The mechanically stable and Li-conducting solid solution of lithium aluminosilicate (LiAlSiO or LiO·AlO·2SiO, LASO) has been regarded as one of effective coating materials to suppress the adverse transformation of well-crystallized LiCoO (LCO) into Li-insulating CoO, but its functional mechanism is still ambiguous so far. In this study, as-prepared LCO nanocrystallites are previously dispersed in the formation system of amorphous LASO, and the resulting LCO@LASO is applied as Li-ion battery cathodes to elaborate a reinforcing mechanism of the amorphous coating for the Li-ion insertion/extraction behaviors of 4.6 V LiCoO. Aside from a synergistic effect of the three components (i.e., LiO, AlO and SiO) in coating layer, the much higher high-rate capability (i.e., 149.1 mAh g, 2.0 C) and long-term cycling stability (160.1 mAh g, 0.5 C, the 360th cycle) of LCO@LASO than those (50.5 mAh g, 2.0 C; 142.4 mAh g, 0.1 C, the 100th cycle) of the uncoated counterpart suggests a potential application of the amorphous LASO in achieving the high-voltage electrochemical properties of nanocrystalline LiCoO in future.

中文翻译：

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非晶LiAlSiO4涂层改变了纳米晶LiCoO2在4.6 V下的晶体结构稳定性和电化学行为

机械稳定且导锂的硅铝酸锂固溶体（LiAlSiO或LiO·AlO·2SiO，LASO）被认为是抑制良好结晶的LiCoO（LCO）向锂绝缘CoO的逆转变的有效涂层材料之一，但其作用机制至今仍不明确。在本研究中，将所制备的LCO纳米晶预先分散在非晶LASO的形成体系中，并将所得的LCO@LASO用作锂离子电池正极，以阐述用于锂离子插入/插入的非晶涂层的增强机制。 4.6 V LiCoO 的萃取行为。除了涂层中三种成分（即Li2O、Al2O和SiO）的协同作用外，还具有更高的高倍率性能（即149.1 mAh g，2.0 C）和长期循环稳定性（160.1 mAh g， LCO@LASO 的比值（50.5 mAh g，2.0 C；142.4 mAh g，0.1 C，第 100 次循环）的 LCO@LASO 比未涂层对应物的（50.5 mAh g，2.0 C；142.4 mAh g，0.1 C，第 100 次循环）表明非晶 LASO 在实现高电压方面的潜在应用纳米晶LiCoO未来的电化学性能