Ex-situ XRD and ex-situ Raman analysis at different stages of charge/discharge cycles correlates the enhanced performance of LCO@Al2O3-5 with its structural stability and minimal structural ...

LiCoO2 （LCO）具有层状岩盐结构，是第一种商用化的锂离子电池正极材料，具有274 mAh g-1的理论容量和超过4 V的放电电压。 但是，由于LCO在较高充电电压下会迅速降解，因此LCO实际容量只有理论值约60％，且其充电电压不超过4.4V。 阻碍LCO容量提高的主要因素之一是LixCoO2从八面体三相（O3）到八面体单相（O1）和O3混合相 (H1-3)的相转变过程。 O3和H1-3之间的转变会在LCO体相和表面引起降解，从而导致差的充放电可逆性。 表面包覆 策略可以改善LCO充 …

2021年6月1日 · Furthermore, in situ X-ray diffraction (XRD) measurement is performed and the results indicate that the surface modification successfully stabilize phase structure and help to reach better reversibility of LiCoO 2 cycled to 4.5 V.

2021年5月11日 · Figure 5b shows the observed XRD pattern of the charged LCO (background diffraction was subtracted) and the XRD pattern calculated by refinement using the reported crystal structure parameters of H1−3 as the initial values, 10 with an assumed Li occupancy of 17% from the initial capacity value.

2024年7月15日 · In-situ XRD measurements were conducted to investigate the phase evolution and structural stability during the (de)intercalation process (P-LCO: Fig. S11, S-LCO-2: Fig. 4 a). During (de)lithiation, LCO cathodes undergo phase transitions from H1 to H2, M1, H3, and M2 phases, resulting in significant expansion and contraction along the c axis.

All solid-state Li-ion batteries offer unprecedented improvements in energy density and safety compared to contemporary Li-ion batteries. As one of the most common oxide cathode materials for...

2017年6月1日 · XRD analysis (Fig. 2) of the 900 °C hot-pressed LCO confirmed that the bulk LCO maintained the same crystal structure compared to the as-received powder (PDF No.: 98-000-0283) [10]. In addition, the increased intensity of (003) reflection indicates that the …

This study shows the relation between changes in the crystal structure and electrode properties of LiCoO 2 in thin-film solid-state batteries investigated by in situ X-ray diffraction (XRD) combined with electrochemical measurements.

通过对四个商品钴酸锂的xrd分析，结合检测设备的性能，我们做出以下判断：i003/i104比值表征了钴酸锂晶体结晶完整度及正离子排列有序度， 而并非为钴酸锂实验过程中的择优取向表现，理由如下：

EG@-LCO-20和EG-LCO-20+0.1S两个样品的原为XRD如图4所示。 研究者重点选取了能代表晶胞参数a,c变化的110，003峰，以及对层滑移比较敏感的107峰进行比较。 EG@-LCO-20和EG-LCO-20+0.1S充电过程中003峰的振幅分别为1.24和1.27度，非常接近。 同时，EG-LCO-20+0.1S的107峰循环过程中分峰更明显，说明其在循环过程中层滑移更剧烈。 然而，当再次放电到2.8 V时，EG@-LCO-20的003峰不能回到初始位置，而EG-LCO-20+0.1S的003峰能回到初始位置。