Ultrafast charge transfer at the electrode−electrolyte interface via an artificial dielectric layer

Teranishi, Takashi; Kozai, K.; Yasuhara, Sou; Yasui, Shintaro; Ishida, Naoyuki; Ishida, Kunihiro; Nakayama, Masanobu; Kishimoto, Akira

doi:10.1016/j.jpowsour.2021.229710

Cited by 15 publications

(18 citation statements)

References 53 publications

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“…The permittivity of monodispersed NCs is slightly greater than that of conventional sphere‐shaped nanoparticles (e.g., 78.2 for 30 nm diameter nanoparticles). [ 19 ] The partial morphological relaxation of an NC to a spherical form by heat treatment further depressed the permittivity due to relaxation of the large internal lattice strain of the NC. In addition, some Li ions diffused to the BTO from the LCO matrix at higher temperatures, which resulted in an interdiffusion layer, e.g., Li δ Ba 1‐ δ TiO 3 , having an even smaller ε r than pristine BTO.…”

Section: Resultsmentioning

confidence: 99%

“…[ 8–15 ] A great advance occurred with the incorporation of the BaTiO 3 (BTO)‐based “artificial dielectric interfaces” architecture into the active materials–electrolyte interface. [ 16–19 ] This strategy has led to a significant reduction in the R ct of LIBs, which in turn has yielded extremely high rate capabilities despite the incorporation of insulators traditionally used in ceramic capacitors. [ 20–22 ] Our previous research identified the fast Li‐ion pathway via a dielectric interface using theoretical and experimental approaches.…”

Section: Introductionmentioning

confidence: 99%

“…[ 20–22 ] Our previous research identified the fast Li‐ion pathway via a dielectric interface using theoretical and experimental approaches. [ 18,19 ] Density functional theory molecular dynamics calculations revealed that ethylene carbonate (EC)‐solvated Li ions preferentially adsorbed onto the dielectric surface under a direct current electric field during discharge when the permittivity of the dielectric and the solvent were similar. [ 19 ] The adsorbed EC‐solvated Li ions were subsequently desolvated on the same dielectric surface.…”

Section: Introductionmentioning

confidence: 99%

“…[ 18,19 ] Density functional theory molecular dynamics calculations revealed that ethylene carbonate (EC)‐solvated Li ions preferentially adsorbed onto the dielectric surface under a direct current electric field during discharge when the permittivity of the dielectric and the solvent were similar. [ 19 ] The adsorbed EC‐solvated Li ions were subsequently desolvated on the same dielectric surface. The desolvated naked Li ions diffused across the dielectric surface and arrived at the dielectric−electrode−electrolyte interface, i.e., the triple‐phase interface (TPI).…”

Section: Introductionmentioning

confidence: 99%

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Ultrafast Ion Transport via Dielectric Nanocube Interface

Teranishi

Yamanaka

Mimura

et al. 2021

Adv Materials Inter

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Drastic enhancement in the high‐rate capability of lithium‐ion batteries to the level of supercapacitors while maintaining high energy density is required for next‐generation power sources. Incorporating dielectric BaTiO3 (BTO)‐based nanocubes (NCs) into the active materials–electrolyte interface provides an ultrafast charge transfer pathway via the dielectric layer. The highly dispersed NC‐decorated LiCoO2 (LCO) treated at the optimized temperature of 600 °C displays significantly enhanced high‐rate capability; the cell maintains 56.7 mAh g‐1 at 50C (1C = 160 mA g‐1), which compares with null capacity at the same rate for bare LCO. Comparing the NCs with conventional sol‐gel‐derived nanoparticles, the capacity retention at 10C (vs 0.1C) steadily increases with increasing active materials–dielectric–electrolyte triple‐phase interface (TPI) in the NC‐decorated case, whereas the capacity retention decreases markedly at similar TPI density in the sol‐gel case. In the sol‐gel case, the amount of Li ions accumulating at the TPI greatly exceeds the maximum amount of Li ions involved in electron exchange through the redox reaction within the charge/discharge time. In the NC case, most Li ions at the TPI participate effectively in the redox reaction, which results in fast charge transfer since the TPI sites are abundantly supplied with Li ions.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Ultrafast Ion Transport via Dielectric Nanocube Interface

Teranishi

Yamanaka

Mimura

et al. 2021

Adv Materials Inter

Self Cite

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“…In a subsequent study, the group was able to determine a similar permittivity of the dielectric layer and the electrolyte as the underlying reason for improved charge transfer. [ 239 ] Analyzing bare LCO, LCO decorated with TiO 2 , and LCO decorated with BaTiO 3 , all resulting in different permittivity of the dielectric surface layer, in combination with electrolytes based on DMC (low permittivity) and EC:DEC (high permittivity), the authors found a correlation between the capacity retention at high charging rates (10C) and the dielectric constant of the dielectric layer. For DMC, the bare LCO surface exhibiting the lowest permittivity showed improved capacity retention.…”

Section: Cathodementioning

confidence: 99%

Fast Charging of Lithium‐Ion Batteries: A Review of Materials Aspects

Weiß

Rueß

Kasnatscheew

et al. 2021

Advanced Energy Materials

548

348

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Fast charging is considered to be a key requirement for widespread economic success of electric vehicles. Current lithium‐ion batteries (LIBs) offer high energy density enabling sufficient driving range, but take considerably longer to recharge than traditional vehicles. Multiple properties of the applied anode, cathode, and electrolyte materials influence the fast‐charging ability of a battery cell. In this review, the physicochemical basics of different material combinations are considered in detail, identifying the transport of lithium inside the electrodes as the crucial rate‐limiting steps for fast‐charging. Lithium diffusion within the active materials inherently slows down the charging process and causes high overpotentials. In addition, concentration polarization by slow lithium‐ion transport within the electrolyte phase in the porous electrodes also limits the charging rate. Both kinetic effects are responsible for lithium plating observed on graphite anodes. Conclusions drawn from potential and concentration profiles within LIB cells are complemented by extensive literature surveys on anode, cathode, and electrolyte materials—including solid‐state batteries. The advantages and disadvantages of typical LIB materials are analyzed, resulting in suggestions for optimum properties on the material and electrode level for fast‐charging applications. Finally, limitations on the cell level are discussed briefly as well.

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Ultrahigh‐Voltage LiCoO₂ at 4.7 V by Interface Stabilization and Band Structure Modification

et al. 2023

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capacity of commercial LCO only reaches 150-180 mAh g −1 with the limitation of cut-off voltage (4.3-4.5 V versus Li/Li + ), so it still has much capacity to release to reach its theoretical specific capacity (274 mAh g −1 ). [4,5] Although increasing the cut-off voltage improves the capacity and energy density, it also brings many challenges. First, when charged to a voltage higher than 4.55 V, LCO undergoes a harmful phase transition from hexagonal O3 phase to hybridized O1-O3 hexagonal (H1-3) phase accompanied by the sliding of the OCoO slabs and collapse of O3 lattice structure. [6,7] This increases the strain of the LCO particles and leads to the formation of cracks and fragmentations in crystal particles. [8,9] Second, superficial lattice oxygen is readily oxidized to peroxide state O − at high cut-off voltages due to the overlap between the resonance bands of O 2p and Co 3d . Oxidized O − not only destroys the LCO-electrolyte interface but also causes severe gas formation when it rapidly converts into O 2 [10,11]

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Ultrafast charge transfer at the electrode−electrolyte interface via an artificial dielectric layer

Cited by 15 publications

References 53 publications

Ultrafast Ion Transport via Dielectric Nanocube Interface

Ultrafast Ion Transport via Dielectric Nanocube Interface

Fast Charging of Lithium‐Ion Batteries: A Review of Materials Aspects

Ultrahigh‐Voltage LiCoO₂ at 4.7 V by Interface Stabilization and Band Structure Modification

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Ultrafast charge transfer at the electrode−electrolyte interface via an artificial dielectric layer

Cited by 15 publications

References 53 publications

Ultrafast Ion Transport via Dielectric Nanocube Interface

Ultrafast Ion Transport via Dielectric Nanocube Interface

Fast Charging of Lithium‐Ion Batteries: A Review of Materials Aspects

Ultrahigh‐Voltage LiCoO2 at 4.7 V by Interface Stabilization and Band Structure Modification

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Ultrahigh‐Voltage LiCoO₂ at 4.7 V by Interface Stabilization and Band Structure Modification