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Cycling performance of layered oxide cathode materials for sodium-ion batteries

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International Journal of Minerals,Metallurgy and Materials 2024年第7期31卷 1720-1744页

作者： Jinpin Wu Junhang Tian Xueyi Sun weidong zhuang School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Beijing Key Laboratory for Green Recovery and Extraction of Rare and Precious Metals University of Science and Technology BeijingBeijing 100083China

Layered oxide is a promising cathode material for sodium-ion batteries because of its high-capacity,high operating voltage,and simple *** performance is an important criterion for evaluating the application prospects of ***,facing challenges,including phase transitions,ambient stability,side reactions,and irreversible anionic oxygen activity,the cycling performance of layered oxide cathode materials still cannot meet the application ***,this review proposes several strategies to address these ***,bulk doping is introduced from three aspects:cationic single doping,anionic single doping,and multi-ion ***,homogeneous surface coating and concentration gradient modification are *** addition,methods such as mixed structure design,particle engineering,high-entropy material construction,and integrated modification are ***,a summary and outlook provide a new horizon for developing and modifying layered oxide cathode materials.

关键词： sodium-ion battery layered oxide materials cycling performance bulking doping surface coating concentration gradient mixed structure high-entropy

Enhanced luminescence performances of Mn^(4+)-activated Sr_(4)Al_(14)O_(25)red phosphors by doping with Sc^(3+)ions

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Journal of Rare Earths 2021年第4期39卷 380-385页

作者： Lin Luo Ronghui Liu Yuanhong Liu weidong zhuang Yanfeng Li Shaowei Qin National Engineering Research Center for Rare Earth Materials GR1NM Group Co.Ltd.Beijing 100088China GRIREM Advanced Materials Co. LtdBeijing 100088China General Research Institute for Nonferrous Metals.Beijing 100088 China

A series of non-rare earth Mn^(4+)-activated strontium aluminate phosphors Sr_(4)Al_(14)O_(25):Mn^(4+)co-doped with Sc^(3+)ions were successfully synthesized by a high-temperature solid-state reaction *** result reveals that there is no introduction of additional phase but expansion of lattice with incorporation of Sc34 *** and emission spectrum measurement shows that the synthesized phosphors can be efficiently excited by near-ultraviolet and blue light,and a deep red emission centered at 652 nm with a narrow full width at half maximum(FWHM)can be obtained,which is attributed to the transition^(2)E→^(4)A_(2)of Mn^(4+)*** addition,the crystal field strength parameter(Dq)and Racah parameters(B,C)and energies of states were calculated based on experimental ***,the luminous intensity of Sr_(4)Al_(14-x)SCxO_(25):Mn^(4+)is enhanced and increased by 60%compared with Mn^(4+)single incorporated sample at x=0.06.A phenomenon of redshift is observed in the excitation spectrum and discussed ***,the mechanism of the positive effects with Sc^(3+)ions incorporated into lattice is discussed in *** the results suggest that the Sr_(4)Al_(13.94)Sc_(0.06)O_(25):Mn^(4+)phosphor will become one of the great candidates for backlight of LCD.

关键词： Red phosphors Backlight Luminescence Mn^(4+) Rare earths

Photoluminescent properties of tunable green-emitting oxynitride （Baa-xSrx）Si6012N2 ：Eu2＋ phosphor and its application in white LEDs

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Journal of Rare Earths 2013年第10期31卷 944-949页

作者： Guantong CHEN weidong zhuang Ronghui LIU Yuanhong LIU Yunsheng HU Huaqiang HE National Engineering Research Center for Rare Earth Materials General Research Institute for Nonferrous Metals Grirem Advanced Materials Co. Ltd. Beijing 100088 China

Green emitting Eu2＋-doped （Ba3_xSrx）Si6012N2 solid solutions were synthesized through solid state reaction at 1350 ℃ for 10 h under a N2/H2 atmosphere. The XRD patterns revealed that the solid solution series of （Ba3 x-ySrx）Si6Ol2N2：yEu2＋ with x value ranging from 0-0.6 were established. An efficient and intense tunable green light was observed by varying the cation Sr/Ba ratio. The emission spectra exhibited an entire shift towards long wavelength with increasing ofx value, which was caused by large crystal field splitting and Stokes shift. The x value dependence of emission intensity was discovered and explained by the enhanced probability of electron from excited 4f state to 5d ground state via nonradioactive transition. Highly thermal stability and feasible color coordinates were verified. White LEDs with excellent photochromic properties were fabricated by packing GaN based blue chips and （Ba Sr）3Si6012N2：Eu2＋ phosphors. All results indicated that the （Ba3_xSrx）SirO12N2：Eu2＋ phosphors were confirmed to be a promising candidate for pc-white LEDs in solid state lighting.

关键词： oxynitride phosphor solid solution white LEDs rare earths

Facile and green route to highly luminescent ZnS-shelled CdSe nanocrystals

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Rare Metals 2009年第2期28卷 107-111页

作者： Ye Xinyua zhuang weidong Hu Yunsheng Luo Xinyu Zhao Chunlei Huang Xiaowei Gen Res Inst NonFerrous Met Natl Engn Res Ctr Rare Earth Mat Beijing 100088 Peoples R China Grirem Adv Mat Co Ltd Beijing 100088 Peoples R China Jiangxi Univ Sci & Technol Sch Mat & Chem Engn Ganzhou 341000 Peoples R China

Highly luminescent CdSe/ZnS nanocrystals were obtained by adapting non-TOP-based synthesis and a subsequent two-phase ZnS shelling procedure:the core CdSe nanocrystals were synthesized in sole solvent paraffin liquid with cadmium oxide,elemental sele-nium,and oleic acid; the deposition of the ZnS shell was conducted by using zinc stearate in toluene and sodium sulfide in deionized water. The green and low-cost route was proved to be more efficient to constrain the size of core nanocrystals while tuning the ...

关键词： crystal structure characterization solvent growth from solution nanomaterials CdSe/ZnS

Synthesis, structure and luminescent properties of yellow phosphor La3Si6N11 ：Ce^3＋ for high power white-LEDs

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Journal of Rare Earths 2017年第11期35卷 1059-1064页

作者： Fu Du weidong zhuang Ronghui Liu Yuanhong Liu Wei Gao Xia Zhang Yuan Xue Hongrui Hao National Engineering Research Center for Rare Earth Materials General Research Institute for Nonferrous Metals Grirem Advanced Materials Co. Ltd.Beijing 100088 China

A series of high phase purity blue light excitable yellow-emitting LaSiN:xCephosphors were synthesized by the high temperature solid state reactions method. The structure and luminescent properties were investigated. The phase structure was studied by means of X-ray diffraction, structures refinements and energy dispersive X-ray spectroscopy. The phosphors effectively excited by the light of450 nm and show intense yellow emission at 535 nm with FWHM of 115 nm corresponding to the5 d →~2 Fand 5 d →~2 Ftransitions of Ce. In addition,the optimized LaSiN:0.14 Ceexhibits a weak thermal quenching, which remains 98.2% of the initial emission intensity when heated to 200 ℃,the thermal quenching properties exhibit a modest decline when the temperature returned to room temperature. The above results indicate that LaSiN:Cecan be regarded as a high promising phosphor for applications in high power white-light LED.

关键词： High phase purity La_3Si_6N_(11):Ce^(3+) Small thermal quenching High power white-light LED

Luminescence modification of Eu^(3+)-activated molybdate phosphor prepared via co-precipitation

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Journal of Rare Earths 2009年第5期27卷 758-760页

作者： ZHAO Chunlei HU Yunsheng zhuang weidong HUANG Xiaowei HE Tao National Engineering Research Center for Rare Earth Materials General Research Institute for Nonferrous Metalsand Grirem Advanced Materials Co.Ltd.Beijing 100088China

Eu-activated CaMoO_(4)phosphors were co-precipitated in an aqueous solution,and NH_(3)·H_(2)O,NH_(4)HCO_(3)and(NH_(2))_(2)CO as pre-cipitating aid agents were compared based on the morphology and particle size distribution of the phosphor ***3+as sensitizer ion was investigated on the luminescence of CaMoO_(4):Eu,and it could strengthen the 406 nm absorption of this *** last,the scheelite CaMoO_(4):Eu and wolframite ZnMoO_(4):Eu were selected to compare their host *** result showed that the scheelite molybdate host exhibited stronger UV absorption than wolframite one.

关键词： CaMoO_(4) ZnMoO_(4) europium samarium red phosphor rare earths

Broadband near-infrared luminescence and energy transfer of Cr^(3+),Ce^(3+) co-doped Ca_(2)LuHf_(2)Al_(3)O_(12) phosphors

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Journal of Rare Earths 2021年第3期39卷 269-276,I0002页

作者： Jinpin Wu weidong zhuang Ronghui Liu Yuanhong Liu Tongyu Gao Chunpei Yan Min Cao Junhang Tian Xiaoxia Chen National Engineering Research Center for Rare Earth Materials GRINM Croup Co.Ltd.Beijing 100088China GRIREM Advanced Materials Co. Ltd.Beijing 100088China General Research Institute for Nonferrous Metals Beijing 100088China Jiangxi Province Key Laboratory of Polymer Micro/Nano Manufacturing and Devices School of ChemistryBiology and Materials ScienceEast China University of TechnologyNanchang 330046China

Broadband near-infrared phosphors are highly desirable for food *** Ca_(2)LuHf_(2)Al_(3)O_(12):Cr^(3+)(CLHA:Cr^(3+)) and Ca_(2)LuHf_(2)Al_(3)O_(12):Ce^(3+),Cr^(3+)(CLHA:Ce^(3+),Cr^(^(3+))) phosphors were synthesized by the conventional high-temperature solid state *** CLHA:Cr^(3+)phosphor,with a good thermal stability,shows a red shift owing to radiation reabsorption and non-radiative transition with increasing Cr^(3+)*** co-doped sample,the emission intensity of Cr^(3+)can be enhanced by three times due to the energy transfer from Ce^(3+)to Cr^(3+),which can be evidenced by a significant overlap between the PLE of Cr^(3+)single-doped phosphor and the PL of Ce^(3+)single-doped *** addition,the mechanism of energy transfer is identified as a quadrupole-quadrupole interaction according to decay Lifetime and Dexter’s energy transfer *** broadband NIR emission peaked at 775 nm of CLHA:Cr^(3+),Ce^(3+)phosphor shows a bright prospect in nondestructive quality-control analysis systems for food.

关键词： Broadband near-infrared Energy transfer Garnet phosphor Rare earths

Blue-emitting Sr_(1-x)Ca_(x)Lu_(2)O_(4):Ce^(3+) phosphors for high CRI white LEDs

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Journal of Rare Earths 2021年第6期39卷 627-633,I0001页

作者： Yipeng Zhou Yunsheng Hu Ronghui Liu Yuanhong Liu weidong zhuang Min Cao Tongyu Gao Junhang Tian Yanfeng Li Guantong Chen National Engineering Research Center for Rare Earth Materials GRINM Group Co.Ltd.Beijing100088China CRIREM Advanced Materials Co. Ltd.Beijing 100088China General Research Institute for Nonferrous Metals Beijing 100088China

A broadband blue-emitting Sr_(1-x)Ca_(x)Lu_(2)O_(4):Ce^(3+)(x=0-0.2) phospho rs were synthesized,which can be used for near-UV pumped white light-emitting diodes(w-LEDs).The crystal structures,photoluminescence pro perties,external quantum efficiency,the rmal stability and application perfo rmance of Sr_(1-x)Ca_(x)Lu_(2)O_(4):Ce^(3+),by partially substituting Sr^(2+) with Ca^(2+)(x=0-0.2),were studied by various analytical *** the Ca/Sr ratio of Sr_(1-x)Ca_(x)Lu_(2)O_(4):Ce^(3+) gradually increases,the emission peak of Sr_(1-x)Ca_(x)Lu_(2)O_(4):Ce^(3+) red-shiftes from 459 to 465 nm,corrected external quantum efficiency increases from 31.8% to 42.9%,and the thermal stability is also *** mechanism of the changes of the photoluminescence emission and excitation spectra,external quantum efficiency and thermal stability properties was also investigated in *** addition,a w-LED was fabricated by using SrLu_(2)O_(4):Ce^(3+)(blue),β-sialon:Eu^(2+)(green) and(Sr,Ca)AlSiN_(3):Eu^(2+)(red) phosphors combined with a 405 nm near-UV LED chip,and its color rendering index(CRI) reaches *** Sr_(0.8)Ca_(0.2)Lu_(2)O_(4):Ce^(3+) is applied as blue phosphor to substitute SrLu_(2)O_(4):Ce^(3+),the obtained w-LED devices have high luminous efficiency,and CRI greater than *** re sults show that the Sr_(1-x)Ca_(x)Lu_(2)O_(4):Ce^(3+) can be potential blue phosphors for n-UV pumped high CRI w-LEDs application.

关键词： n-UV pumped w-LED Blue phosphor Red shift Excellent thermal stability High color rendering index Rare earths

Carbon interstitial defects causing emission red shift in YAG:Ce phosphor:First-principles calculation

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Journal of Rare Earths 2018年第12期36卷 1239-1244页

作者： Yaling Zheng weidong zhuang Xianran Xing Ronghui Liu Yanfeng Li Yuanhong Liu Yunsheng Hu Xiaoxia Chen Lei Chen Xiaole Ma National Engineering Research Center for Rare Earth Materials General Research Institute for Nonferrous Metals and Grirem Advanced Materials Co.Ltd. Department of Physical Chemistry University of Science & Technology Beijing

Y3Al5O12:Ce3+ is the most famous phosphor material due to its excellent photolumincent ***,through first-principles calculation,the effect of carbon interstitial defects on Y3Al5O12:Ce3+phosphor was investigated. It is found that the carbon interstitials tend to occupy the next-nearest sites of Ce3+ion in Y3Al5O12:Ce3+ lattice. Specially,these interstitial defects can shorten the Ce3+-O2-bond length, leading to a larger crystal field splitting of 5 d orbital of the Ce3+atom and bigger 5 d centroid *** two factors cause the emission spectrum of Y3Al5O12(C):Ce3+red shift compared with that of Y3Al5O12:Ce3+. Moreover, with our comparison experiment, we find that the Y3Al5O12(C):Ce3+ has an obvious red shift compared with that of Y3Al5O12:Ce3+system,which is in accord with our first principles calculation. Our work systematically investigates the impact of the carbon interstitial defect on Y3Al5O12:Ce3+,and provides a new route to tune the emission spectrum in Y3Al5O12:Ce3+.

关键词： YAG:Ce Carbon interstitial defects Red shift First-principles calculation Rare earths