| 师林涛,崔洪福,徐超祥,喻春鹏.化学通报,2020,83(1):42-49. |
| Li4Mn5O12包覆对三元正极材料结构和性能的影响 |
| Effect of Li4Mn5O12 Coating on Structure and Performance of the Ternary Cathode Materials |
| 投稿时间：2019-08-07 修订日期：2019-10-10 |
| DOI： |
| 中文关键词: 正极材料 锰酸锂 包覆 锂离子电池 |
| 英文关键词:Cathode materials Li4Mn5O12 Coating Lithium-ion battery |
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| 中文摘要: |
| LiNi1/3Mn1/3Co1/3O2具有很高的理论比容量，但是三元正极材料在高电压下长循环时，其表面结构发生较大的衰退，导致电池的循环性能和倍率性能变差。本文采用耐高电压且结构稳定的富锂尖晶石Li4Mn5O12包覆LiNi1/3Mn1/3Co1/3O2可以有效改善材料的电化学性能。通过XRD、SEM、XPS和TEM等手段对包覆后的材料进行分析，证实了在LiNi1/3Mn1/3Co1/3O2的表面形成了10nm厚的均匀Li4Mn5O12的包覆层；在循环100圈后，包覆后的LiNi1/3Mn1/3Co1/3O2仍具有179.5mAh/g的放电比容量和88.6%容量保持率，明显高于未包覆的LiNi1/3Mn1/3Co1/3O2的78.3%容量保持率。因此，利用富锂尖晶石Li4Mn5O12包覆LiNi1/3Mn1/3Co1/3O2为实现更高能量密度的锂离子电池提供了新的途径。 |
| 英文摘要: |
| LiNi1/3Mn1/3Co1/3O2 has high theoretical specific capacity, but the surface structure of the cathode material greatly decays at high charging voltage, which leads to the deterioration of cycle performance and rate performance for batteries. In this paper it was reported that LiNi1/3Mn1/3Co1/3O2 coated with lithium-rich spinel Li4Mn5O12 can effectively improve the electrochemical performance. XRD, SEM, XPS and TEM were used to analyze the cathode material. It was confirmed that Li4Mn5O12uniformly formed a coating layer of 10 nm thick on the surface of LiNi1/3Mn1/3Co1/3O2. LiNi1/3Mn1/3Co1/3O2@Li4Mn5O12 has a high discharge capacity of 179.5 mAh/g, and the capacity retention rate is 88.6% after 100 cycles, which is significantly higher than that of LiNi1/3Mn1/3Co1/3O2(78.3%). Therefore, the coating of LiNi1/3Mn1/3Co1/3O2 with lithium-rich spinel Li4Mn5O12 provides a new way to achieve a high energy density of lithium-ion batteries. |
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