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

Abstract

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.

An Effectively Activated Hierarchical Nano‐/Microspherical Li1.2Ni0.2Mn0.6O2 Cathode for Long‐Life and High‐Rate Lithium‐Ion Batteries

“…Interestingly, the spinel phase is found in the primary nanocubes surface, as shown in Figure f. The interplanar spacing of the lattice fringes was measured to be 0.206 nm, which is well indexed to the (4 0 0) plane of the cubic‐spinel structure . Heterostructure layered and spinel Li‐rich cathode materials can exhibit excellent electrochemical performance, so LNMO‐PVP with the ultrathin spinel phase is expected to have high structure stability and good rate performance . The diffusion of metal ions leads to integration of the spinel phase into the layered structure in the cathode materials, and thus, the interface between the layered and spinel phase should have good Li + penetrability.…”

High Rate Capability and Excellent Thermal Stability of Li+-Conductive Li2ZrO3-Coated LiNi1/3Co1/3Mn1/3O2 via a Synchronous Lithiation Strategy

“…In order to reduce side reaction and improve the capacity and life, surface modification has been extensively explored. 10−17 Different coating materials including ZrO 2 , 10 MgO, 11 Al 2 O 3 , 12 SiO 2 , 13 AlF 3 , 14 Al, 15 carbon, 16 and graphene 17 have been reported. However, most of these coating materials, especially oxides, are insulator to Li ion, which influences the overall rate capability due to the low Li-ion diffusion ability in the interface of cathode/electrolyte.…”

Composite‐Structure Material Design for High‐Energy Lithium Storage

“…Spinel cathode materials exhibit high Li + ionic and electronic conductivity due to the efficient 3D Li + diffusion channels. However, the spinel cathode delivers a limited capacity of less than 150 mAh g −1 . In order to meet the application requirements, combining the merits of the layered and spinel structure materials to render a material with superior rate performances has attracted much attention in recent years.…”

“…In order to meet the application requirements, combining the merits of the layered and spinel structure materials to render a material with superior rate performances has attracted much attention in recent years. Moreover, the integrated spinel phase could stabilize the structure of the “layered–layered” materials to suppress their structural evolution during electrochemical charge/discharge process . In addition, the cubic close‐packed oxygen arrays in the layered and spinel oxides are all structurally compatible .…”