Layered Lithium transition metal oxides, primarily, LiNixMnyCozO2 (NMC) (x + y + z = 1), represent a prominent class of cathode materials for LIBs due to their high energy density and capacity.

2020年1月1日 · We report a systematic investigation of the water stability of four different NMC cathode powders with varying nickel contents (NMC 333, NMC 532, NMC 622, and NMC 811). Transition metal oxides are known to react with water to form hydroxyl groups, and the resulting basic solution can corrode the Al current collector [ [22] , [23] , [24] , [25] ].

2024年1月15日 · The optimised sample of NMC 532 with the mole ratio of urea with transition metals (5:2) and hydrothermal at 200 °C for 24 h delivers the highest discharge capacity of 161.7 mAhg −1.

While the O 1s spectra of NMC cathodes from NMC-LTO and NMC-graphite cells show only minor dissimilarities, the O 1s spectrum of NMC from NMC-Li-metal cell displays much larger peak at...

2019年1月15日 · X-ray photoelectron spectroscopy (XPS) is carried out on the surface of the cathode materials before and after formation and cycling to investigate the effects of solid electrolyte interphase (SEI) formation on the electrochemical performance.

XPS of NaNMC-532; (a) survey scan, (b) Na1s, (c) Ni2p, (d) Mn2p, (e) Co2p, (f) O 1s and (g) C1s. In this work, we report the practical realization of 3.6 V Sodium-ion coin and multi-electrode...

2020年4月29日 · Herein, in situ electrochemical impedance spectroscopy (EIS), direct current (DC) resistance and differential voltage analysis (DVA) are complementarily used to understand and predict the lifetime of LiNi 0.6 Mn 0.2 Co 0.2 O 2 (NMC622) vs graphite coin cells cycled at different upper cut-off voltage (UCV).

摘要 使用 X 射线光电子能谱 (XPS) 对 Ni2+/Ni3+ 进行定量分析对于评估锂镍钴锰氧化物 (Li[NixMnyCoz]O2, NMC) 的晶体结构和电化学性能非常重要。然而，基于高斯/洛伦兹 (G/L) 峰拟合的定量分析面临重现性和有效性的挑战。在本研究中，合成了 Ni2+ 和 Ni3+ 标准样品以及一系列具有不同 Ni 掺杂水平的 NMC 样品。

2023年11月3日 · XPS data indicate formation of LiHCO3/Li2CO3 at the surface and a Li-deficient oxide in the sub-surface region of the pristine compds., and the presence of adsorbed water and transition metal hydroxides at the exposed sample surfaces.

2018年5月31日 · Quantitative analysis of Ni 2+ /Ni 3+ using X-ray photoelectron spectroscopy (XPS) is important for evaluating the crystal structure and electrochemical performance of Lithium-nickel–cobalt-manganese oxide (Li[Ni x Mn y Co z]O 2, NMC). However, quantitative analysis based on Gaussian/Lorentzian (G/L) peak fitting suffers from the challenges ...