Metal-to-metal charge transfer for stabilizing high-voltage redox …
2025年2月19日 · The instability of high-voltage redox in LRO is further identified through x-ray diffraction (XRD) analysis at various charged states (pristine, 4.15 and 4.6 V) and the discharged state (2.0 V) .
Structural insights into lithium-deficient type Li-rich layered oxide ...
2023年5月1日 · The X-ray diffraction (XRD) refinement patterns of LRO-100, LRO-95, LRO-90, and LRO-85 are shown in Fig. S1. Meanwhile, lattice parameters obtained from XRD refinement results are listed in Table S1. The electrochemical performance of the LROs materials is largely dependent on their structural characteristics.
Origin of structural degradation in Li-rich layered oxide cathode
2022年6月8日 · The obvious lattice parameter changes can be observed from ex situ XRD pattern, particularly in the 2 theta range of 3.0–6.0°.
Integrated design of aluminum-enriched high-entropy ... - Science
2024年12月4日 · The x-ray diffraction (XRD) and scanning electron microscopy (SEM) characterizations of the initial composition, Al 25 Hf 25 Nb 25 Ti 25 in the as-cast condition, show the single–B2-phase formation (Fig. 3, A and B). This alloy exhibits high strength, with a compressive σ YS ~ 1.7 GPa, but lower ε f ~ 2% .
Improving the oxygen redox reversibility of Li-rich battery cathode ...
2022年3月2日 · In situ XRD of the pristine Li 1.2 Mn 0.6 Ni 0.2 O 2 (a) and Li 1.2 Mn 0.6 Ni 0.2 O 2-δ (M-LRO) samples (b) in the first cycle. The left patterns are 2D contours, and the asterisk label...
刘向峰教授Nature Commun.:基于库仑排斥相互作用提高富锂正极 …
（a，b）原始Li1.2Mn0.6Ni0.2O2和Li1.2Mn0.6Ni0.2O2-δ（M-LRO）的 原位XRD。 图4：富锂层状氧化物正极材料的电子结构；（a，b）原始和M-LRO样品在不同充放电状态下的非原位Mn-edge XAS；（c，d）原始和M-LRO样品在第1、10和50次循环后记录的非原位Mn-edge XAS。 图5：原始和M-LRO样品的气体释放检测。 图6：O2形成的非原位RIXS证据。 （a，b）在不同充放电状态下，激发能为531eV时的原始样品和充电到4.8V时的O k-edge RIXS图谱；（c，d）M-LRO样 …
【原位XRD】Nature子刊：如何表征富锂正极氧的氧化还原可逆 …
2022年4月29日 · 基于国内外顶级科研单位和仪器公司的商业资源，以及数千名科技顾问，为全球科研人员提供包括同步辐射（xas、xrd、saxs，高能+中低能）、球差电镜、fib-tem；原位红外、原位xps、原位xrd、原位raman等在内的各种仪器测试、数据解析和计算模拟服务。
Phase Transformation of Lithium-rich Oxide ... - Wiley Online Library
2019年8月12日 · X-ray diffraction (XRD) patterns of LRO recovered from cycled full cells are presented in Figure 6. The diffraction peaks are indexed to an α-NaFeO 2 hexagonal-type (group symmetry) crystal structure, except for the weak peaks between 2θ = 20~25°.
The role of grain boundaries in suppressing particle fracture in Li ...
2025年4月1日 · Polycrystallinity and small particles improve fracture resistance in Li-rich oxides. Grain boundaries as barriers to intragrain cracks in Li-rich cathode materials. Size reduction improves Li 2 RuO 3 capacity retention from 67 % to 95 % after 50 cycles. Li-rich layered oxides provide high capacities and relatively high voltages.
Enhancing cycling stability in Li-rich layered oxides by atomic layer ...
2024年12月1日 · Li-rich Mn-based layered oxide (LRO) materials, characterized by the formula xLi 2 MnO 3 · (1-x)LiMO 2 (0 < x < 1, M = Ni, Co, and Mn), have garnered significant attention in both the academia and industry owing to their exceptional high capacity, high working voltage, and remarkable cost-effectiveness [[1], [2], [3], [4], [5]].