The multiple effects of Al-doping on the structure and electrochemical performance of LiNi0.5Mn0.5O2 as cathode material at high voltage

Boosting the Cyclic Stability of Aqueous Zinc-Ion Battery Based on Al-Doped V10O24·12H2O Cathode Materials

“…The Al-doped material does not have any obvious peak position shift which is probably because of the low doping level. 24,32 The SEM, TEM, and high-resolution transmission electron microscopy (HRTEM) images (depicted as Figures 1b, S1a, and S2) show that the slightly curly V 10 O 24 nanobelts with a uniform size of 0.2 μm in width and tens of micrometers in length are well dispersed. The layer with an interplanar spacing of 0.182 μm, depicted in Figure S2, is consistent with the (−518) plane and matches well with XRD results.…”

Dual Substitution Strategy in Co-Free Layered Cathode Materials for Superior Lithium Ion Batteries

“…However, excessive substitution may form an oxide on the surface and the reversible capacity of the material is reduced. Figure (c) shows the discharge midpoint potential for four materials at the 3 rd , 60 th , 120 th , and 180 th cycles in the voltage range of 3.0–4.8 V at a constant rate 0.2 C. Our previous experiments have shown that the discharge midpoint potential for LiNi 0.5 Mn 0.5 O 2 decreases quickly as the cycle number increases . In contrast, the discharge midpoint potential for the dual-substitution material decreases slowly.…”

“…Recent studies have shown that Al substitution can inhibit the phase transition at high voltage. ,, Wang et al have reported that LiNi 0.475 Mn 0.475 Al 0.05 O 2 prepared by substitution of Al-ion into LiNi 0.5 Mn 0.5 O 2 could reduce Li/Ni cation disorder and enhance the discharge capacity and cycle stability . Our previous study found that the Al-substitution sample LiNi 0.47 Al 0.03 Mn 0.5 O 2 could effectively restrain the oxygen-activating reaction . In summary, Al substitution can improve the thermal stability and structural stability of the cathode material and help to improve the cycling performance as well as high-temperature performance of the material. , …”

“…Our previous study found that the Al-substitution sample LiNi 0.47 Al 0.03 Mn 0.5 O 2 could effectively restrain the oxygen-activating reaction . In summary, Al substitution can improve the thermal stability and structural stability of the cathode material and help to improve the cycling performance as well as high-temperature performance of the material. , …”

Two-dimensional metal–organic frameworks and their derivatives for electrochemical energy storage and electrocatalysis

“…2D MOFs for the OER. Similar to the transition metal (Fe, Co, Ni, Mn) oxide/hydroxide/oxyhydroxide based highperformance OER electrocatalysts, [126][127][128][129][130] MOFs containing transition metal ions could also exhibit high catalytic performance toward the OER ( Table 2). The Pang group synthesized ultrathin 2D Co 2 (OH) 2 (BDC) nanosheets with a thickness of $2 nm by a simple surfactant-assisted hydrothermal method, which exhibited good electrocatalytic activity for the OER with a low overpotential of 263 mV at 10 mA cm À2 , a Tafel slope of 74 mV dec À1 , and good stability ($5% degradation for 4 h at 1.5 V vs. RHE) in 1.0 M KOH.…”