The positive roles of integrated layered-spinel structures combined with nanocoating in low-cost Li-rich cathode Li[Li_0.2Fe_0.1Ni_0.15Mn_0.55]O₂ for lithium-ion batteries

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[Li_0.2Fe_0.1Ni_0.15Mn_0.55]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.