Enhanced electrochemical properties of Ni-rich layered cathode materials via Mg2+ and Ti4+ co-doping for lithium-ion batteries

Wang, Jiale; Nie, Yan; Miao, Chang; Tan, Ying; Wen, Minyue; Xiao, Wei

doi:10.1016/j.jcis.2021.05.167

Cited by 79 publications

(16 citation statements)

References 43 publications

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“…From Rietveld refinement results (Table S2 of the Supporting Information), the lattice parameters a / b and c gradually increase with the calcination temperature. The expanded lattice favors the transport of lithium ions . The intensity ratio of the (003)/(104) peak in the XRD pattern reflects the degree of cation mixing, and a higher ratio suggests less Ni in the Li layer. , While the I (003)/ I (104) values of all of the CG-NCA series are higher than 1.2, CG-NCA-750 has the highest value of 1.634, suggesting the lowest cation mixing.…”

Section: Results and Discussionmentioning

confidence: 99%

Concentration-Gradient LiNi_0.85Co_0.12Al_0.03O₂ Cathode Assembled with Primary Particles for Rechargeable Lithium-Ion Batteries

2021

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Concentration-gradient structure design is a promising strategy to stabilize layered nickel-rich LiNi1–x–y Co x Al y O2 (NCA, 1 – x – y ≥ 0.8) cathode materials. However, the influence of the particle size on the properties of concentration-gradient NCA material has not been explored in detail. Here, we report the synthesis of concentration-gradient LiNi0.85Co0.12Al0.03O2 (CG-NCA) cathode microspheres assembled with different sizes of primary particles by adjusting the calcination temperature. The prepared CG-NCA assembled with 300–500 nm primary particles exhibits remarkable cyclic stability (capacity retention of 99.9% after 100 cycles at 1 C), high rate capability (145.6 mAh g–1 at 10 C), and thermal stability. The superior electrochemical performance is mainly attributed to the combination of the ordered layered structure and concentration-gradient distribution of Ni and Al in NCA. Small primary particles lead to a rapid impedance increase and severe side reactions, while large primary particles unfavor Li-ion diffusion. The results indicate the importance of primary particle size control in enhancing the performance of concentration-gradient Ni-rich cathode materials.

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Section: Results and Discussionmentioning

confidence: 99%

Concentration-Gradient LiNi_0.85Co_0.12Al_0.03O₂ Cathode Assembled with Primary Particles for Rechargeable Lithium-Ion Batteries

2021

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“…An oblique line appears in the low-frequency region, which is related to the diffusion of Li + in the material. [35][36][37][38][39][40] Table 2 summarizes the fitting results of R s , R f , and R ct for the two samples. All values of R s , R f , and R ct for WN92 are obviously less than that of N92, no matter it is measured after the first or the 100 th chargedischarge cycles.…”

Section: Enhanced Cyclability Due To Reduced Resistance and Suppresse...mentioning

confidence: 99%

Atomic Horizons Interpretation on Enhancing Electrochemical Performance of Ni‐Rich NCM Cathode via W Doping: Dual Improvements in Electronic and Ionic Conductivities from DFT Calculations and Experimental Confirmation

Gao

Huang

Dong

et al. 2022

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270 mAh g −1 , are candidates for the next generation of lithium-ion batteries (LIBs). [7,8] NCM cathodes with high nickel content have attracted increasing attention because of their higher capacities when more nickel cations provide a more electron transfer from Ni 2+ /Ni 3+ and Ni 3+ /Ni 4+ redox pairs. [9,10] Meanwhile, since the relative content of expensive cobalt will be reduced, the production cost will also be decreased. Therefore, it is a trend to increase the proportion of nickel in the ternary system of LiNi 1−x−y Co x Mn y O 2 . [11] However, when the nickel content exceeds 80%, [12,13] the battery suffers from serious capacity degradation during the cycle.The main role of elemental doping is to reduce the mixing of Li and Ni cations and stabilize the crystal structure. It is a feasible approach to slow the capacity decay. Presently, it has been found that W 6+ is a good choice as a doping element. W 6+ has a higher valence and stronger bond energy compared to other ions (such as Al 3+ , Mg 2+ , Ba 2+ , and Zn 2+ ), resulting in a dual functional enhancement of the electronic and cationic conductivities. In 2018, Kim [14] proposed that, after the doping with 1 mol% W into Ni-rich LiNi 0.9 Co 0.05 Mn 0.05 O 2 cathode, the salt rock phase with surface segregation could protect the cathode material from harmful reactions and improve the cycle stability. In 2019, Park [15] reported that 1 mol% W doping in LiNi 0.9 Co 0.05 Mn 0.05 O 2 cathode significantly improved the capacity retention from 60% to 89% after 500 cycles at a 4.3 V cutoff voltage. It was believed that the reason for the cathode performance improvement of the W-doped LiNi 0.9 Co 0.05 Mn 0.05 O 2 in the abovementioned reports was mainly due to the internal stress reduction to stabilize the bulk structure so that the formation of harmful microcracks was inhibited. Shang et al. [16] suggested that adding W stabilized the structure and slowed the diffusion of the rock salt phase from the surface to the interior. However, researchers have conflicting opinions on the effects of the formed rock salt structure after doping. For instance, concerning the abovementioned conflicting opinions, that is, Kim thinks the existence of rock salt phase is good, whereas Shang thinks it is bad. Furthermore, reports on the formation of the rock salt phase by non-W cation doping are controversial. Jianming Zheng et al. [17] believeThe rapid capacity degradation and poor rate capability hinder the application of Rich-Ni layered LiNi x Co y Mn z O 2 (NCM) as cathode materials for highenergy lithium-ion batteries. In this study, density functional theory (DFT) calculations, combined with conventional electrochemical measurements, reveal from the atomic view that the dual improvements in electronic and ionic conductivities are the main facts for the property enhancement. The bandgap of the cathode material is reduced to 1.1623 eV due to the increased number of electrons near the Fermi level after W intercalation. Such improved electronic conductivity subsequently lea...

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“…The peaks almost coincide with undoped TiO 2 depicting the presence of dopants has no in uence on anatase phase of TiO 2 calcined at 450 °C for 5 h [22]. This is may be due to the ionic radii of Zn 2+ (0.74 A°) and Mg 2+ (0.72 A°) are almost close to the ionic radii of Ti 4+ (0.75A°), hence more effective substitution of both the dopants into TiO 2 lattice has occurred by substituting Ti 4+ ions [10,13]. This can be further evident from the fact that no peaks at 2θ = 31.7, 34.5, 36.3, 47.5, 56.2 and 62.7° for ZnO and 2θ =36.7, 42.7 and 62.0° for MgO were observed [23,24].…”

Section: Xrdmentioning

confidence: 99%

“…Er and Mg co-doped TiO 2 were synthesized by Chen et al via facile hydrothermal synthesis and applicated for photovoltaic property in perovskite solar cell [12]. Among all the alkali earth metals Mg 2+ has proved to be a landmark dopant due to its ionic radius (0.72 A˚) similar to that of Ti 4+ [13]. Other expedient role of Mg containing TiO 2 is in reducing the band gap by forming an extra energy level just above the valency band by overlapping of 2p orbital of Mg 2+ and O 2− [14].…”

Section: Introductionmentioning

confidence: 99%

Biogenic surfactant mediated facile synthesis of visible light sensitized Zn/Mg co-doped TiO2 Nanomaterials– A Green approach: Evaluation of photocatalytic activity by degradation of Amido Black 10B

Tirukkovalluri

Jaishree

Divya

et al. 2022

Preprint

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Visible light driven Zn and Mg co-doped TiO2 nanomaterials were synthesized by varying dopant concentrations in presence of biogenic surfactant Sapindus emerginatus biogenic extract via Solgel method and has been successfully applicated to the degradation of Amido Black 10B, an exemplary anionic textile azo dye pollutant. In this study, explored the potent capping properties of biogenic extract surfactant by encapsulating the Zn/Mg co-doped TiO2. In a view to assess the physical and optical properties of as synthesized catalyst, various advanced instrumental techniques were adopted. The Transmission Electron Microscopy and Scanning Electron Microscopy analysis shows the formation of small particle size (6.92 nm) and rough surface respectively pertaining to ZMT4S2. The substitutional doping of Zn and Mg into TiO2 framework by substituting Ti4+ ion and the encapsulation of surfactant around catalyst was confirmed by Fourier Transform-Infrared Spectroscopy (FTIR) spectral studies. The surface area of the ZMT4S2 was found to be high (195.20 m2 g−1) as compared with undoped TiO2 (32.50 m2 g−1) and ZMT4 (7.02 m2 g−1). The red shift in the absorbance was observed for all the catalysts analyzed using UV-DRS making them active in visible region with maximum shift corresponds to a band energy difference of 2.1 eV for ZMT4S2. The sensitivity of the catalyst towards visible light was confirmed by its band gap energy measurement using UV-vis DRS. The anatase phase of all the catalysts were confirmed using Powder X-ray diffraction. The composition and wt% of dopants revealed the EDX spectra agrees well with the calculated value. The slightly shifted frequency bands (FTIR) further confirmed the doping of Zn and Mg. The characterization analysis reports further accounts for the effective degradation of AB10B dye (99%) taking place within 20 min of irradiation time at optimized reaction parameters such as best dopant concentration ZMT4, catalyst dosage (100 mgL−1), dye concentration (10 mgL−1) and solution pH 3.

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Enhanced electrochemical properties of Ni-rich layered cathode materials via Mg2+ and Ti4+ co-doping for lithium-ion batteries

Cited by 79 publications

References 43 publications

Concentration-Gradient LiNi_0.85Co_0.12Al_0.03O₂ Cathode Assembled with Primary Particles for Rechargeable Lithium-Ion Batteries

Concentration-Gradient LiNi_0.85Co_0.12Al_0.03O₂ Cathode Assembled with Primary Particles for Rechargeable Lithium-Ion Batteries

Atomic Horizons Interpretation on Enhancing Electrochemical Performance of Ni‐Rich NCM Cathode via W Doping: Dual Improvements in Electronic and Ionic Conductivities from DFT Calculations and Experimental Confirmation

Biogenic surfactant mediated facile synthesis of visible light sensitized Zn/Mg co-doped TiO2 Nanomaterials– A Green approach: Evaluation of photocatalytic activity by degradation of Amido Black 10B

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Enhanced electrochemical properties of Ni-rich layered cathode materials via Mg2+ and Ti4+ co-doping for lithium-ion batteries

Cited by 79 publications

References 43 publications

Concentration-Gradient LiNi0.85Co0.12Al0.03O2 Cathode Assembled with Primary Particles for Rechargeable Lithium-Ion Batteries

Concentration-Gradient LiNi0.85Co0.12Al0.03O2 Cathode Assembled with Primary Particles for Rechargeable Lithium-Ion Batteries

Atomic Horizons Interpretation on Enhancing Electrochemical Performance of Ni‐Rich NCM Cathode via W Doping: Dual Improvements in Electronic and Ionic Conductivities from DFT Calculations and Experimental Confirmation

Biogenic surfactant mediated facile synthesis of visible light sensitized Zn/Mg co-doped TiO2 Nanomaterials– A Green approach: Evaluation of photocatalytic activity by degradation of Amido Black 10B

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Concentration-Gradient LiNi_0.85Co_0.12Al_0.03O₂ Cathode Assembled with Primary Particles for Rechargeable Lithium-Ion Batteries

Concentration-Gradient LiNi_0.85Co_0.12Al_0.03O₂ Cathode Assembled with Primary Particles for Rechargeable Lithium-Ion Batteries