Depolarization effects of Li2FeSiO4 nanocrystals wrapped in different conductive carbon networks as cathodes for high performance lithium-ion batteries

Wang, Kai; Ren, Wenju; Yang, Jinlong; Tan, Rui; Liu, Yidong; Pan, Feng

doi:10.1039/c6ra07755b

Cited by 19 publications

(7 citation statements)

References 35 publications

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“…based materials, being attributed to electrolyte decomposition, possible irreversible electrode reduction, and inevitable SEI formation. [19,20,34] There are two voltage plateaus observed in Figure 3a at 2.0 V and 4.3 V in the C/DC profile, confirming a multi-step electrochemical reaction as reported elsewhere. [19,25] After the activation step, the NFSO-C/Na + cell exhibits a discharge capacity of 105 mAh g -1 at 0.25 C. The discharge capacities realized from the NFSO-C/Na + cell surpasses many reported values on NFSO.…”

Section: Accepted Manuscriptsupporting

confidence: 87%

“…The XPS spectrum of Si 2p (Figure 2d) and O 1s (Figure 2e) have corresponding peaks at 531.5 eV and 101.9 eV, respectively. [34] The de-convoluted C 1s spectrum in Figure 2f exhibits characteristic peaks at 283.5 eV, 285.4 eV, 286.6 eV, 288.2 eV, and 289.3 eV, which are assigned to the sp 2 carbon, C-OH, epoxy, C=O, and π-π* functionalities, respectively. [31,32] These small oxygencontaining functionalities are crucial to ensure long-term electrochemical cycling.…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

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Facile solid-state synthesis of eco-friendly sodium iron silicate with exceptional sodium storage behaviour

Karthikeyan

Chen

2018

Electrochimica Acta

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It is crucial to develop stable energy sources for rechargeable sodium-ion batteries using simple synthesis methods. Herein, we report a facile route for synthesizing phase-pure carboncoated Na 2 FeSiO 4 polyanionic cathodes using conventional solid-state methods at 700 °C under inert atmosphere. X-ray diffraction results reveal that there are no impurities in the highly crystalline Na 2 FeSiO 4 particles, resulting from the heat of combustion provided by the organic chelating agent. The electrochemical behaviour of Na 2 FeSiO 4 particles is tested within 1.5-4.5 V at 0.25 C. The Na 2 FeSiO 4 cathode delivered 119 mAh g -1 at 0.25 C and maintained ~ 85 % of its initial capacity after 200 cycles after activation process. Even at high current densities of 3.5 C, the material outperforms other orthosilicates-based cathodes reported with capacities of 55 mAh g -1 discharge capacity along with ~ 80% retention after 1,000 cycles. The enhanced performance of carbon-coated Na 2 FeSiO 4 particles is ascribed to the improved electronic conductivity by the incorporation of carbon and the presence of void space between the particles. This void space contains more electrolytes and eliminates the stress formed during the cycling process, thus improving stability even at high rates. This is the first report on obtaining phase pure metal orthosilicate material with negligible impurities using simple solid-state method along with such exponential electrochemical performances.

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Section: Accepted Manuscriptsupporting

confidence: 87%

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

Facile solid-state synthesis of eco-friendly sodium iron silicate with exceptional sodium storage behaviour

Karthikeyan

Chen

2018

Electrochimica Acta

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“…Graphene silicate composites are one of the rarely explored composites as cathode for LIBs. Among graphene silicate composites, the most widely are is Li2FeSiO4 [95,104], Li2MnSiO4 [105], and Li2VSi2O6 [106], etc. Li2FeSiO4 is also abbreviated as LFS and is widely explored among silicate cathodes owing to its theoretical capacity of 332 mAh g −1 which accommodates two lithium ions in the lattice [95].…”

Section: Graphene/silicate Composites As Cathodes For Libsmentioning

confidence: 99%

Graphene: Chemistry and Applications for Lithium-Ion Batteries

et al. 2022

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In the present era, different allotropes of carbon have been discovered, and graphene is the one among them that has contributed to many breakthroughs in research. It has been considered a promising candidate in the research and academic fields, as well as in industries, over the last decade. It has many properties to be explored, such as an enhanced specific surface area and beneficial thermal and electrical conductivities. Graphene is arranged as a 2D structure by organizing sp2 hybridized C with alternative single and double bonds, providing an extended conjugation combining hexagonal ring structures to form a honeycomb structure. The precious structure and outstanding characteristics are the major reason that modern industry relies heavily on graphene, and it is predominantly applied in electronic devices. Nowadays, lithium-ion batteries (LIBs) foremostly utilize graphene as an anode or a cathode, and are combined with polymers to use them as polymer electrolytes. After three decades of commercialization of the lithium-ion battery, it still leads in consumer electronic society due to its higher energy density, wider operating voltages, low self-discharge, noble high-temperature performance, and fewer maintenance requirements. In this review, we aim to give a brief review of the domination of graphene and its applications in LIBs.

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“…The carbon coating strategy through the use of carbon shells, carbon nanofibers, or carbon nanotubes can improve the sluggish Li ? ion diffusion, rate capability through the increment of surface electronic conductivity, and formation of a stable solid electrolyte interface (SEI) to protect cathode material [12][13][14]. Recently, Li 2 FeSiO 4 composited with graphene attracts much attention due to the high mechanical and electronic properties and high specific capacity of graphene during charge/ discharge processes [8].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and electrochemical characterization of F- and Cl-doped Li2FeSiO4 cathode material for lithium-ion battery

Tahertalari

Massoudi

et al. 2021

J Mater Sci: Mater Electron

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As a high-capacity cathode material with a considerable cycle life, lithium metal orthosilicates have attracted much attention. In this paper, Li 2 FeSiO 4 , Li 2-FeSiO 4-x Cl x and Li 2 FeSiO 4-x F x are successfully synthesized via solid-state method. Li 2 FeSiO 4-x F x is also composited with reduced graphene oxide (rGO). The X-ray diffraction patterns show 0.2% expansion in the lattice volume of Li 2 FeSiO 4-x F x and 0.7% shrinkage for Li 2 FeSiO 4-x Cl x due to the doping effect. Fourier-transform infrared spectroscopy also indicates a frequency shift for [SiO 4 ] 4and [LiO 4 ] functional groups due to ion doping. The SEM images confirm that rGO surrounded Li 2 FeSiO 4-x F x microparticles. The electrochemical performance illustrates a reversible ox/red reaction of Fe 2? /Fe 3? couple at the potential of 3/2.6 V for Li 2 FeSiO 4 , 3.5/2.9 V for Li 2 FeSiO 4-x F x , and 3.3/2.3 V for Li 2 FeSiO 4-x Cl x . Lithiation curves at 0.05C rate show the first specific capacity of 168 mAh g -1 for Li 2 FeSiO 4 with 84% retention after 25th cycles, 190 mAh g -1 for Li 2 FeSiO 4-x F x with 100% retention, and 120 mAh g -1 for Li 2 FeSiO 4-x Cl x with 73% retention. Li 2 FeSiO 4-x F x /rGO cathode delivers 265 mAh g -1 with 88% retention after 25th cycles.

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Depolarization effects of Li₂FeSiO₄ nanocrystals wrapped in different conductive carbon networks as cathodes for high performance lithium-ion batteries

Abstract: We report composite electrodes with Li2FeSiO4 nanocrystals wrapped in three different types of conductive carbon, Acetylene Black, carbon nanotubes and Ketjen Black, to demonstrate depolarization effects on the electrochemical performance of Li-ion batteries.

Cited by 19 publications

References 35 publications

Facile solid-state synthesis of eco-friendly sodium iron silicate with exceptional sodium storage behaviour

Facile solid-state synthesis of eco-friendly sodium iron silicate with exceptional sodium storage behaviour

Graphene: Chemistry and Applications for Lithium-Ion Batteries

Synthesis and electrochemical characterization of F- and Cl-doped Li2FeSiO4 cathode material for lithium-ion battery

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