Nitrogen-doped graphene guided formation of monodisperse microspheres of LiFePO<sub>4</sub> nanoplates as the positive electrode material of lithium-ion batteries

Zhou, Yingke; Lu, Jiming; Deng, Chengji; Zhu, Hui; Zhang, Shaowei; Tian, Xiaohui

doi:10.1039/c6ta03440c

Cited by 86 publications

(33 citation statements)

References 43 publications

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“…The good electronic and ionic kinetics of LiFePO 4 @C/rGO were further supported by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) analyses (Figures S18 and S19, respectively, in the Supporting Information). The material was found to exhibit a higher rate capability than those of the LiFePO 4 /C microspherical samples reported in the literature (shown in Figure S20 in the Supporting Information) . Although the performance of LiFePO 4 @C/rGO at higher rates (>10 C) was slightly lower than that of nanosized LiFePO 4 /C reported previously, the LiFePO 4 @C/rGO material achieved a tap density of 1.3 g cm −3 , which was almost 30 % higher than that currently reported for carbon‐coated irregular LiFePO 4 nanomaterials (≤1.0 g cm −3 ), and thus, better for volumetric energy density.…”

Section: Resultsmentioning

confidence: 60%

Self‐Assembly of Antisite Defectless nano‐LiFePO₄@C/Reduced Graphene Oxide Microspheres for High‐Performance Lithium‐Ion Batteries

et al. 2018

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LiFePO @C/reduced graphene oxide (rGO) hierarchical microspheres with superior electrochemical activity and a high tap density were first synthesized by using a Fe -based single inorganic precursor (LiFePO OH@RF/GO; RF=resorcinol-formaldehyde, GO=graphene oxide) obtained from a template-free self-assembly synthesis followed by direct calcination. The synthetic process requires no physical mixing step. The phase transformation pathway from tavorite LiFePO OH to olivine LiFePO upon calcination was determined by means of the in situ high-temperature XRD technique. Benefitting from the unique structure of the material, these microspheres can be densely packed together, giving a high tap density of 1.3 g cm , and simultaneously, defectless LiFePO primary nanocrystals modified with a highly conductive surface carbon layer and ultrathin rGO provide good electronic and ionic kinetics for fast electron/Li ion transport.

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Section: Resultsmentioning

confidence: 60%

Self‐Assembly of Antisite Defectless nano‐LiFePO₄@C/Reduced Graphene Oxide Microspheres for High‐Performance Lithium‐Ion Batteries

et al. 2018

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“…The increase in the energy consumption and global warming has accelerated research on electrochemical energy storage devices for electric vehicles and electronic equipment [1][2][3][4][5][6]. Lithium-sulfur batteries are promising energy storage devices due to their high theoretical energy density (2600 Wh/kg) and specific capacity, natural abundance, low cost, and safety [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

A Co9S8 microsphere and N-doped carbon nanotube composite host material for lithium-sulfur batteries

Angulakshmi

Zhang

et al. 2020

Journal of Alloys and Compounds

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Lithium-sulfur batteries have emerged as extraordinarily favorable energy storage devices due to their high specific capacity and energy density, safety and low cost. Unfortunately, the wide applications of lithium-sulfur batteries are hampered by several issues, such as the low electronic conductivity and slow redox kinetics, serious volumetric expansion and polysulfide "shuttle effect". To overcome these issues, in our work, we design and synthesize a composite sulfur host material of Co9S8 microspheres and N-doped carbon nanotubes, where the metallic sulfide Co9S8 with a good conductivity enables the immobilization of the polar lithium polysulfides owing to the strong polar chemisorptive capability, and the one dimensional N-doped carbon nanotubes can provide channels for fast electron and lithium-ion transport. As the lithium polysulfides are well confined, and the redox conversions are promoted, the Co9S8@N-CNTs/S-based lithium-sulfur battery possesses a superior energy storage performance, exhibiting a large specific capacity of 1233 mAh g -1 at 0.1 C and an outstanding cyclic performance, with a low decay of 0.045% per cycle and a Coulombic efficiency of more than 99% after 1000 cycles. Keywords: Metal sulfides; N-doped carbon nanotube; Cathode material; Lithium-sulfur battery. tightly attached to the N-CNTs is formed. In this composite, the polar metal sulfide Co9S8 enables a superior lithium polysulfide absorptivity via the polar chemical bond, which decreases polysulfide dissolution and the shuttle effect and increases the specific capacity and cyclic performance, while the N-doped carbon nanotubes can assist to increase the electronic conductivity and enlarge the interface between the electrode and electrolyte to further enhance the rate performance. Meanwhile, the N-CNTs/S composite and the Co9S8@N-CNTs/S composites with different contents of N-CNTs have been studied and compared. The unique Co9S8@N-CNTs composite-based sulfur cathode displays an outstanding overall electrochemical performance, making it promising for applications in 6 lithium-sulfur batteries. Experimental Preparation of Co9S8 and Co9S8@N-CNTsThe Co9S8@N-CNTs composite host was prepared using a solvothermal process. First, 27 mg of the N-CNTs was ultrasonically dispersed into 30 mL of ethylene glycol and 10 mL of distilled water to form a suspension. CoCl2· 6H2O (0.7138 g) and thiourea (0.4567 g) were added with stirring, and the ratio of CoCl2:thiourea was fixed as 60:40. The obtained solution was then subjected to a hydrothermal reaction for 12 h at 180 C. The product was filtered, adequately washed, and vacuum-dried for 24 h at 80 C. The obtained precursor was annealed for 3 h at 500 °C in H2/Ar (10%:90%). The obtained sample is denoted as Co9S8@N-CNTs. The pristine Co9S8 material was also prepared using the same processes but without adding the N-CNTs. The other Co9S8@N-CNTs composites with different contents of N-CNTs (13.5 mg and 40.5 mg) were prepared by a similar procedure. Hereafter, these obtained samples with different N...

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“…[7][8][9][10] Rather than the planar large area foil current collectorbased electrodes used commercially, investigations of 3D electrode morphologies at the laboratory scale have also shown that faster ionic and electronic transport can be promoted, which supports faster charging and/or discharging performance. [11][12][13][14][15][16][17][18] However, these approaches are difficult to scale-up economically.…”

Section: Introductionmentioning

confidence: 99%

Co-spray printing of LiFePO₄ and PEO-Li_1.5Al_0.5Ge_1.5(PO₄)₃ hybrid electrodes for all-solid-state Li-ion battery applications

Leung

Huang

et al. 2019

J. Mater. Chem. A

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Nitrogen-doped graphene guided formation of monodisperse microspheres of LiFePO₄ nanoplates as the positive electrode material of lithium-ion batteries

Abstract: Three-dimensional porous composite microspheres of LiFePO4 and nitrogen-doped graphene have been synthesized by a solvothermal process coupled with subsequent calcination.

Cited by 86 publications

References 43 publications

Self‐Assembly of Antisite Defectless nano‐LiFePO₄@C/Reduced Graphene Oxide Microspheres for High‐Performance Lithium‐Ion Batteries

Self‐Assembly of Antisite Defectless nano‐LiFePO₄@C/Reduced Graphene Oxide Microspheres for High‐Performance Lithium‐Ion Batteries

A Co9S8 microsphere and N-doped carbon nanotube composite host material for lithium-sulfur batteries

Co-spray printing of LiFePO₄ and PEO-Li_1.5Al_0.5Ge_1.5(PO₄)₃ hybrid electrodes for all-solid-state Li-ion battery applications

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Nitrogen-doped graphene guided formation of monodisperse microspheres of LiFePO4 nanoplates as the positive electrode material of lithium-ion batteries

Abstract: Three-dimensional porous composite microspheres of LiFePO4 and nitrogen-doped graphene have been synthesized by a solvothermal process coupled with subsequent calcination.

Cited by 86 publications

References 43 publications

Self‐Assembly of Antisite Defectless nano‐LiFePO4@C/Reduced Graphene Oxide Microspheres for High‐Performance Lithium‐Ion Batteries

Self‐Assembly of Antisite Defectless nano‐LiFePO4@C/Reduced Graphene Oxide Microspheres for High‐Performance Lithium‐Ion Batteries

A Co9S8 microsphere and N-doped carbon nanotube composite host material for lithium-sulfur batteries

Co-spray printing of LiFePO4 and PEO-Li1.5Al0.5Ge1.5(PO4)3 hybrid electrodes for all-solid-state Li-ion battery applications

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Nitrogen-doped graphene guided formation of monodisperse microspheres of LiFePO₄ nanoplates as the positive electrode material of lithium-ion batteries

Self‐Assembly of Antisite Defectless nano‐LiFePO₄@C/Reduced Graphene Oxide Microspheres for High‐Performance Lithium‐Ion Batteries

Self‐Assembly of Antisite Defectless nano‐LiFePO₄@C/Reduced Graphene Oxide Microspheres for High‐Performance Lithium‐Ion Batteries

Co-spray printing of LiFePO₄ and PEO-Li_1.5Al_0.5Ge_1.5(PO₄)₃ hybrid electrodes for all-solid-state Li-ion battery applications