A5101826357- Advancements in Battery Materials
- Advanced Battery Materials and Technologies
- Advanced Battery Technologies Research
- Supercapacitor Materials and Fabrication
- Transition Metal Oxide Nanomaterials
- Advanced battery technologies research
- ZnO doping and properties
- Metal-Organic Frameworks: Synthesis and Applications
- Advanced NMR Techniques and Applications
- Gas Sensing Nanomaterials and Sensors
- Ga2O3 and related materials
- Semiconductor materials and devices
- Analytical Chemistry and Sensors
- Catalysis and Oxidation Reactions
- Nanowire Synthesis and Applications
- Advanced Mathematical Modeling in Engineering
- NMR spectroscopy and applications
- Quantum Dots Synthesis And Properties
- Catalytic Processes in Materials Science
- Geological and Geophysical Studies
- Extraction and Separation Processes
- Acoustic Wave Resonator Technologies
- Gyrotron and Vacuum Electronics Research
- Induction Heating and Inverter Technology
- Electromagnetic Simulation and Numerical Methods
Shanghai Jiao Tong University
2021-2023
East China Normal University
1993-2022
Chinese Academy of Sciences
2002-2021
Applied Precision (Slovakia)
2019-2020
University of Nottingham
2006
University of Neuchâtel
1988-1989
Monovalent Li-substitution has been proven to be an effective strategy resolve the pivotal problems confronted with P2-type layered Mn oxides, such as cooperative Jahn–Teller distortions of Mn3+ ions and drastic P2-(OP4)-O2 phase transformations occurring during desodiation. However, cycling stability most Li+-substituted P2-NaxLiyMn1–yO2 remains far from satisfactory. We herein develop a facile Ti-substitution method improve cyclability by taking Na0.72Li0.24Mn0.76O2 (NLMO) example. As...
Sodium-ion batteries (SIBs) show great application prospects in large-scale energy storage. P2-type manganese-based layered oxides have received special attention by virtue of their high theoretical capacity, low cost, and environmental friendliness. However, water sensitivity limited cycling stability hinder application, especially since the underlying mechanisms for above two issues are still unclear. In this work, copper substitution is used to suppress Jahn–Teller effect Mn3+ affect...
The cation-disordered rock-salt Li<sub>1.2</sub>Ti<sub>0.4</sub>Mn<sub>0.4</sub>O<sub>2</sub> is studied by solid-state NMR and electron paramagnetic resonance (EPR) spectroscopy during the first cycle. anionic redox structural degradation mechanism are discussed.
Na-ion cathode materials cycling at high voltages with long life and capacity are of imminent need for developing future high-energy batteries. However, the irreversible anionic redox activity layered results in structural distortion poor retention upon cycling. Herein, we develop a facile doping strategy by incorporating copper into material lattice to relieve oxygen oxidation voltages. On basis comprehensive comparison Cu-free material, both over-oxidation O2- trapped molecular O2...
Na-ion layered oxides with Na-O-A' local configurations (A' represents nonredox active cations such as Li+, Na+, Mg2+, Zn2+) are attractive cathode choices for energy-dense batteries owing to the accumulation of cationic and anionic redox activities. However, migration A' would degrade stability configuration, bringing about drastic capacity decay structural distortions upon cycling. Herein, we uncover close interplay between irreversible Zn inactivation lattice oxygen (LOR) based on Na-O-Zn...
The layered Mn-based oxides (NaxMnO2), which is one of the most promising cathode families for rechargeable sodium-ion batteries, have received considerable attention because their tunable electrochemical performances and low costs. Herein, a novel P2/O3 intergrown Li-containing Na0.8Li0.27Mn0.68Ti0.05O2 material prepared by Ti-substitution into Mn-site reported. Benefiting from synergistic effects biphasic composite structure inactive d0 element substitution, this electrode exhibits high...
NaCrO2 is a potential cathode material for sodium-ion batteries due to its low cost, safety, and high power. It necessary further understand electronic property during cycling in advance of practical application. In this work, operando EPR carried out monitor the evolution structure cycled between 2.2–3.6 V 2.2–4.5 V. We discover that delocalization takes place at early stage charge, which may account excellent rate performance. addition, via imaging, an signal associated with irreversible...
The preservation of Li TM ( i.e. , Na–O–Li configurations) determines the cyclability oxygen redox rather than stability superstructure.
Nanostructured Na<sub>3</sub>V<sub>2</sub>(PO<sub>4</sub>)<sub>2</sub>O<sub>1.6</sub>F<sub>1.4</sub> fabricated <italic>via</italic> a rapid microwave-assisted solvothermal procedure exhibits impressive power performance, the V<sup>3+</sup>/V<sup>4+</sup> and V<sup>4+</sup>/V<sup>5+</sup> couples are active during electrochemical process.
Our previous work suggested that more carboxylate groups might lead to higher energy density for metal–organic frameworks. In this study, we synthesized a layered framework (MOF) Ni-BHC by use of 1,2,3,4,5,6-benzenehexacarboxylic acid. After evacuation thermal treatment, MOF was employed as an anode lithium storage. For its rich lithiation sites well fast-kinetics structure, it delivers superior reversible capacity 1261.3 mA h g–1 at 100 g–1, far exceeding the performance previously reported...
Herein, the structure–electrochemistry relationship of O2-Li5/6(Li0.2Ni0.2Mn0.6)O2 is deliberately studied by local-structure probes including site-sensitive 7Li pj-MATPASS NMR, quantitative 6Li magic-angle spinning and electron paramagnetic resonance (EPR). The extraction reinsertion LiTM (Li in transition metal layer) during first cycle are only partially reversible, bringing about formation tetrahedral LiLi Li that can be reversibly (de)intercalated after activation cycle. high-voltage...
Triggering reversible lattice oxygen redox (LOR) in oxide cathodes is a paradigmatic approach to overcome the capacity ceiling determined by orthodox transition-metal (TM) redox. However, LOR reactions P2-structured Na-layered oxides are commonly accompanied irreversible nonlattice (non-LOR) and large local structural rearrangements, bringing about capacity/voltage fading constantly evolving charge/discharge voltage curves. Herein, novel Na0.615 Mg0.154 Ti0.154 Mn0.615 ◻0.077 O2 (◻ = TM...
The migration of transition-metal ions and oxygen vacancies in the Li<sub>1.2</sub>Mn<sub>0.6</sub>Ni<sub>0.2</sub>O<sub>2</sub> cathode is mitigated after K<sup>+</sup> bulk doping.
Lattice oxygen redox (LOR) has been explored in transition-metal oxides with a variety of topological structures. However, clear-cut correlation between structures and the behavior LOR not yet definitively established. Here, we discover close interplay Mg displacement stability during long-term battery operation for two closely related model materials, i.e., P2- P3-Na2/3Mg1/3Mn(IV)2/3O2 (NMMO). The substantially distinct P3-NMMO is shown to stem from different evolution mechanisms P-type...
LiCoO2 has been labelled with 17O from 17O-enriched water, and then examined via7Li, 59Co solid-state NMR at different charge states. The results reveal the atomic-level environment evolution during phase transitions, is found to be more sensitive subtle structural changes.
Dual-mode electron paramagnetic resonance (EPR) spectroscopy was employed to analyze redox mechanisms in lithium cobalt oxide LiCoO2 (LCO) cathode material during delithiation and lithiation. It found that the O3-II could not fully convert back pristine O3–I phase while oxygen vacancies quickly generate accumulate cycling. Our study paves way for better understanding doping effects of different elements on future.
Because of the capacity limitation in traditional transition-metal oxide cathodes, design novel cathodes is vital for performance enhancement lithium-ion batteries. In this work, we propose a new anion-intercalation strategy metal–organic frameworks that can be used as high-voltage A pcu-topology [Zn4O2(DAnT)3(DMF)4]·(DMF)6 MOF synthesized with enriched nitrogen active sites and porous cage structure. When applied cathode LiPF6 based electrolyte, reaches theoretical ∼60 mAh g–1 at current...