A5103067997- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Crystallography and molecular interactions
- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Catalytic Processes in Materials Science
- Supercapacitor Materials and Fabrication
- Catalysis and Oxidation Reactions
- Extraction and Separation Processes
- Nanomaterials for catalytic reactions
- Advanced Battery Technologies Research
- Ferroelectric and Piezoelectric Materials
- Ammonia Synthesis and Nitrogen Reduction
- Magnetism in coordination complexes
- Semiconductor materials and devices
- Multiferroics and related materials
- Metal-Organic Frameworks: Synthesis and Applications
- Catalysis and Hydrodesulfurization Studies
- Layered Double Hydroxides Synthesis and Applications
- Dielectric properties of ceramics
- Advanced Photocatalysis Techniques
- Electrocatalysts for Energy Conversion
- Metal complexes synthesis and properties
- Machine Learning in Materials Science
- Catalysts for Methane Reforming
Xi'an Jiaotong University
2022-2024
Sichuan University
2014-2024
Karlsruhe Institute of Technology
2020-2024
Guilin University of Technology
2020-2024
Shandong University
2023
China Aerodynamics Research and Development Center
2022
Chengdu University
2015-2016
Queen's University
2003-2005
Jilin University
2003-2005
State Key Laboratory of Inorganic Synthesis and Preparative Chemistry
2003-2005
The solvothermal reaction of zinc acetate dihydrate with a mixture benzene-1,4-dicarboxylic acid (H(2)BDC) and benzene-1,3,5-tricarboxylic (H(3)BTC) in solution containing N,N'-dimethylformamide (DMF), absolute ethanol, chlorobenzene gave rise to metal-organic polymer, Zn(3).BDC.2BTC.2NH(CH(3))(2).2NH(2)(CH(3))(2). structure this polymer possesses unique three-dimensional framework tri-zinc clusters, BDC BTC units colinking the clusters. Moreover, exhibits strong photoluminescence at room...
Abstract One major challenge in the field of lithium-ion batteries is to understand degradation mechanism high-energy lithium- and manganese-rich layered cathode materials. Although they can deliver 30 % excess capacity compared with today’s commercially- used cathodes, so-called voltage decay has been restricting their practical application. In order unravel nature this phenomenon, we have investigated systematically structural compositional dependence lithium insertion compounds on content...
Ni-rich layered oxides are one of the most attractive cathode materials in high-energy-density lithium-ion batteries, their degradation mechanisms still not completely elucidated. Herein, we report a strong dependence pathways on long-range cationic disordering Co-free Li1-m (Ni0.94 Al0.06 )1+m O2 (NA). Interestingly, disordered phase with lattice mismatch can be easily formed near-surface region NA particles very low cation disorder (NA-LCD, m≤0.06) over electrochemical cycling, while...
Three new 3d−4f heterometallic coordination polymers, [Ln2(H2O)4M2(H2O)2(QA)5]·nH2O (H2QA = quinolinic acid; Ln Gd, M Ni, n 7 (1); Co, 6.5 (2); Dy, (3)), have been synthesized through hydrothermal pretreatment and cooling-down crystallization. These compounds possess the isostructural 3D frameworks with 1D chairlike channels along c axis, which are occupied by noncoordinating water molecules. Crystal data: for 1, C35H41Gd2Ni2N5O33, orthorhombic, space group Pna21, a 28.567(6) Å, b 14.498(3)...
Abstract As promising cathode materials, the lithium‐excess 3d‐transition‐metal layered oxides can deliver much higher capacities (>250 mAh g −1 at 0.1 C) than current commercial oxide materials (≈180 used in lithium ion batteries. Unfortunately, original formation mechanism of these during synthesis is not completely elucidated, that is, how and oxygen inserted into matrix structure precursor lithiation reaction? Here, a practical method, coprecipitation route followed by microwave...
The discovery of Li-containing transition-metal (TM) oxides has attracted broad interest and triggered intensive studies on these as cathodes for lithium-ion batteries over decades. Unfortunately, a clear picture how Li/TM/O ions are transported electrons transferred during the synthesis compounds is still missing, especially when cubic close-packed (ccp) anion sublattices involved, it case spinel, layered, or rock-salt systems. In present study, series layered Li(Ni,Co,Mn)O2 were chosen...
Abstract Deciphering the sophisticated interplay between thermodynamics and kinetics of high‐temperature lithiation reaction is fundamentally significant for designing preparing cathode materials. Here, formation pathway Ni‐rich layered ordered LiNi 0.6 Co 0.2 Mn O 2 (O‐LNCM622O) carefully characterized using in situ synchrotron radiation diffraction. A fast nonequilibrium phase transition from reactants to a metastable disordered Li 1− x (Ni ) 1+ (D‐LNCM622O, 0 < 0.95) takes place while...
Layered alkali-containing 3d transition-metal oxides are of the utmost importance in use electrode materials for advanced energy storage applications such as Li-, Na-, or K-ion batteries. A significant challenge field chemistry is understanding dynamics chemical reactions between alkali-free precursors and alkali species during synthesis these compounds. In this study, situ high-resolution synchrotron-based X-ray diffraction was applied to reveal Li/Na/K-ion insertion-induced structural...
P2-type layered transition-metal (TM) oxides, NaxTMO2, are highly promising as cathode materials for sodium-ion batteries (SIBs) due to their excellent rate capability and affordability. However, NaxTMO2 is afflicted by issues such Na+/vacancy ordering multiple phase transitions during Na-extraction/insertion, leading staircase-like voltage profiles. In this study, we employ a combination of high Na content Li dual-site substitution strategies enhance the structural stability oxide...
Abstract One of the major challenges facing application layered LiNiO 2 (LNO) cathode materials is oxygen release upon electrochemical cycling. Here it shown that tailoring provided lithium content during synthesis process can create a disordered Li 1‐ x Ni 1+ O phase at primary particle surface. The surface, which serves as self‐protective layer to alleviate loss, possesses same rhombohedral structure ( R m ) inner core particles ≈ 0). With advanced synchrotron‐based x‐ray 3D imaging and...
Lithium- and manganese-rich layered oxides (LMLOs, ≥ 250 mAh g-1 ) with polycrystalline morphology always suffer from severe voltage decay upon cycling because of the anisotropic lattice strain oxygen release induced chemo-mechanical breakdown. Herein, a Co-free single-crystalline LMLO, that is, Li[Li0.2 Ni0.2 Mn0.6 ]O2 (LLNMO-SC), is prepared via Li+ /Na+ ion-exchange reaction. In situ synchrotron-based X-ray diffraction (sXRD) results demonstrate relatively small changes in parameters...
We reconfigure the sodiation/desodiation process of P3-type layered cathodes by a local symmetry tuning strategy to enhance their stability. The exhibit long-term cycling stability with higher capacity retention 74% after 2000 cycles at 1C.
Abstract With exceptional capacity during high‐voltage cycling, P3‐type Na‐deficient layered oxide cathodes have captured substantial attention. Nevertheless, they are plagued by severe degradation over cycling. In this study, tuning and optimizing the phase composition in oxides through Li incorporation proposed to enhance stability. The structural dependence of Na 2/3 x Ni 0.25 Mn 0.75 O 2+ δ on lithium content (0.0 ≤ 1.0) offered synthesis is investigated systematically an atomic scale....
A unique metal–organic polymer Mn·PDB·H2O (H2PDB = pyridine-3,4-dicarboxylic acid), with weak antiferromagnetic interactions both between the manganese(II) centers of an infinite Mn–O–C chain and adjacent chains, has been synthesized by hydrothermal reaction Mn(CH3COO)2·4H2O H2PDB; X-ray diffraction shows that possesses a one-dimensional rectangular channel built up from pyridine rings pseudo-layers formed straight building units.
Li-rich or Ni-rich layered oxides are considered ideal cathode materials for high-energy Li-ion batteries (LIBs) owing to their high capacity (> 200 mAh g–1) and low cost. However, both suffering from severe structural instability upon high-voltage cycling 4.5 V). Here, “Li-rich Ni-rich” Li1.08Ni0.9Mn0.1O2 with core-shell architecture designed synthesized improve cyclability. These determined be composed of a less reactive Mn-rich” shell high-capacity core. As Li-ions gradually enter into...