Beijing Key Laboratory of Environmental Science and Engineering, School of Chemical Engineering and the Environment, Beijing Institute of Technology , Beijing 100081, China.
ACS Appl Mater Interfaces. 2014 Dec 10;6(23):21711-20. doi: 10.1021/am506934j. Epub 2014 Nov 25.
As the most promising cathodes of lithium-ion batteries, lithium-rich manganese-based layered oxides with high capacity suffer from poor cycle stability, poor rate capability, and fast voltage fading. Here we introduced AlF3 into the surface of layered lithium-rich cathode (Li[Li0.2Fe0.1Ni0.15Mn0.55]O2) as an artificial protective layer as well as an inducer of integrated layered-spinel structures to achieve both low cost and high capacity. The reduced irreversible capacity loss, improved cycling stability, and superior high-rate capability were ascribed to the combination of AlF3 nanocoating and the unique structures as well as the low charge transfer resistance. Besides, the intractable issue, fast voltage fading of the layered lithium-rich cathode was also alleviated. Such materials with both low cost and high capacity are considered to be promising candidate cathodes to achieve lithium-ion batteries with high energy and high power.
作为最有前途的锂离子电池正极材料之一，高容量富锂锰基层状氧化物存在循环稳定性差、倍率性能差和电压衰减快等问题。在此，我们将 AlF3 引入层状富锂正极（Li[Li0.2Fe0.1Ni0.15Mn0.55]O2）的表面，作为一种人工保护层和集成层状-尖晶石结构的诱导剂，以实现低成本和高容量。减少不可逆容量损失、改善循环稳定性和优异的倍率性能归因于 AlF3 纳米涂层与独特结构的结合以及低电荷转移电阻。此外，层状富锂正极的棘手问题，即快速电压衰减也得到了缓解。这种具有低成本和高容量的材料被认为是很有前途的候选正极材料，可用于实现具有高能量和高功率的锂离子电池。
