Li（Li1/3Mn2/3O2）含量对锂离子电池正极材料xLi(Li1/3Mn2/3O2)-(1-x)LiNi0.975V0.025O2结构和电化学性能的影响

IF 4.6 2区物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Results in Physics Pub Date : 2025-10-12 DOI:10.1016/j.rinp.2025.108482

Belete Tilahun Enyew , Zihan Yan , Jiexi Wang , Paulos Taddesse

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引用次数: 0

摘要

本文研究了一系列富锰和富锂的xLi(Li1/3Mn2/3O2)-(1-x)LiNi0.975V0.025O2（其中x = 0.0, 0.3, 0.4, 0.45, 0.55和0.65）正极材料的结构和电化学性能。这些材料是用两步固相反应合成的。通过x射线衍射（XRD）和傅里叶变换红外光谱（FTIR）证实了合成材料的晶体结构和层状性质。扫描电镜（SEM）分析显示，晶粒尺寸在0.44 ~ 0.56 μm之间。利用能量色散x射线能谱（EDS）和高角环形暗场扫描透射电子显微镜（HAADF-STEM）测图研究了元素的分布。这些分析表明，Ni和V在LiNi0.975V0.025O2 （LNV）样品中均匀分布，Ni、Mn和V在xLi(Li1/3Mn2/3O2)-(1-x)LiNi0.975V0.025O2 （LMNV-x）样品中均匀分布。采用x射线光电子能谱（XPS）研究了样品中各组成元素的氧化态。对结构参数的分析表明，LMNV-x系列中Li（Li1/3Mn2/3O2）含量对结构参数有明显的依赖性。Li（Li / 3mn2 / 3o2）的掺入提高了LMNV材料的电化学性能。LMNV-0.55在2.8 ~ 4.8 V的电压范围内，以0.1C的电流速率循环50次后，放电容量达到198.8 mAh/g，放电容量保持在初始容量的90.4%。此外，LMNV-0.55获得了最高的初始库仑效率（92%），并表现出优异的循环稳定性。电化学阻抗谱（EIS）证实了这些发现，确定LMNV-0.55是合成样品中性能最好的正极材料。电化学研究表明，xLi(Li1/3Mn2/3O2)-(1-x)LiNi0.975V0.025O2材料具有开发高性能锂离子电池的潜力。

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Effect of Li(Li1/3Mn2/3O2) content on structural and electrochemical properties in xLi(Li1/3Mn2/3O2)-(1-x)LiNi0.975V0.025O2 cathode materials for lithium-ion batteries

This study investigated the structural and electrochemical properties of a series of manganese- and lithium-rich xLi(Li_1/3Mn_2/3O₂)-(1-x)LiNi_0.975V_0.025O₂ (where x = 0.0, 0.3, 0.4, 0.45, 0.55, and 0.65) cathode materials. These materials were synthesized using a two-step solid-state reaction. The crystalline structure and layered nature of the synthesized materials were confirmed through X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. Scanning electron microscopy (SEM) analysis revealed grain sizes in the range of 0.44 to 0.56 μm. The distribution of elements was examined using energy-dispersive X-ray spectroscopy (EDS) and high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM) mapping. These analyses demonstrated a uniform distribution of Ni and V in the LiNi₀.₉₇₅V₀.₀₂₅O₂ (LNV) sample, and a uniform distribution of Ni, Mn, and V in the xLi(Li_1/3Mn_2/3O₂)-(1-x)LiNi_0.975V_0.025O₂ (LMNV-x) samples. X-ray photoelectron spectroscopy (XPS) was employed to investigate the oxidation states of the constituent elements in all samples. An analysis of structural parameters revealed a clear dependence on the Li(Li_1/3Mn_2/3O₂) content within the LMNV-x series. The incorporation of Li(Li_1/3Mn_2/3O₂) improved the electrochemical performance of the LMNV materials. The LMNV-0.55 composition exhibited particularly outstanding electrochemical performance, delivering a discharge capacity of 198.8 mAh/g and retaining 90.4 % of its initial capacity after 50 cycles at a current rate of 0.1C within a voltage window of 2.8 to 4.8 V. Furthermore, LMNV-0.55 achieved the highest initial coulombic efficiency (92 %) and demonstrated superior cycling stability. Electrochemical impedance spectroscopy (EIS) corroborated these findings, identifying LMNV-0.55 as the best-performing cathode material among the synthesized samples. The electrochemical investigation demonstrated the potential of the xLi(Li_1/3Mn_2/3O₂)-(1-x)LiNi_0.975V_0.025O₂ materials as a promising approach for developing high-performance lithium-ion batteries.

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来源期刊

Results in Physics MATERIALS SCIENCE, MULTIDISCIPLINARYPHYSIC-PHYSICS, MULTIDISCIPLINARY

CiteScore

8.70

自引率

9.40%

发文量

754

审稿时长

50 days

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