Single‐crystal spinel Li1.08Mn1.92O4 octahedra cathode covered with Li-ion permeable robust NMC thin-layer protection for high voltage lithium‐ion batteries

Lower Diffusion‐Induced Stress in Nano‐Crystallites of P2‐Na2/3Ni1/3Mn1/2Ti1/6O2 Novel Cathode for High Energy Na‐ion Batteries

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ion battery research has been evolving as an indigenous solution to electrochemical energy storage applications. [1][2][3][4] This is in light of the high availability and inexpensiveness of Na resources, sustainability, and redox chemistry similar to lithium-ion batteries. [5] Amidst the various cathode materials being explored for Na-ion batteries, the P2-type Na 2/3 Ni 1/3 Mn 2/3 O 2 is a preeminent one, [6] owing to the environmental friendliness, [7] facile synthesis, [8] superior specific capacity (theoretical capacity, 173 m Ah g −1 ), [9] higher operating voltage (ideally ≈3.7 V), [10] higher energy density, [11,12] open prismatic framework for sodium-ion diffusion with a low diffusion barrier, [13] good structural integrity [14] cobalt free composition, and air-moisture insensitiveness.

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Engineering commercial polycrystalline precursors to single crystal Ni-rich cathodes with outstanding long-cycle performance

“…S6, † the SEM images of single-crystal SC-523 and SC-811 both exhibit a single-crystal morphology which is similar to that of SC-3, indicating that the present method is highly universal to prepare other kinds of singlecrystal NCMs. 17 Transmission electron microscopy (TEM) (Fig. 2h and j), selected area electron diffraction (SAED) (Fig.…”

“…14 Among them, structure transformation featuring with conversion of polycrystalline material to a single crystal structure could efficiently eliminate grain-boundaries, is a promising and effective strategy. [15][16][17][18][19] Microcracks within the interparticle boundaries during the rst charge of polycrystalline NCM substantially reduce the mechanical integrity of the cathode. [20][21][22] Thus, suppressing the microcracking along boundaries of primary particles is imperative to alleviate the capacity decline of Ni-rich layer cathodes.…”

“…14 Among them, structure transformation featuring with conversion of polycrystalline material to a single crystal structure could efficiently eliminate grain-boundaries, is a promising and effective strategy. 15–19…”

Enhancing the Integral Structural and Thermal Stability of Ultrahigh-Ni Cathodes via Morphology Refinement and In Situ Interfacial Engineering

“…Electric vehicles (EVs) driven by repeated rechargeable batteries have attracted much attention with the nonrenewable resources’ exhaustion. , The growing demands of driving range continuously push layered cathode materials, especially LiNi x Co y Mn 1– x – y O 2 delivering a theoretical specific capacity of about 274 mAh·g –1 , into development toward a higher nickel content ( x ≥ 0.8). − Nevertheless, high-nickel cathodes easily suffer from deterioration of electrochemical performance and chemomechanical properties during extended cycling. − This recession of the polycrystalline materials is reflected in the propagation of intergranular cracks in the secondary particles during the charge and discharge process, resulting in that the electrolyte dissolves the transition metal ions along a newborn surface from the outside to the bulk and integral structural stability declines. , …”