Enhanced activated carbon lithium-ion capacitor electrochemical stability through electrolyte dielectric optimisation

Eleri, Obinna Egwu; Pires, Julie; Lu, Song; Schweigart, Philipp; Svensson, Ann Mari; Lou, Fengliu; Yu, Zhixin

doi:10.1039/d3se00122a

Cited by 3 publications

(4 citation statements)

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“…While the upper cutoff limit of 4.2 V vs. Li/Li + is in good agreement with other studies, [15,47] the cathodic potential limit is lower than in other studies investigating 1 M LiPF 6 + EC/DMC on AC. Wohlfahrt-Mehrens et al identified the cathodic stability limit of YP-50 AC in 1 M LiPF 6 + EC/DMC (1 : 1) to be 1.5 V vs. Li/ Li + by voltammetric window opening experiments.…”

Section: Comparison To Electrochemical Stability Window Of Lipfsupporting

confidence: 91%

“…À anion, deposition of carbonate due to EC decomposition, and formation of surface defects on the AC as degradation pathways. [15] In another study involving LIC full cells, the generation of HF acid at the AC cathode at a potential of 4.27 V vs. Li/Li + was found to result from oxidative decomposition of the PF 6…”

Section: Introductionmentioning

confidence: 98%

“…The aspect of aluminum corrosion in LiFSI is revisited, in light of high-voltage AC electrodes, including the use of carbon-primed aluminum current collectors, which are commonly used in battery and supercapacitor electrodes to minimize contact resistance of active material and current collector. [15,28] Finally, the ESW and rate performance are compared to the state-of-the art LiPF 6 in EC/DMC (1 : 1 wt %) electrolyte on the same AC. This study puts forward a guideline to determine the stable voltage operating window of AC cathodes for LICs towards better device performance, safety and longevity.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

On the Viability of Lithium Bis(fluorosulfonyl)imide as Electrolyte Salt for Use in Lithium‐Ion Capacitors

Schweigart

Eleri

Nylund

et al. 2023

Batteries & Supercaps

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Lithium‐ion capacitors (LICs) represent promising high power energy storage devices, most commonly composed of a Li‐ion intercalation anode (e.g., graphite or hard carbon), a supercapacitor activated carbon (AC) cathode, and an electrolyte with 1 M LiPF6 in carbonate solvents. Here, we report on the feasibility of replacing LiPF6 with the novel salt LiFSI for use with AC electrodes. Based on voltage hold measurements in a half‐cell setup, good long‐term stability is achieved with an upper cut‐off voltage of 3.95 V vs. Li/Li+, potentially enabling cell voltages of ~3.8 V when combined with graphite anodes (operating at ~0.1 V vs. Li/Li+) in LIC full cells. The systematic comparison of cyclic voltammetry, leakage current analysis, and capacity retention upon voltage hold highlights the importance of the latter method to provide a realistic assessment of the electrochemical stability window of LiFSI on AC. The morphological and surface‐chemical post‐mortem analysis of AC electrodes used with LiFSI revealed that the oxidation of the FSI anion, as evidenced by the presence of new S 2p and N 1s features in the XPS spectra, and an increasing amount of oxygenated species on the AC were the main processes causing capacity fade at positive polarization.

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Section: Comparison To Electrochemical Stability Window Of Lipfsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

On the Viability of Lithium Bis(fluorosulfonyl)imide as Electrolyte Salt for Use in Lithium‐Ion Capacitors

Schweigart

Eleri

Nylund

et al. 2023

Batteries & Supercaps

Self Cite

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“…Properties of the electrolytes, such as dielectric, viscosity, and conductivity, have also been demonstrated to affect the self-discharge, rate performance, and electrochemical stability of the AC cathode. Eleri et al [128] revealed that the electrolyte dielectric can influence the electrochemical stability of the AC cathode. Increasing the electrolyte dielectric improved the anion oxidative stability at the double layer region by modifying the solvation shell and increasing the resistance to oxidation during polarization at high energies.…”

Section: Electrolyte Dielectric and Viscositymentioning

confidence: 99%

Lithium-Ion Capacitors: A Review of Strategies toward Enhancing the Performance of the Activated Carbon Cathode

Eleri,

Lou,

2023

Batteries

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Lithium-ion capacitors (LiC) are promising hybrid devices bridging the gap between batteries and supercapacitors by offering simultaneous high specific power and specific energy. However, an indispensable critical component in LiC is the capacitive cathode for high power. Activated carbon (AC) is typically the cathode material due to its low cost, abundant raw material for production, sustainability, easily tunable properties, and scalability. However, compared to conventional battery-type cathodes, the low capacity of AC remains a limiting factor for improving the specific energy of LiC to match the battery counterparts. This review discusses recent approaches for achieving high-performance LiC, focusing on the AC cathode. The strategies are discussed with respect to active material property modifications, electrodes, electrolytes, and cell design techniques which have improved the AC’s capacity/capacitance, operating potential window, and electrochemical stability. Potential strategies and pathways for improved performance of the AC are pinpointed.

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Deciphering electrolyte dielectric extended electrochemical stability in lithium-ion capacitors

Eleri

Lou

2023

Electrochimica Acta

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Enhanced activated carbon lithium-ion capacitor electrochemical stability through electrolyte dielectric optimisation

Abstract: Interactions between electrolyte constituents and active materials strongly influence the capacity, energy density, and cycling stability of energy storage devices. In this study, the role of electrolyte dielectric on the...

Cited by 3 publications

References 50 publications

On the Viability of Lithium Bis(fluorosulfonyl)imide as Electrolyte Salt for Use in Lithium‐Ion Capacitors

On the Viability of Lithium Bis(fluorosulfonyl)imide as Electrolyte Salt for Use in Lithium‐Ion Capacitors

Lithium-Ion Capacitors: A Review of Strategies toward Enhancing the Performance of the Activated Carbon Cathode

Deciphering electrolyte dielectric extended electrochemical stability in lithium-ion capacitors

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