High-nickel LiNi 0.9 Co 0.01 Mn 0.09 O 2 cathode materials demonstrate significant potential for next-generation lithium-ion batteries (LIBs) due to their high energy density and low cost. However, the reduced cobalt content in these high-nickel materials often results in structural degradation and poor cycling stability. In this work, the material referred to as NCM919 was prepared through a homogeneous co-precipitation method, followed by the introduction of W 6+ doping to enhance cycling stability. The electrochemical performance results indicate that the cathode doped with 1.0 mol% W 6+ (NCM-1.0 W) exhibits improved electrochemical characteristics. NCM-1.0 W shows an initial discharge capacity of 182.74 mAh/g at a rate of 0.5 C, with 97.86% of the initial capacity retained after 100 cycles within a voltage range of 2.5 ~ 4.3 V. Additionally, NCM-1.0 W achieves an initial discharge capacity of 197.99 mAh/g at a rate of 1.0 C, with 85.68% of the initial capacity maintained after 100 cycles in a voltage range of 2.5 ~ 4.5 V.
Dezhi Chen,Shasha Chen,Hongying Quan,Zhongning Huang,Lin Lu,Xubiao Luo,Lin Guo
Combining hydrothermal treatment and photocatalytic deposition, W 6+ doping TiO 2 composites modified with Au nanoparticles (Au/W–TiO 2 ) were synthesized successfully. A series of characterization techniques including X-ray diffraction, scanning electron microscopy, transmission electron microscopy and N 2 adsorption indicated that the Au nanoparticles are distributed homogeneously on the W 6+ doping TiO 2 clusters with mesoporous structures. The photocatalytic properties of the Au/W–TiO 2 nanocomposites were evaluated through the photodegradation of organic dye in aqueous solution and characterized in detail by UV–visible diffuse reflectance spectra and PL fluorescence spectra. Compared with the three samples of pristine TiO 2 , W 6+ doping TiO 2 and Au/TiO 2 , the resulting Au/W–TiO 2 nanocomposites exhibited an enhanced photocatalytic performance for degradation of contaminant under simulated solar light and visible light irradiation. Under simulated solar light irradiation (duration: 15 min), 84.6%, 77.8%, 67.8% and 47.6% of organic dye was decomposed by Au/W–TiO 2 , Au/TiO 2 , W–TiO 2 and bare TiO 2 , respectively. Furthermore, the degradation rate of organic dye is 98%, 90%, 76%, and 62% for Au/W–TiO 2 , Au/TiO 2 , W–TiO 2 and pure TiO 2 under visible light irradiation for 90 min, respectively. The enhanced photocatalytic activity is attributed to the synergetic effects of W 6+ doping and Au modification, which can effectively improve the light absorption intensity and, the range, increase the adsorption active sites and reduce the electron–hole pair recombination in TiO 2 .
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