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首页> 外文期刊>ACS applied materials & interfaces >Three-Dimension Hierarchical Al2O3 Nanosheets Wrapped LiMn2O4 with Enhanced Cycling Stability as Cathode Material for Lithium Ion Batteries
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Three-Dimension Hierarchical Al2O3 Nanosheets Wrapped LiMn2O4 with Enhanced Cycling Stability as Cathode Material for Lithium Ion Batteries

机译：三维分层Al2O3纳米片包裹了具有增强循环稳定性的LiMn2O4，作为锂离子电池的正极材料

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摘要

A three dimensional (3D) Al2O3 coating layer was synthesized by a facile approach including stripping and in situ self-assembly of gamma-AlOOH. The uniform flower-like Al2O3 nanosheets with high specific area largely sequesters acidic species produced by side reaction between electrode and electrolyte. The inner coating layer wrapping spinel LiMn2O4 effectively inhibits the dissolution of Mn by suppressing directive contact with electrolyte to enhance cycling stability. The rate performance is improved because of the better electrolyte storage of the assembled hierarchical architecture of the 3D coating layer affording unimpeded Li+ diffusion from electrode to electrolyte. The electrochemical results reveal the as-prepared coated LiMn2O4 sample with the amount of Al2O3 at 1 wt % exhibits superior cycle stability under room temperature even at elevated temperature. The initial specific discharge capacity is 128.5 mAh g(-1) at 0.1 C and retains 89.8% of the initial capacity after 800 cycles at 1 C rate. When cycling at 55 degrees C, the composite shows 93.6% capacity retention after 500 cycles. This facile surface modification and effective structure of coating layer can be adopted to enhance the cycling performance and thermal stability of other electrode materials for which Al2O3 plays its role.
机译：通过一种简便的方法合成了三维（3D）Al2O3涂层，该方法包括剥离和γ-AlOOH的原位自组装。具有高比表面积的均匀的花状Al2O3纳米片很大程度上隔离了由电极和电解质之间的副反应产生的酸性物质。包裹尖晶石LiMn 2 O 4的内涂层通过抑制与电解质的定向接触而有效地抑制了Mn的溶解，从而增强了循环稳定性。由于3D涂层的层级结构的电解质存储效果更好，从而提高了倍率性能，从而使Li +从电极到电解质的扩散不受阻碍。电化学结果表明，所制备的涂覆的LiMn2O4样品的Al2O3含量为1 wt％，即使在高温下，在室温下也显示出优异的循环稳定性。初始比放电容量在0.1 C时为128.5 mAh g（-1），在1 C速率下经过800次循环后，仍保持初始容量的89.8％。当在55摄氏度下循环时，复合材料在500次循环后显示出93.6％的容量保持率。可以采用这种容易的表面改性和有效的涂层结构来增强其他以Al2O3起作用的电极材料的循环性能和热稳定性。

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