Difluoro(oxalato)borate anion intercalation into graphite electrode from ethylene carbonate

Tian, Shengfeng; Qi, Li; Wang, Hongyu

doi:10.1016/j.ssi.2016.04.022

Cited by 22 publications

(12 citation statements)

References 19 publications

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“…[ 54 ] In the case of difluoro (oxalate) borate (DFOB - ) in EC, the intercalation of the anion into the graphite happens even at room temperature, but the deintercalation process is rather retarded by EC and the solvation of DFOB - in EC is sensitive to temperature. [ 55 ] In the case of BF 4 - ion solvated by γ ‐butyrolactone solvent, a lesser number of solvent molecules bind to the anion; eventually, more solvent molecules co‐intercalate into the graphitic gallery along with BF 4 - . [ 41 ]…”

Section: Megalo‐capacitance Capacitormentioning

confidence: 99%

Metal‐Ion Capacitors with Anion Intercalation Process

Rajalekshmi

Divya

Natarajan

et al. 2021

Adv Energy and Sustain Res

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The advancement of the modern world demands high‐performance electrical energy storage devices such as metal‐ion capacitors and dual‐ion batteries, and they receive much attention recently with the merits of cost‐effectiveness, safety, environmental friendliness, and high operating voltage. This work emphasizes the metal‐ion capacitors (Li+, Na+, and K+) based on the dual‐carbon combination in which anion intercalation endorses the Faradaic reaction and cation involves in the non‐Faradaic process, promising for greater energy density. The role of graphite, anion graphite intercalation compounds, and the information about the megalo‐capacitance capacitor are first discussed. Subsequently, various influencing factors such as the effect of solvent, electrolyte, conducting salt, cations, and anions affecting the intercalation process are debated in detail. In addition, recently emerging various metal‐ion capacitors based on the anion intercalation process are also reviewed. The major challenges present in the development of the anion‐based hybrid capacitor are finally evaluated and an assessment to fulfill the goals for efficient energy storage is provided.

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Section: Megalo‐capacitance Capacitormentioning

confidence: 99%

Metal‐Ion Capacitors with Anion Intercalation Process

Rajalekshmi

Divya

Natarajan

et al. 2021

Adv Energy and Sustain Res

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“…Graphite intercalation compounds (GICs) are technologically useful functional materials made of graphite flakes uniformly embedding small molecules or metal ions between the graphene sheets [ 1 – 5 ]. Such materials have been intensively studied because of the “staging phenomenon” [ 6 ] and the manifold anomalous physico-chemical behaviors [ 3 – 12 ].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Highly Intercalated Graphite Bisulfate

et al. 2017

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Different chemical formulations for the synthesis of highly intercalated graphite bisulfate have been tested. In particular, nitric acid, potassium nitrate, potassium dichromate, potassium permanganate, sodium periodate, sodium chlorate, and hydrogen peroxide have been used in this synthesis scheme as the auxiliary reagent (oxidizing agent). In order to evaluate the presence of delamination, and pre-expansion phenomena, and the achieved intercalation degree in the prepared samples, the obtained graphite intercalation compounds have been characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray powder diffraction (XRD), infrared spectroscopy (FT-IR), micro-Raman spectroscopy (μ-RS), and thermal analysis (TGA). Delamination and pre-expansion phenomena were observed only for nitric acid, sodium chlorate, and hydrogen peroxide, while the presence of strong oxidizers (KMnO4, K2Cr2O7) led to stable graphite intercalation compounds. The largest content of intercalated bisulfate is achieved in the intercalated compounds obtained from NaIO4 and NaClO3.

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“…Among the organic solvents commonly used in LIBs, ethylene carbonate (EC) appears the most compatible with Li + intercalation into graphite anode. , On the contrary, it retards some anions intercalation into graphite cathode. − This phenomenon mainly originates from the solvation of anions by EC, and the suppressive effect considerably depends on the anion type. As a popular electrolyte anion, BF 4 – intercalates into graphite electrode from neat EC with a very unique manner .…”

Section: Introductionmentioning

confidence: 99%

Abnormal Inverse Current during Anion Deintercalation from Graphite Electrode

Huang

Wang

2019

ACS Appl. Energy Mater.

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It was taken for granted that the charge and discharge processes correspond with distinctly opposite directions of ionic flow when the energy storage mechanism of dual-ion battery was concerned. This common sense is challenged as we find a remarkable countercurrent in the cyclic voltammetric curve during the deintercalation of tetrafluoroborate anions from graphite electrode using ethylene carbonate solution. By electrochemical analysis, there is believed to be backflow of anions during the deintercalation process. The cause of this abnormal ionic flow relates to both the desolvation and resolvation of the intercalated anions inside the graphite electrode. Supportive evidence is provided.

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Difluoro(oxalato)borate anion intercalation into graphite electrode from ethylene carbonate

Cited by 22 publications

References 19 publications

Metal‐Ion Capacitors with Anion Intercalation Process

Metal‐Ion Capacitors with Anion Intercalation Process

Synthesis and Characterization of Highly Intercalated Graphite Bisulfate

Abnormal Inverse Current during Anion Deintercalation from Graphite Electrode

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