Operando Structural and Electrochemical Investigation of Li1.5V3O8 Nanorods in Li-ion Batteries

Partheeban, Thamodaran; Kesavan, Thangaian; Vivekanantha, Murugan; Senthilkumar, Baskar; Barpanda, Prabeer; Sasidharan, Manickam

doi:10.1021/acsaem.8b01915

Cited by 8 publications

(5 citation statements)

References 46 publications

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“…Moreover, the increased regions at ∼516 eV were disclosed, revealing the increase of the V 4+ content. After fitting V 5+ and V 4+ , the V 4+ /V 5+ ratio of LVOB-2 could reach up to 37.5%, larger than that of LVO-P (27.2%), indicating the formation of more oxygen defects, which is beneficial for improving the ion-storage capacities. ,, For the analysis of the O 1s high-resolution spectra, three XPS peaks could be fitted. Among them, the peaks at 530.1 and 531.4 eV were associated with O 2– and the surface, and that at 532.7 eV was related to oxygen defects.…”

Section: Resultsmentioning

confidence: 99%

Tailoring Oxygen Site Defects of Vanadium-Based Materials through Bromine Anion Doping for Advanced Energy Storage

Yuan

Zhao

et al. 2021

ACS Appl. Energy Mater.

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Captivated by their strong ion-storage capacities, vanadium (V)-based cathode materials have triggered plenty of active research. However, these materials still suffer from unstable lattice structures, always accompanied by inferior rate capabilities. Herein, with the introduction of bromine ions, the oriented growth was tailored to form smaller rod-like particles, while the resultant charge unbalance brought about the creation of oxygen defects, boosting the broadening of energy distribution with fast redox reactions. The as-targeted sample displayed a lithium ion storage capacity of 280 mA h g–1, which was still maintained at about 252 mA h g–1 after several cycles. As zinc-ion battery cathodes, a capacity of 247 mA h g–1 could be retained at 0.5 A g–1 after 100 cycles. Even at a high current density of 3.0 A g–1, the capacity was retained at about 207 mA h g–1 after 500 cycles. Supported by a series of advanced technologies, the enhanced redox activity of V ions was detected owing to the unbalance of charge from bromine doping. Moreover, a detailed kinetic analysis and in situ resistance measurements further demonstrated the enhancement of surface-controlling contributions and in-depth redox reactions. Given that, this work was anticipated to offer a significant perspective about rational surface-/interface-enhanced properties of advanced energy-storage materials.

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Section: Resultsmentioning

confidence: 99%

Tailoring Oxygen Site Defects of Vanadium-Based Materials through Bromine Anion Doping for Advanced Energy Storage

Yuan

Zhao

et al. 2021

ACS Appl. Energy Mater.

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“…Relationship between peak current i p and square root of sweep rate v 1/2 of the NVO(3K) electrode (c). Na-diffusion coefficients of the NVO(0K), NVO(1K), NVO(3K) and NVO(5K) electrodes at the four peak positions (d) Na ＋在较高电位(D 2 )下嵌入四面体位置, 在较低电位 (D 1 )下嵌入八面体位置 [48] . 在首次嵌钠过程中, 由于开路电位(图 S4)在 3.0 V 以下, Na ＋只能嵌入能级低的八面体位置, 能级高的四面体位置被空置, 导致首次放电容量低和电压平台低的现象(图 4a, 4b).…”

Section: 引言unclassified

Effect of K-Doping on the Sodium-storage Performance of Sodium Vanadate Nanoplates

Song¹,

Li²,

Li³

et al. 2019

Acta Chim. Sinica

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Na-ion batteries with lower cost than Li-ion batteries would be developed to large-scale energy-storage device to store solar and wind energies. However, large radius renders Na ＋ ions to insert into/extract out the layered transition metal oxides (LTMOs) sluggishly. To improve the intercalation dynamics of Na ＋ ions, the interlayer spacing of crystals has to be expanded for those LTMOs that are capable of fast lithiation and delithiation. Herein, a LTMO based on vanadium is firstly doped with larger K ＋ ions to expand the interlayer spacing to yield K ＋-doped sodium vanadate (Na 5 K x V 12 O 32) cathode material by a hydrothermal method at 200 ℃ for 24 h followed by calcination at 500 ℃ for 3 h. The samples were characterized by scanning electron microscope (SEM)/transmission electron microscope (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) technologies. Effect of the doping amount of K ＋ on the structure and sodium-storage performance of the sample was studied in detail. The synthesized materials display nanoplate morphology viewing from the TEM images. K ＋ ions are doped into the interlayer of the sodium vanadate crystallites, which is proved by analysis of the XRD patterns and XPS spectra. Expanded interlayer spacing favors Na ＋ ions' intercalation and deintercalation between the [V 3 O 8 ] layers, which is testified by the chemical diffusion coefficient of cathodes, thus enhancing the rate capability. On the other hand, the chemically pre-intercalated K ＋ ions are pinned in the crystallites during insertion and extraction of Na ＋ ions and act as pillars to stabilize the layered structure, improving the cycliability of the cathode. However, excessive doping of K ＋ leads to a discounted rate capability of the cathode, suggesting an optimized amount of K ＋ doping into the crystal. The results from galvanostatic charge-discharge tests indicate that the obtained NVO(3K) sample, in which 0.118 mol of K ＋ ions are doped into per mol of Na 5 V 12 O 32 , presents the best electrochemical performance among the various samples. It can deliver the maximum capacities of 169, 160, 148, 132, 98 and 69 mAh•g-1 at the rates of 0.1C, 0.2C, 0.5C, 1C, 3C and 10C after activated for several times over the voltage window of 4.0～1.5 V (vs. Na ＋ /Na), respectively. Even run at

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“…Exclusively, Li-ion batteries are one the most promising solutions owing to their outstanding electrochemical performance [8]. Li-ion batteries comprise a separator [9], electrolyte [10], anode [11], and cathode [12]. Within this, the electrochemical performance and capacity of the battery are highly dependent on the choice of cathode materials.…”

Section: Introductionmentioning

confidence: 99%

Eggshell-Membrane-Derived Carbon Coated on Li2FeSiO4 Cathode Material for Li-Ion Batteries

et al. 2020

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Lithium iron orthosilicate (LFS) cathode can be prepared via the polyol-assisted ball milling method with the incorporation of carbon derived from eggshell membrane (ESM) for improving inherent poor electronic conduction. The powder X-ray diffraction (XRD) pattern confirmed the diffraction peaks without any presence of further impure phase. Overall, 9 wt.% of carbon was loaded on the LFS, which was identified using thermogravimetric analysis. The nature of carbon was described using parameters such as monolayer, and average surface area was 53.5 and 24 m 2 g −1 with the aid of Langmuir and Brunauer-Emmett-Teller (BET) surface area respectively. The binding energy was observed at 285.66 eV for C-N owing to the nitrogen content in eggshell membrane, which provides more charge carriers for conduction. Transmission electron microscopy (TEM) images clearly show the carbon coating on the LFS, the porous nature of carbon, and the atom arrangements. From the cyclic voltammetry (CV) curve, the ratio of the anodic to the cathodic peak current was calculated as 1.03, which reveals that the materials possess good reversibility. Due to the reversibility of the redox mechanism, the material exhibits discharge specific capacity of 194 mAh g −1 for the first cycle, with capacity retention and an average coulombic efficiency of 94.7% and 98.5% up to 50 cycles.Energies 2020, 13, 786 2 of 13 iron silicate (Li 2 FeSiO 4 ) arrived in 2005 with the theoretical capacity twice the time of LiFePO 4 . It is also a safer and environmentally benign cathode material for energy storage applications [17]. Physical and electrochemical factors such as structural imperfection, ion diffusion, and low electronic conduction inhibit the utilization of theoretical capacity [18]. The inherent poor electronic conduction and ionic diffusion must be resolved by adopting some approaches such as particle size reduction [19], metal doping [20], and carbon coating on the surface of LFS [21]. The reduced particle size of LFS paved a way to shorten the Li + diffusion path. Hence, nanosized materials are still emerging in Li-ion batteries [22]. Cation doping is an effective strategy for widening the Li + diffusion channel and increases the output voltage of LFS-based Li-ion batteries [23]. Carbon coating is another effective approach to improve the electronic conductivity of cathodes made from Li 2 FeSiO 4 . Not only does it display excellent conduction behavior, carbon established an ideal matrix for cathode LFS which is due to the high dispersal over the surface. Besides, carbon coating prevents the decomposition of the electrolyte and integrates the particles within the volume. In this LFS, different carbon sources have been used to enhance the conductivity of LFS [24]. In the sol-gel method, sorbitanlaurat was used as carbon source by Qu et al. [25] and obtained the specific discharge capacity of 187 mAh g −1 at 0.1 C. Yen et al. [26] reveals that carbon derived from L-ascorbic acid on LFS exhibits the capacity of 137 mAh g −1 at slow rate (C/16). The biolo...

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Operando Structural and Electrochemical Investigation of Li_1.5V₃O₈ Nanorods in Li-ion Batteries

Cited by 8 publications

References 46 publications

Tailoring Oxygen Site Defects of Vanadium-Based Materials through Bromine Anion Doping for Advanced Energy Storage

Tailoring Oxygen Site Defects of Vanadium-Based Materials through Bromine Anion Doping for Advanced Energy Storage

Effect of K-Doping on the Sodium-storage Performance of Sodium Vanadate Nanoplates

Eggshell-Membrane-Derived Carbon Coated on Li2FeSiO4 Cathode Material for Li-Ion Batteries

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