Enhancing lithium-ion battery performance through novel spinel/layered heterostructured cathode design: a systematic investigation of xLi₄Mn₅O₁₂·(1-x)Li₁.₂Mn₀.₅Ni₀.₂Co₀.₁O₂
Amer Abdulabbas Sakran, Hadi Arabi, Shaban Reza Ghorbani, Nasrin Azad
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引用次数: 0
Abstract
This study presents the development and characterization of a novel spinel/layered heterostructured cathode material designed for enhanced energy storage capacity of lithium-ion batteries. The investigation began with the synthesis of Li-rich layered (Li1.2Mn0.5Ni0.2Co0.1O2) and spinel (Li4Mn5O12) cathode materials via a modified sol–gel method. These materials were then integrated to create heterostructured cathodes with compositions of xLi4Mn5O12·(1-x)Li1.2Mn0.5Ni0.2Co0.1O2 (x = 0.01, 0.03, 0.05, and 0.07). Comprehensive structural characterization using X-ray diffraction (XRD), Raman spectroscopy, and high-resolution transmission electron microscopy (HR-TEM) confirmed the successful formation of the spinel/layered heterostructure. X-ray photoelectron spectroscopy validated the presence of the Li4Mn5O12 spinel structure within the heterostructure matrix and verified the valence states of transition metal ions. The electrochemical performance of the Li-rich layered and heterostructure cathode materials was assessed through various measurements, including galvanostatic charge–discharge at different C rates, cyclic voltammetry, differential capacity, and electrochemical impedance spectroscopy. Electrochemical performance evaluation revealed that the optimized composition (x = 0.01) exhibited superior performance metrics, delivering specific capacities of 299.38, 231.48, 205.03, 174.93, and 115.67 mAh g⁻1 at rates of 0.1C, 0.5C, 1C, 2C, and 5C, respectively. Notably, this composition maintained a stable capacity of 175.3 mAh g⁻1 after 100 cycles at 1C rate, representing a 76.89% capacity retention. The enhanced performance is attributed to the synergistic effect of the ultrathin spinel layer, which facilitates Li-ion diffusion kinetics while protecting the layered structure from electrolyte degradation.
本研究提出了一种新型尖晶石/层状异质结构正极材料的开发和表征,该材料旨在增强锂离子电池的储能能力。本文首先采用改进的溶胶-凝胶法制备了富锂层状(Li1.2Mn0.5Ni0.2Co0.1O2)和尖晶石(Li4Mn5O12)正极材料。然后将这些材料集成到xLi4Mn5O12·(1-x)Li1.2Mn0.5Ni0.2Co0.1O2 (x = 0.01, 0.03, 0.05和0.07)的异质结构阴极中。利用x射线衍射(XRD)、拉曼光谱(Raman spectroscopy)和高分辨率透射电子显微镜(HR-TEM)进行综合结构表征,证实了尖晶石/层状异质结构的成功形成。x射线光电子能谱证实了异质结构基体中存在Li4Mn5O12尖晶石结构,并验证了过渡金属离子的价态。通过不同C速率下的恒流充放电、循环伏安法、差分容量和电化学阻抗谱等多种测量方法,对富锂层状和异质结构阴极材料的电化学性能进行了评价。电化学性能评价表明,优化后的组合物(x = 0.01)表现出优异的性能指标,在0.1C、0.5C、1C、2C和5C的速率下,其比容量分别为299.38、231.48、205.03、174.93和115.67 mAh g - 1。值得注意的是,这种成分在1C速率下循环100次后保持了175.3 mAh g - 1的稳定容量,代表了76.89%的容量保留率。超薄尖晶石层的协同作用促进了锂离子的扩散动力学,同时保护了层状结构免受电解质降解。
期刊介绍:
Ionics is publishing original results in the fields of science and technology of ionic motion. This includes theoretical, experimental and practical work on electrolytes, electrode, ionic/electronic interfaces, ionic transport aspects of corrosion, galvanic cells, e.g. for thermodynamic and kinetic studies, batteries, fuel cells, sensors and electrochromics. Fast solid ionic conductors are presently providing new opportunities in view of several advantages, in addition to conventional liquid electrolytes.