Energy Accumulation Enabling Fast Synthesis of Intercalated Graphite and Operando Decoupling for Lithium Storage

Wang, Zhao; Yu, Chang; Huang, Hongtao; Guo, Wei; Ren, Weicheng; Xie, Yuanyang; Qiu, Jieshan

doi:10.1002/adfm.202009801

Cited by 11 publications

(12 citation statements)

References 42 publications

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“…However, for MMC-2/Se, the I D /I G ratio was 0.99; this reflects the formation of increased long-range ordered graphite layers in carbon, promoted by Fe nanoparticles that catalyze graphitization. 59,62 The presence of a distinct 2D peak at ~2700 cm À1 also verifies the formation of a graphitic structure in carbon, 59,63 which is in close agreement with the XRD results in Figure 3A,B. MesoC/Se exhibited a considerably lower I D /I G ratio (0.90) and intensified 2D peaks; this confirms the substantially reduced amount of amorphous carbon in MesoC after oxidation of MMC-2, as discussed earlier.…”

Section: Resultssupporting

confidence: 88%

Deliberate introduction of mesopores into microporous activated carbon toward efficient Se cathode of Na−Se batteries

Kim

Kang

2021

Intl J of Energy Research

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Sodium-selenium (NaÀSe) batteries are garnering increasing attention as promising energy storage systems because of the low cost of Na resources and the high volumetric capacity of Se. Nevertheless, their practical application is hindered by the low utilization rate of Se and the shuttle effect of polyselenide, which lead to unstable cycling performance. Therefore, extensive efforts are necessary to develop suitable carbon-based Se hosts. Here, we propose a simple method to introduce a controlled amount of mesopores into microporous carbon, which can remarkably improve the electrochemical performance of NaÀSe batteries. The Se encapsulated in the optimized micro-mesoporous carbon exhibited a substantially improved cycling stability, with a capacity of 572 mA h g À1 at 0.5C after 150 cycles, which represents a 93% capacity retention from the second cycle. In addition, the Se could achieve a high reversible capacity of 214 mA h g À1 , even at 20C. The results of this study provide guidance for distinguishing the roles of the micropores and mesopores of carbon in the Se host of NaÀSe batteries: (a) Micropores are ideal reservoirs to confine Se in an amorphous form for stable electrochemical reactions with Na, and (b) mesopores provide pathways for Na + ion diffusion and a buffer for the volume change of Se. The proposed method would be widely applicable to other types of microporous carbon with much higher specific surface areas, which can afford higher Se loading for more advanced alkali metalÀSe batteries.

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Section: Resultssupporting

confidence: 88%

Deliberate introduction of mesopores into microporous activated carbon toward efficient Se cathode of Na−Se batteries

Kim

Kang

2021

Intl J of Energy Research

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“…[ 11 ] Meanwhile, there is also a red shift for the G peak, from about 1600 (@3 V) to 1565 cm −1 (@0.01 V), primarily because of the electron doping originating from the charge transfer between the Na + intercalated into the stacked carbon sheets and the carbon π* antibonding orbital, [ 41 ] which was already reported in that of the graphite intercalation compounds of alkali metal. [ 42 ] The I D / I G value, reflecting the defect/disorder to a certain extent, slightly increases during the sodiation, which can be relevant to the SEI formation on the electrode surface (Figure 5d). After the full desodiation, the D and G peaks move back to the initial peak position, with a negligible fluctuation of I D / I G value, indicating the excellent stability and reversibility of Na storage in the LHCE system.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Anion‐Derived Inorganic‐Dominated Solid Electrolyte Interphases for High‐Rate and Stable Sodium Storage

Ren

et al. 2023

Energy & Environ Materials

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It is highly desirable for the promising sodium storage possessing high rate and long stable capability, which are mainly hindered by the unstable yet conventional solvent‐derived organic‐rich solid electrolyte interphases. Herein, an electrolyte solvation chemistry is elaborately manipulated to produce an enhanced anion‐derived and inorganic components‐dominated solid electrolyte interphases by introducing a low permittivity (4.33) bis(2,2,2‐trifluoroethyl) ether diluent into the sodium bis(trifluoromethylsulfonyl)imide‐dimethoxyethane‐based high concentration electrolyte to obtain a localized high concentration electrolyte. The bis(2,2,2‐trifluoroethyl) ether breaks the balance of original cation solvation structure and tends to interact with Na+‐coordinated dimethoxyethane solvent rather than Na+ in high concentration electrolyte, leaving an enhanced Coulombic interaction between Na+ and (FSO2)2N−, and more (FSO2)2N− can enter the Na+ solvation shell, forming a further increased number of Na+‐(FSO2)2N−‐dimethoxyethane clusters (from 82.0% for high concentration electrolyte to 94.3% for localized high concentration electrolyte) at a low salt dosage. The preferential reduction of this (FSO2)2N−‐enriched clusters rather than the dimethoxyethane‐dominated Na+ solvation structure produces an enhanced anion‐derived and inorganic components‐dominated solid electrolyte interphases. The reversible charge storage process of Na is decoupled by operando Raman along with a shift of D and G peaks. Benefiting from the enhanced anion‐derived electrode‐electrolyte interface, the commercial hard carbon anode in localized high concentration electrolyte shows a well rate capability (5 A g−1, 70 mAh g−1), cycle performance and stability (85% of initial capacity after 700 cycles) in comparison to that of high concentration electrolyte (68%) and low concentration electrolyte (only 5% after 400 cycles), indicative of uniqueness and superiorities towards stable Na storage.

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“…Secondary batteries are considered to be very promising energy storage devices because of their high energy density, long life, and low self-discharge rate . To promote the development of the smart grid and future grid, the secondary batteries are expected to fully exhibit their advantages/superiorities and to be widely applied . Two-dimension (2D) graphene with a multihole structure will provide a huge charge storage capacity, and the large space and good conductive frameworks within the graphene will promote ion transport and electron transfer.…”

Section: Multilevel Applications For Eeg In Energy Fieldsmentioning

confidence: 99%

Electric-Field-Triggered Graphene Production: From Fundamental Energy Applications to Perspectives

Tan

et al. 2022

Acc. Mater. Res.

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Metrics & MoreArticle Recommendations CONSPECTUS: Two-dimensional sp 2 -hybridized graphene has been seriously considered and applied in various fields, such as materials science, energy storage/conversion, catalysis, and biomedicine, on account of its unique long-range-ordered and π-conjugated structure as well as excellent thermal and electric conductivity. At present, the adopted methods for graphene synthesis cover micromechanical exfoliation, epitaxial growth, chemical reduction of graphite oxide, chemical vapor deposition, and liquid-phase exfoliation. Nonetheless, a number of issues and challenges still existed in these employed methods in terms of sustainable and green energy chemistry and environmental friendliness. Electrochemical exfoliation is one of the most promising methods for the large-scale production of graphene by virtue of simple/eco-friendly operation and high-efficiency production. Depending on different exfoliation methods (anodic, cathodic, and dual-electrode) and electrochemical exfoliation conditions such as the reaction device, raw material, electrolyte, and power-supply mode, the exfoliated graphene features various and versatile characteristics. The relatively perfect graphene with intrinsic long-range πconjugated character is accompanied by the fast capability of electron transfer. The defective graphene features the adjustable size and defect density and tunable amphipathicity. As a result, the corresponding graphene has been employed in energy storage/ conversion, biology, and medicine fields. In this Account, we summarize the recent progress in the fundamentals of electrochemical exfoliation to produce the graphene and the derivative exfoliation method and their applications in energy-related fields, and the corresponding perspectives are also highlighted. First, we describe the fundamentals for different exfoliation methods and electricfield-induced effects that can help to guide us to prepare and produce graphene with various properties, covering the size, defect density, and surface chemistry. Subsequently, three electric-field-triggered methods (anodic, cathodic, and dual-electrode exfoliation) are discussed in detail. In particular, the effects of various electrolytes and power-supply modes on electrochemically exfoliated graphene (EEG) are systematically underlined in terms of the exfoliation principles and process, which are the significant factors affecting the structure and properties of EEG and the efficiency of intercalation and exfoliation. In addition, the recent progress in multilevel applications of EEG in energy storage/conversion fields such as supercapacitors, secondary batteries, the oxygen evolution reaction, the hydrogen evolution reaction, the carbon dioxide reduction reaction, and so forth is also summarized. Finally, the expectations and future research directions for the EEG in terms of controllably technological parameters and conditions, precise monitoring and in-depth comprehension of the exfoliation processes, multiscale and diverse products (carbon q...

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Energy Accumulation Enabling Fast Synthesis of Intercalated Graphite and Operando Decoupling for Lithium Storage

Cited by 11 publications

References 42 publications

Deliberate introduction of mesopores into microporous activated carbon toward efficient Se cathode of Na−Se batteries

Deliberate introduction of mesopores into microporous activated carbon toward efficient Se cathode of Na−Se batteries

Enhanced Anion‐Derived Inorganic‐Dominated Solid Electrolyte Interphases for High‐Rate and Stable Sodium Storage

Electric-Field-Triggered Graphene Production: From Fundamental Energy Applications to Perspectives

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