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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Suppressed voltage decay and improved electrochemical performance by coating LiAl5O8 on the surface of Li1.2Mn0.54Ni0.13Co0.13O2
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Suppressed voltage decay and improved electrochemical performance by coating LiAl5O8 on the surface of Li1.2Mn0.54Ni0.13Co0.13O2

机译：通过在Li1.2Mn0.54Ni0.13Co0.13O2的表面上涂覆LiAn5O8，抑制电压衰减和改善的电化学性能

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摘要

LiAl5O8-coated Li1.2Mn0.54Ni0.13Co0.13O2 cathode materials were synthesized by using the co-precipitation method along with a facile sol-gel coating process. Homogeneous and 3-5 nm thin LiAl5O8 film was formed on the LMNC surface. After the coating modification, discharge specific capacity, the initial Coulombic efficiency, and rate performance were improved to some extent. It was particularly important to note that the voltage decay of the battery after the charge and discharge cycle was well suppressed. Specifically, the 3 wt% LiAl5O8-coated electrode can deliver the initial discharge capacity of 243.5 mAh g(-1) with a low irreversible capacity loss of 51.1 mAh g(-1) and the initial Coulombic efficiency reached the maximum of 82.63% at 0.1 C rate. Although the 1 wt% LiAl5O8-coated electrode was cycled through 100 cycles at a rate of 0.5 C, the capacity retention rate was still up to 95.8%, while that of the LiAl5O8-free one was only 82.8%. The stable and thin LiAl5O8 coating layer protected the electrode structure from HF corrosion and other side reactions and reduced the oxygen loss (in the form of Li2O) by suppressing the initial activation of Li2MnO3. (C) 2019 Elsevier B.V. All rights reserved.
机译：通过使用共沉淀法以及容易溶胶 - 凝胶涂布方法合成LiAl5O8涂覆的Li1.2Mn0.54Ni0.13CO0.13O2正极材料。在LMNC表面上形成均相和3-5nm薄的LiAl5O8膜。在一定程度上提高了涂层改性，放电特定容量，初始库仑效率和速率性能。特别重要的是要注意，电荷和放电循环后电池的电压衰减很好地抑制。具体地，3wt％的LiAl5O8涂覆电极可以以低不可逆的容量损失为51.1mAhg（-1）的初始放电容量为243.5mAhg（-1），初始库仑效率最高达到82.63％ 0.1 c速率。尽管以0.5℃的速率将1wt％LiAl5O8涂覆的电极循环通过100次循环，但容量保持率仍高达95.8％，而LiAl5O8的速率仍然高达95.8％。通过抑制Li2MNO3的初始活化，稳定且薄的LiAl5O8涂层保护电极结构免受HF腐蚀和其他副反应，并通过抑制Li2MNO3的初始活化来降低氧气损失（以Li2O的形式）。 （c）2019 Elsevier B.v.保留所有权利。

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