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| 1 | A preliminary study of level 1A data processing of a low-low satellite to satellite tracking mission显示文摘With the Gravity Recovery and Climate Experiment(GRACE)mission as the prime example,an overview is given on the management and processing of Level 1A data of a low-low satellite to satellite tracking mission.To illustrate the underlying principle and algorithm,a detailed study is made on the K-band ranging(KBR)assembly,which includes the measurement principles,modeling of noises,the generation of Level 1A data from that of Level0 as well as Level 1A to Level 1B data processing. | Xu Peng Qiang Li'e Bian Xing Dong Peng Ju Peng Gao Wei Gong Xuefei Luo Ziren Shao Mingxue Tang Werilin Wan Xiaoyun Lau Yun-Kau | 2015 | Geodesy and Geodynamics2015，6，5： | 2 |
| 2 | Block copolymer electrolyte with adjustable functional units for solid polymer lithium metal battery显示文摘Solid polymer electrolytes have been considered as the promising candidates to improve the safety and stability of high-energy lithium metal batteries.However,the practical applications of solid polymer electrolytes are still limited by the low ionic conductivity,poor interfacial contact with electrodes,narrow electrochemical window and weak mechanical strength.Here,a series of novel block copolymer electrolytes with three-dimensional networks are designed by cross-linked copolymerization of the polyethylene glycol soft segments and hexamethylene diisocyanate trimer hard segments.Their ionic migration performances and interface compatibilities with Li metal anode have been optimized delicately by tailoring the ratio of these functional units.The optimized block copolymer electrolyte has shown an amorphous crystalline structure,a high ionic conductivity of ~5.7×10^(-4)S cm^(-1),high lithium ion transference number(~0.49),wide electrochemical window up to ~4.65 V(vs.Li+/Li) and favorable mechanical strength at 55℃.Furthermore,the enhanced interface compatibility can well support the normal operations of lithium metal batteries using both LiFePO4 and LiNi0.8Co0.15Al0.05O2 cathodes.This study not only paves a new way to develop solid polymer electrolyte with optimizing functional units,but also provides a polymer electrolyte design strategy for the application demand of lithium metal battery. | Zhiyuan Lin Xianwei Guo Yubo Yang Mingxue Tang Qi Wei Haijun Yu | 2021 | Journal of Energy Chemistry2021，30，1： | 1 |
| 3 | Sodium-Ion Battery Anode Construction with SnP_(x)Crystal Domain in Amorphous Phosphorus Matrix显示文摘The high-capacity phosphorus-(P-)based anode materials for sodium-ion batteries(NIBs)often face poor performance retentions owing to the low conductivity and large volume expansion.It is thus essential to buffer these problems by appropriately alloying with other elements such as tin(Sn)and constructing well-designed microstructures.Herein,a series of P-/Sn-based composites have been synthesized by the facile and low-cost one-step ball milling.Pair distribution function(PDF)has been employed as a hardcore quantitative technique to elucidate their structures combined with other techniques,suggesting the formation and ratios of Sn4P3 and Sn crystalline domains embedded inside an amorphous P/carbon matrix.The composite with the largest amount of Sn4P3 in the P/C matrix can deliver the most balanced electrochemical performance,with a capacity of 422.3 mA-h g^(−1 )for 300 cycles at a current density of 1000mAg^(−1).The reaction mechanism has been elucidated by 23Na and 31P solid-state nuclear magnetic resonance(NMR)investigations.The study sheds light on the rational design and concrete identification of P-/Sn-based amorphous-dominant composite materials for NIBs. | Baixu Chen Yubo Yang Aibing Chen Xu Zhang Jaffer Saddique Mingxue Tang Haijun Yu | 2021 | Energy Material Advances2021，，1： | 1 |
| 4 | Yolk-shell nanoarchitecture for stabilizing a Ce_(2)S_(3)anode显示文摘Rare-earth sulfides are of research interest for lithium-ion batteries(LIBs)due to their abundant lithium intercalation sites and low redox voltage.However,their electrochemical performances are not satisfactory because of poor conductivity and volume change upon electrochemical cycling.Herein,nanoarchitectures ofγ-Ce_(2)S_(3)encapsulated in a hollow mesoporous carbon nanosphere(Ce_(2)S_(3)@HMCS)are fabricated using the self-template strategy combined with the in-sphere sulfuration method and tested as an LIB anode.The void space between the Ce_(2)S_(3)core and the outer layer of the carbon nanosphere has been properly designed and modulated to achieve excellent electrochemical performance in terms of electronic conductivity,reversibility,and rate capability.The reversible capacity of Ce_(2)S_(3)@HMCS is 2.6 times that of the pure Ce_(2)S_(3)anode,which can gradually increase and maintain a capacity of 282 mAh·g^(−1)at a current density of 1 A·g^(-1),and a high Coulombic efficiency(~100%)can be achieved even after 1000 cycles.This good performance is attributed to the unique yolk-shell nanostructure with a highly crystallized and stable Ce3S2 core and volume expansion buffer space upon lithiation/delithiation.Ex situ X-ray diffraction and nuclear magnetic resonance results indicate that the lithiation of Ce_(2)S_(3)@HMCS is an intercalation process.This study represents an important advancement in precise structural design with in-sphere sulfuration and sheds light on a potential direction for highperformance lithium storage. | Kanglong Hui Jipeng Fu Jie Liu Yongjin Chen Xiang Gao Tian Gao Qi Wei Chengyu Li Hongjie Zhang Mingxue Tang | 2021 | Carbon Energy2021，3，5： | 0 |
| 5 | Hybrid coating SnO_(2)for enhanced Li ions storage显示文摘Anode SnO_(2)in lithium-ion batteries suffers from volume expansion and agglomeration.Here,the SnO_(2)nanoparticles are hybrided with ZrO_(2)particles by the support of carbon nanotube networks.The obtained SnO_(2)/C/ZrO_(2)composite shows improved electrochemical performances.Investigations reveal that the carbon nanotubes shorten the transmission path of electrons and Li^(+) ions.Ball milling with ZrO_(2)promotes the formation of nanosized SnO_(2)to weaken the internal strain change,being beneficial to buffering volume change during electrochemical cycling afterwards.High-resolution 6.7Li NMR investigations indicate that conversion and alloying reactions are stepwise involved for SnO_(2)/C/ZrO_(2)anode.The strategy of designing SnO_(2)/C/ZrO_(2)composite from the morphology-controlled metal-organic frameworks for energy storage widens the possibility to fabricate promising materials with enhanced performances. | Yanan Gao Jie Liu Chenjie Lou Hailiang Geng Jipeng Fu Chengyu Li Yongjin Chen Cong Wang Wenda Zhang Xiaojun Kuang Yifan Liu Xiang Gao Mingxue Tang | 2023 | Chinese Chemical Letters2023，34，12： | 0 |
| 6 | Real-time monitoring of the lithiation process in organic electrode 7,7,8,8-tetracyanoquinodimethane by in situ EPR显示文摘Organic electrodes are advantageous for rechargeable lithium-ion batteries owing to their high theoretical capacities, diverse functionalities, and environmental compatibility. Understanding the working mechanism of organic electrodes is vital to strategic materials design. However, due to lack of suitable characterization tools, it has been challenging to probe the reaction processes of organic electrodes in real-time. Here, non-destructive in situ electron paramagnetic resonance(EPR) was performed on a model organic electrode, 7,7,8,8-tetracyanoquinodimethane(TCNQ) used in rechargeable lithium-ion batteries,to directly follow the redox reactions in real-time. In order to minimize interfering signals from other parts of the batteries than the TCNQ electrode of interest, two sets of batteries are fabricated and studied with in situ EPR:(1) a Li CoO_(2)//Li_(4)Ti_5O_(12) full-cell battery to determine the EPR signal evolution of additives and electrolytes;(2) a Li CoO_(2)//TCNQ battery, and the difference in the observed EPR signals reflects purely the redox reactions of TCNQ upon lithiation and delithiation. A two-electron reversible redox reaction is delineated for TCNQ. TCNQ dimers form during the first electron injection upon lithiation and followed by the break-down of the dimers and associated electron coupling to produce massive delocalized electrons, resulting in increased EPR signal during the 2 nd electron injection. Reversible trends are observed during electron ejection upon delithiation. In situ EPR is very sensitive to electron activities,thus is a powerful tool to follow redox reactions of organic electrodes, allowing for improved fundamental understanding of how organic electrodes work and for informed design of high-performance organic materials for energy storage. | Mingxue Tang Nhat N.Bui Jin Zheng Likai Song Yan-Yan Hu | 2021 | Journal of Energy Chemistry2021，30，9： | 0 |
| 7 | Multiple transition metals modulated hierarchical networks for high performance of metal-ion batteries显示文摘Searching anodes with excellent electrochemical performance has been in great demand for rechargeable metal ion batteries. In this contribution, Fe/Co co-doped Ni S with N-based carbon(Fe Co-NiS@NC) derived from trimetallic Prussian blue analogue is designed and synthesized. The composition can be easily adjusted and modulated by multi-metals. In addition, the well-designed carbon nanocubes effectively promote electronic conductivity and buffer the volume change upon charge and discharge cycling, resulting in good capacity and long-term cycle life for both lithium-ion batteries and sodium-ion batteries, with capacities of 1018 m Ah g^(-1)(vs. Li/Li^(+)) and 454 m Ah g^(-1)(vs. Na/Na^(+)), respectively, after 100 cycles.Kinetics studies indicate that the electrochemical behaviors are manipulated by both diffusion and pseudocapacitance processes. These strategies would open new opportunities and potention for novel energy storage. | Jie Liu Chenjie Lou Jipeng Fu Xuan Sun Jingrong Hou Jiwei Ma Yongjin Chen Xiang Gao Ligang Xu Qi Wei Mingxue Tang | 2022 | Journal of Energy Chemistry2022，31，7： | 0 |
| 8 | Gradient defects mediate negative thermal quenching in phosphors显示文摘Luminescent materials often suffer from thermal quenching(TQ),limiting the continuation of their applications under high temperatures up to 473 K.The formation of defect levels could suppress TQ,but rational synthesis and deep understanding of multiple defects-regulated luminescent materials working in such a wide temperature range still remain challenging.Here,we prepare a negative thermal quenching(NTQ)phosphor LiTaO_(3)∶Tb^(3+)by introducing gradient defects V_(Ta)^(5−),Tb_(Li)^(2+),and(V_(Ta)Tb_(Li))^(3−)as identified by advanced experimental and theoretical studies.Its photoluminescence significantly becomes intense with rising temperatures and then slowly increases at 373 to 473 K.The mechanism studies reveal that gradient defects with varied trapping depths could act as energy buffer layers to effectively capture the carriers.Under thermal disturbance,the stored carriers could successively migrate to the activators in consecutive and wide temperature zones,compensating for TQ to enhance luminescence emission.This study initiates the synthesis of multi-defect NTQ phosphors for temperature-dependent applications. | Mingxue Deng Xingzhong Cao Yangmin Tang Zhenzhen Zhou Lijia Liu Xiaofeng Liu Peng Zhang Lo-Yueh Chang Hao Ruan Xinjun Guo Jiacheng Wang Qian Liu | 2023 | Advanced Photonics2023，5，2： | 0 |
| 9 | Enhancing reversibility of LiNi_(0.5)Mn_(1.5)O_(4)by regulating surface oxygen deficiency显示文摘Oxygen deficiency has crucial effects on the crystal structure and electrochemical performance of spinel oxide lithium electrode materials such as LiNi_(0.5)Mn_(1.5)O_(4)(LNMO)cathode.In particular,the oxygen stoichiometry on the crystal surface differs from that on the crystal interior in LNMO.The detection of local oxygen loss in LNMO and its correlation with the crystal structure and the cycling stability of LNMO remain challenging.In this study,the effect of oxygen deficiency in LNMO controlled by sintering temperature on the surface crystal structure and electrochemical performance of LNMO is comprehensively investigated.The high concentration of oxygen vacancies segregates at the surface regions of LNMO forming a thin rock‐salt and/or deficient spinel surface layer.The atomic‐level surface structure reconstruction was demonstrated by annular dark‐field and annular brightfield techniques.For the synthesis of LNMO,the higher sintering temperature results in higher crystallinity but the higher oxygen deficiency in LNMO.The high crystallinity of LNMO would increase the thermal stability of LNMO cathodes while the high content of oxygen deficiency would decrease the surface structural stability of LNMO.Therefore,the LNMO sintered at a medium temperature of 850°C achieved the best capacity retention.The results suggest a competitive function mechanism between oxygen stoichiometry and the crystallinity of LNMO on the cycling performance of LNMO. | Dandan Wang Cong Gao Xuefeng Zhou Shang Peng Mingxue Tang Yonggang Wang Lujun Huang Wenge Yang Xiang Gao | 2023 | Carbon Energy2023，5，11： | 0 |
| 10 | Dual-enhancement of chromaticity and thermal stability:In-situ synthesis of core-shell γ-Ce_(2)S_(3) @CePO_(4) configuration显示文摘Non-toxic rare earth(RE) composite materials are promising and active in optoelectronic fields,such as pigment.In this work,Na ions doped γ-Ce_(2) S_(3) pigments were synthesized by solid-phase vulcanization and followed by in-situ synthesis to prepare an outer layer of CePO_(4) film.The characterizations of X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray photoelectron spectroscopy(XPS),solid state nuclear magnetic resonance(NMR) indicate that Na-dopedγ-Ce_(2) S_(3) and CePO_(4) uniformly and tightly coated core-shell structure was successfully synthesized.The thermogravimetric analysis(TG) and reflection spectrum(RS) reveal that the CePO_(4) coating significantly improves the colorant and thermal stability performance of γ-Ce_(2) S_(3) .The excellent color quality of γ-Ce_(2) S_(3) @CePO_(4)(L*=45.16,a*=55.94.b*=44.53) is achieved and the red color(L*=43.82,a*=49.79,b*=38.04) is still retained even if the sample is heated in air at 400℃ for 30 min. | Kanglong Hui Wei Dong Jipeng Fu Mingxue Tang Qi Wei Chengyu Li Hongjie Zhang | 2022 | Journal of Rare Earths2022，40，5： | 0 |
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