula.It may be useful for slag optimization of ultra-high proportion(>80%)or even full vanadium titanomagnetite under BF smelting.

关键词： vanadium titanomagnetite density surface tension iso-surface tension lines

Effect of Ca and Ti contents on characteristics of inclusions in Fe-Si-Cr-Mn-Al-Ti-Ca-O melts

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Journal of Iron and Steel Research(International) 2023年第10期30卷 1952-1962页

作者： Ren-sheng Li Meng-chuan Li Tong-sheng Zhang Wan-lin Wang School of Metallurgy and Environment Central South UniversityChangsha 410083HunanChina International Union Research Center for Clean Metallurgy Central South UniversityChangsha 410083HunanChina wmg University of WarwickCoventry CV47ALUK

The inclusion characteristics in 55SiCr spring steel with different contents of titanium and calcium were investigated.The chemical compositions of steel samples were detected by inductively coupled plasma optical emission spectrometer,and the inclusion characteristics was determined by field emission scanning electron microscopy(FE-SEM)and energy-dispersive spectroscopy.The results show that the Ti/Al ratio should be kept at less than 1,and the content of calcium should be controlled between 0.0015 and 0.0025 wt.%in Si-Mn-Al deoxidized steel,so that more solid inclusions can be converted to liquid inclusions.Moreover,the high Ti content in melts is the direct cause of the high proportion of Ti_(3)O_(5) in the inclusions,which involves[Ti]to reduce SiO_(2) and A1_(2)O_(3) in inclusions.In addition,calcium treatment can reduce the content of Ti_(3)O_(5) in inclusions,and the degree of reduction is closely related to the content of[O].The thermodynamic calculation of Fe-Si-Mn-Cr-Al-Ti-Ca-O molten steel system during solidification process was performed by FactSage software,taking all types of inclusions into account,such as titanium oxide,calcium oxide,aluminum oxide,silicon oxide,manganese oxide,calcium titanate,mullite,calcium aluminate,and liquid inclusion.The inclusion type of calculation results was in accordance with the experimental results at 1550℃,and TiO_(x) aggregation behavior was consistent with the Ti_(2)O_(3)-containing precipitation phase.

关键词： Spring steel Inclusion Titanium treatment Calcium treatment Thermodynamic calculation

Nucleation and growth control for iron-and phosphorus-rich phases from a modified steelmaking waste slag

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International Journal of Minerals,Metallurgy and Materials 2023年第2期30卷 378-387页

作者： Juncheng Li Guoxuan Li Feng Qiu Rong Wang Jinshan Liang Yi Zhong Dong Guan Jingwei Li Seetharaman Sridhar Zushu Li School of Material Science and Engineering Jiangsu UniversityZhenjiang 212013China School of Materials Science and Engineering Hefei University of TechnologyHefei 230009China Engineering of Matter Transport and EnergyArizona State UniversityTempeAZ 85287USA wmg the University of WarwickCoventryCV47ALUK

Recovering the iron(Fe)and phosphorus(P)contained in steelmaking slags not only reduces the environmental burden caused by the accumulated slag,but also is the way to develop a circular economy and achieve sustainable development in the steel industry.We had pre-viously found the possibility of recovering Fe and P resources,i.e.,magnetite(Fe_(3)O_(4)) and calcium phosphate(Ca_(10)P_(6)O_(25)),contained in steel-making slags by adjusting oxygen partial pressure and adding modifier B_(2)O_(3).As a fundamental study for efficiently recovering Fe and P from steelmaking slag,in this study,the crystallization behavior of the CaO-SiO_(2)-FeO-P_(2)O_(5)-B_(2)O_(3) melt has been observed in situ,using a confocal scanning laser microscope(CLSM).The kinetics of nucleation and growth of Fe-and P-rich phases have been calculated using a classical crys-tallization kinetic theory.During cooling,a Fe_(3)O_(4) phase with faceted morphology was observed as the 1st precipitated phase in the isothermal interval of 1300-1150℃,while Ca_(10)P_(6)O_(25),with rod-shaped morphology,was found to be the 2nd phase to precipitate in the interval of 1150-1000℃.The crystallization abilities of Fe_(3)O_(4) and Ca_(10)P_(6)O_(25) phases in the CaO-SiO_(2)-FeO-P_(2)O_(5)-B_(2)O_(3) melt were quantified with the in-dex of(T_(U)−T_(I))/T_(I)(where T_(I) represents the peak temperature of the nucleation rate and TU stands for that of growth rate),and the crystalliza-tion ability of Fe_(3)O_(4) was found to be larger than that of Ca_(10)P_(6)O_(25) phase.The range of crystallization temperature for Fe_(3)O_(4) and Ca_(10)P_(6)O_(25) phases was optimized subsequently.The Fe_(3)O_(4) and Ca_(10)P_(6)O_(25) phases are the potential sources for ferrous feedstock and phosphate fertilizer,respectively.

关键词： steelmaking slag magnetite calcium phosphate nucleation growth kinetics

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新能源汽车生产制造企业供应链融资模式研究

投资与合作 2023年第6期 31-33页

作者：李知远华威大学wmg学院

我国科技发展使汽车行业迅猛发展，传统的燃油汽车对空气造成了严重的污染，因此许多汽车生产制造商将重点转向新能源汽车的研发。新能源汽车行业的发展需要金融的支持，特别是供应链上的小型企业，利用供应链融资模式能够有效解决企业... 详细信息

我国科技发展使汽车行业迅猛发展，传统的燃油汽车对空气造成了严重的污染，因此许多汽车生产制造商将重点转向新能源汽车的研发。新能源汽车行业的发展需要金融的支持，特别是供应链上的小型企业，利用供应链融资模式能够有效解决企业融资难的问题。因此，文章对新能源汽车生产制造企业供应链融资模式进行详细分析，提出有效的融资建议。

关键词：新能源汽车供应链融资模式汽车生产制造商

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AZ41镁合金超塑性成形特性

Transactions of Nonferrous Metals Society of China 2021年第3期31卷 648-654页

作者： S.TAYLOR G.D.WEST E.MOGIRE F.TANG H.R.KOTADIA wmg the University of WarwickCoventry CV47ALUK Buehler WMG Materials Engineering Centrethe University of WarwickCoventry CV47ALUK

研究AZ41镁合金在热轧(无后续热变形)条件下的显微组织变化,以确定其在超塑性成形工艺中的适用性,并确定最佳成形参数。采用高温拉伸试验和热气体胀形试验对材料在不同应变速率(1×10^(−1)~1×10^(−3) s^(−1))和温度(350~450℃)下的成... 详细信息

研究AZ41镁合金在热轧(无后续热变形)条件下的显微组织变化,以确定其在超塑性成形工艺中的适用性,并确定最佳成形参数。采用高温拉伸试验和热气体胀形试验对材料在不同应变速率(1×10^(−1)~1×10^(−3) s^(−1))和温度(350~450℃)下的成形性进行评估。利用GOM Aramis相机进行圆形网格分析,了解峰值应变和材料减薄与工业成形过程的关系。通过成形后EBSD和STEM分析材料成形性的机制,发现存在明显动态再结晶。最佳成形参数为450℃和1×10^(−3) s^(−1),此时的峰值伸长率达520%。在1×10^(−2) s^(−1)下,450℃和400℃时的工业相关伸长率分别为195%和170%。

关键词：镁超塑性成形超塑性电子背散射衍射(EBSD) AZ41镁合金