Li Yu, Bai Ying, Bi Xuanxuan, Qian Ji, Ma Lu, Tian Jun, Wu Chuan, Wu Feng, Lu Jun, Amine Khalil
Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, P.R. China.
Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing, 100081, P.R. China.
ChemSusChem. 2016 Apr 7;9(7):728-35. doi: 10.1002/cssc.201501548. Epub 2016 Mar 4.
Rechargeable lithium-ion batteries with high energy and high power density are required in the application of electric vehicles and portable electronics. Herein, we introduce a type of spherical Li-rich cathode material, Li1.2Ni0.2Mn0.6O2, assembled from uniform nanocubes by a facile polyvinylpyrrolidone (PVP)-assisted hydrothermal method. The material with a hierarchical nano-/microstructure exhibits stable high-rate performance. Furthermore, the precipitant (i.e., urea) and the structure-directing agent (i.e., PVP) effectively activated the Li2 MnO3 components in the microscale material to achieve a high specific capacity of 298.5 mAh g(-1) in the first cycle. This Li-rich cathode material still delivered 243 mAh g(-1) at 0.1 C after 200 cycles and the capacity retentions at 0.5, 1, 2, and 5 C were 94.4, 78.7, 76.3, and 67.8% after 150 cycles, respectively. The results make this Li-rich nano-/microstructure a promising cathode material for long-life and high-performance lithium-ion batteries.
电动汽车和便携式电子产品的应用需要具有高能量和高功率密度的可充电锂离子电池。在此，我们介绍一种球形富锂正极材料Li1.2Ni0.2Mn0.6O2，它是通过简便的聚乙烯吡咯烷酮（PVP）辅助水热法由均匀的纳米立方体组装而成。这种具有分级纳米/微观结构的材料表现出稳定的高倍率性能。此外，沉淀剂（即尿素）和结构导向剂（即PVP）有效地激活了微观尺度材料中的Li2MnO3组分，在第一个循环中实现了298.5 mAh g(-1)的高比容量。这种富锂正极材料在200次循环后，在0.1 C时仍能提供243 mAh g(-1)的比容量，在150次循环后，在0.5、1、2和5 C时的容量保持率分别为94.4%、78.7%、76.3%和67.8%。这些结果使这种富锂纳米/微观结构成为长寿命和高性能锂离子电池的一种有前景的正极材料。
