Electrolytic Characteristics of Fluoroethylene Carbonate for Electric Double-Layer Capacitors at High Concentrations of Electrolyte

Nambu, Noritoshi; Takahashi, Ryōsuke; Takehara, Masahiro; Ue, Makoto; Sasaki, Yukio

doi:10.5796/electrochemistry.81.817

“…For the same SE and conducting salt, fluoroethylene carbonate (FEC), thus, gave lower activation energy than PC. DMSO resulted in the highest activation barrier [42,63]. The lowest activation energy was reported for the ionic liquid 1-ethyl-3-methylimidazolium tetrafluoroborate ( EMIBF 4 ), which has a lower DN than all the organic solvents [64], confirming the correlation between the DN and activation energy [42].…”

Section: Solid/liquid Interfacesmentioning

confidence: 62%

From Liquid- to Solid-State Batteries: Ion Transfer Kinetics of Heteroionic Interfaces

Weiß

¹

,

Simon

²

,

Busche

³

et al. 2020

Electrochem. Energ. Rev.

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Hybrid battery cells combining liquid electrolytes (LEs) with inorganic solid electrolyte (SE) separators or different SEs and polymer electrolytes (PEs), respectively, are developed to solve the issues of single-electrolyte cells. Among the issues that can be solved are detrimental shuttle effects, decomposition reactions between the electrolyte and the electrodes, and dendrite propagation. However, the introduction of new interfaces by contacting different ionic conductors leads to other problems, which cannot be neglected before commercialization is possible. The interfaces between the different types of ionic conductors (LE/SE and PE/SE) often result in significant charge-transfer resistances, which increase the internal resistance considerably. This review highlights studies evaluating the interfacial resistances and activation barriers in such systems to present an overview of the issues still hampering hybrid battery systems. The interfaces between different SEs in hybrid all-solid-state batteries (SSBs) are considered as well. In addition, a short summary of physicochemical models describing heteroionic interfaces-interfaces between two different ion conductors-is given in an attempt to explain high interface resistances. In doing so, we hope to inspire future work on the crucial topic of interface optimization toward better SSBs.

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“…Basically, the larger the DN value, the better the solvent solubilizes salts. As shown in Figure S2, the DN of EC (16), DMC (17) and FEC (9) are much lower than that of NO 3 − (22) [43–46] . Therefore, the solubility of LiNO 3 in carbonate solvents is very low.…”

Section: Resultsmentioning

confidence: 97%

An Inorganic‐Rich Solid Electrolyte Interphase for Advanced Lithium‐Metal Batteries in Carbonate Electrolytes

Liu

¹

,

Ji

²

,

Piao

³

et al. 2020

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In carbonate electrolytes, the organic–inorganic solid electrolyte interphase (SEI) formed on the Li‐metal anode surface is strongly bonded to Li and experiences the same volume change as Li, thus it undergoes continuous cracking/reformation during plating/stripping cycles. Here, an inorganic‐rich SEI is designed on a Li‐metal surface to reduce its bonding energy with Li metal by dissolving 4m concentrated LiNO3 in dimethyl sulfoxide (DMSO) as an additive for a fluoroethylene‐carbonate (FEC)‐based electrolyte. Due to the aggregate structure of NO3− ions and their participation in the primary Li+ solvation sheath, abundant Li2O, Li3N, and LiNxOy grains are formed in the resulting SEI, in addition to the uniform LiF distribution from the reduction of PF6− ions. The weak bonding of the SEI (high interface energy) to Li can effectively promote Li diffusion along the SEI/Li interface and prevent Li dendrite penetration into the SEI. As a result, our designed carbonate electrolyte enables a Li anode to achieve a high Li plating/stripping Coulombic efficiency of 99.55 % (1 mA cm−2, 1.0 mAh cm−2) and the electrolyte also enables a Li||LiNi0.8Co0.1Mn0.1O2 (NMC811) full cell (2.5 mAh cm−2) to retain 75 % of its initial capacity after 200 cycles with an outstanding CE of 99.83 %.

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“…Basically, the larger the DN value, the better the solvent solubilizes salts. As shown in Figure S2, the DN of EC (16), DMC (17) and FEC (9) are much lower than that of NO 3 -( 22) [41][42][43][44] . Therefore, the solubility of LiNO 3 in carbonate solvents is very low.…”

Section: Solvation Structure and Properties Of The Carbonate Electrolyte With Lino3 Additivementioning

confidence: 99%

An Inorganic‐Rich Solid Electrolyte Interphase for Advanced Lithium‐Metal Batteries in Carbonate Electrolytes

Liu

¹

,

Ji

²

,

Piao

³

et al. 2020

View full text Add to dashboard Cite

In carbonate electrolytes, the organic–inorganic solid electrolyte interphase (SEI) formed on the Li‐metal anode surface is strongly bonded to Li and experiences the same volume change as Li, thus it undergoes continuous cracking/reformation during plating/stripping cycles. Here, an inorganic‐rich SEI is designed on a Li‐metal surface to reduce its bonding energy with Li metal by dissolving 4m concentrated LiNO3 in dimethyl sulfoxide (DMSO) as an additive for a fluoroethylene‐carbonate (FEC)‐based electrolyte. Due to the aggregate structure of NO3− ions and their participation in the primary Li+ solvation sheath, abundant Li2O, Li3N, and LiNxOy grains are formed in the resulting SEI, in addition to the uniform LiF distribution from the reduction of PF6− ions. The weak bonding of the SEI (high interface energy) to Li can effectively promote Li diffusion along the SEI/Li interface and prevent Li dendrite penetration into the SEI. As a result, our designed carbonate electrolyte enables a Li anode to achieve a high Li plating/stripping Coulombic efficiency of 99.55 % (1 mA cm−2, 1.0 mAh cm−2) and the electrolyte also enables a Li||LiNi0.8Co0.1Mn0.1O2 (NMC811) full cell (2.5 mAh cm−2) to retain 75 % of its initial capacity after 200 cycles with an outstanding CE of 99.83 %.

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Electrolytic Characteristics of Fluoroethylene Carbonate for Electric Double-Layer Capacitors at High Concentrations of Electrolyte

Cited by 18 publications

References 13 publications

From Liquid- to Solid-State Batteries: Ion Transfer Kinetics of Heteroionic Interfaces

From Liquid- to Solid-State Batteries: Ion Transfer Kinetics of Heteroionic Interfaces

An Inorganic‐Rich Solid Electrolyte Interphase for Advanced Lithium‐Metal Batteries in Carbonate Electrolytes

An Inorganic‐Rich Solid Electrolyte Interphase for Advanced Lithium‐Metal Batteries in Carbonate Electrolytes

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