Ni-rich cathode LiNixCoyMn1-x-yO2 (NCM, x ≥ 0.5) materials are promising cathodes for lithium-ion batteries due to their high energy density and low cost. However, several issues, such as their...

2023年8月1日 · The X-ray diffraction (XRD) analysis of NCM622 was performed on a Bruker AXS D8 X-ray diffractometer with Cu-Ka rays to analyze the information on crystal structure and lattice parameters of the newly prepared and recycled materials, respectively, and to observe the morphology and local structural information of the material using a field ...

(a) Refined XRD pattern of NCM622 material based on LiNiO2 hexagonal (R3¯m) phase and magnified view of (108) and (110) peaks; (b) The atomic structure of NCM622 vertical viewed (110) and...

在快速充电过程中，外部区域的锂离子离开颗粒，留下锂空位，但在短时间内，颗粒内部区域的锂离子无法迁移到外表面。 如现场原位XRD结果所示，颗粒内这种有限的锂扩散会暂时诱导颗粒内富锂相 (H1)和贫锂相 (H2)之间的相分离。

2021年3月9日 · The highest degree of peak splitting of both (006)/ (012) and (018)/ (110) doublets again demonstrates the best ordered layered structure of NCM622 materials. The Rietveld refinement of the XRD analysis (Fig. S2 and Fig. S3) and the corresponding cell’s parameters are tabulated in Table 2.

2021年5月1日 · In order to elucidate the influence of ZVO coating layer on the struture of bulk NCM622 cathode material, in-situ XRD technique was employed to study the temperature-related structure evolution.

2024年3月1日 · TiO 2&TiN modulated electrodes enable NCM622||Graphite full batteries to achieve excellent electrochemical and thermal safety performance. The effective strategies have clearly revealed the interface compatibility, lithium storage performance and thermal safety improvement mechanism caused by adding TiO 2 and TiN.

LiNi0.6Co0.2Mn0.2O2 (NCM622) is a highly promising cathode material owing to its high capacity; however, it is characterized by inferior cycling performance and safety...

图3 不同煅烧温度制备NCM622的XRD精修: (a) 800 ℃, (b) 850 ℃ and (c) 900 ℃； (d)不同煅烧温度制备NCM622的形成能 图4 (a)不同煅烧温度制备NCM622的首次充放电曲线； (b)长循环性能； (c)倍率性能； (d)电化学阻抗

所制备的NCM622材料在最佳条件下能够达到最高191.3 mAh·g -1 的放电比容量，充放电循环也能有最高88.74%的容量保持率。 关键词: 锂离子电池, 正极材料, 层状氧化物, 电化学. Abstract: The secondary battery based on lithium-ion battery has entered the mainstream.