Oxygen vacancies in CeO2 surface coating to improve the activation of layered Li1.2Mn0.54Ni0.13Co0.13O2 cathode material for Li-ion batteries
Oxygen vacancies in CeO2 surface coating to improve the activation of layered Li1.2Mn0.54Ni0.13Co0.13O2 cathode material for Li-ion batteries
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CeO2表面涂层中的氧空位提高锂离子电池层状Li1.2Mn0.54Ni0.13Co0.13O2正极材料的活化
DOI：
10.1007/s11581-018-2655-7
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发表时间：
2018-07
期刊：
影响因子：
2.8
通讯作者：
Jianling Li
中科院分区：
文献类型：
--
作者：
Kai Yang;Yanying Liu;Bangbang Niu;Zhe Yang;Jianling Li
本文报道了采用多用途水热法在Li1.2Mn0.54Ni0.13Co0.13O2正极材料表面涂覆纳米ceo2。通过XRD、SEM、TEM等手段对制备的纳米ceo2包覆Li1.2Mn0.54Ni0.13Co0.13O2材料进行了表征。结果表明，合成的纳米ceo2材料具有丰富的氧空位，并在基体表面形成尖晶石相层。电化学测试结果表明，含4 wt% CeO2涂层的Li1.2Mn0.54Ni0.13Co0.13O2具有良好的倍率性能和增强的循环稳定性，在2.0 ~ 4.8 V （vs. Li/Li+）电位范围内，初始放电容量为298.5 mAh g−1 (0.05 C)，高于281.9 mAh g−1，初始库仑效率为86.94%，高于原始库仑效率77.28%。值得注意的是，这种改进策略大大降低了活性材料第一次循环的不可逆容量损失（ICR），在12.5 mA g−1 （0.05 C）电流密度下，C3的ICR （44.8 mAh g−1）明显低于原始材料（82.9 mAh g−1）。这种改善主要是由于纳米ceo2涂层中的氧空位促进了Li2MnO3的活化。尖晶石结构的形成有利于稳定块状材料的晶格，并通过独特的三维输运通道促进Li+的扩散。
This work reports the surface coating of Li1.2Mn0.54Ni0.13Co0.13O2 cathode material with nano-CeO2 by a versatile hydrothermal method. Thus, obtained nano-CeO2-coated Li1.2Mn0.54Ni0.13Co0.13O2 material was characterized by XRD, SEM, and TEM. It is revealed that the synthesized nano-CeO2 material has rich oxygen vacancies, and a spinel-phase layer is formed on the surface of host material. The electrochemical testing results show that Li1.2Mn0.54Ni0.13Co0.13O2 with 4 wt% CeO2 coating (denoted as C3) has good rate capability and enhanced cyclic stability, enhanced initial discharge capacity of 298.5 mA h g−1 (0.05 C) compared to 281.9 mAh g−1, and excellent initial coulombic efficiency of 86.94% compared to 77.28% for the pristine one in the potential range 2.0–4.8 V (vs. Li/Li+). It is worth noting that this modified strategy greatly reduces the irreversible capacity loss (ICR) of the first cycle of active materials, the ICR of the C3 (44.8 mAh g−1) is markedly lower than pristine material (82.9 mAh g−1) at the current density of 12.5 mA g−1 (0.05 C). Such improvements are mainly ascribed to the oxygen vacancies in nano-CeO2 coating layer, which are responsible for the promoted activation of Li2MnO3. Moreover, the formation of the spinel structure is beneficial to stabilize the crystal lattice of the bulk material and facilitate Li+ diffusion by unique 3D transport channels.
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