Composite Li[Li_0.11Mn_0.57Ni_0.32]O₂: Two-step molten-salt synthesis, oxidation state stabilization, and uses as high-voltage cathode for lithium-ion batteries

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• 作者：Chuang Yu^a ; Guangshe Li^b ; Xiangfeng Guan^b ; Jing Zheng^a ; Liping Li^a ; ^{lipingli@fjirsm.ac.cn}
• 关键词：Two-step molten-salt ; Composites ; Li[Li0.11Mn0.57Ni0.32]O2 ; High-voltage ; Lithium-ion batteries
• 刊名：Journal of Alloys and Compounds
• 出版年：2012
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：5 July, 2012
• 卷：528
• 期：Complete
• 页码：121-125
• 文件大小：752 K

摘要

Composite Li[Li_0.11Mn_0.57Ni_0.32]O₂ was initially prepared by a two-step molten-salt method for uses as high-voltage cathode of lithium-ion batteries. This new synthetic route involves a low-temperature melting process of sodium acetate and a second high-temperature melting process of sodium carbonate, which is proved to be advantageous in simplifying the preparation processes of stabilizing oxidation states of framework metal ions at Mn⁴⁺ and Ni²⁺. In particular, the melting temperature of 900 掳C for the second process is found to be crucial for the formation of the composite. The resultant composite crystallized in a layered structure, and was constructed by particles with dimensions about 100-150 nm. As a consequence of the stabilization of oxidation state and the formation of layered structure, the composite, when acting as a high-voltage cathode for lithium-ion batteries, exhibited a reproducible electro-chemical performance as featured by an initial discharge capacity of 250.8 mAh g^鈭? between 4.6 V and 2.0 V and a high cycling ability with little capacity decay at a current density of 20 mAg^鈭?.