Progress in Separators for Rechargeable Batteries

Yang, Cheng‐song; Han, Dian-Hui; Zhang, Meng

doi:10.1002/9781119714774.ch1

Cited by 5 publications

(4 citation statements)

References 24 publications

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“…4a. The sluggish kinetics in the graphite anode part is reported to be the main challenge that will push the Li + intercalation potential into graphite below 0 V (vs. Li/Li + ) 8,9,25,30 , which is verified by the much larger impedance of the graphite anode compared to the LCO cathode, especially at LT (Fig S22). DRT mapping of Gr/Li half-cells over two electrochemical cycles at -10 ℃ in the base and EHFB electrolytes (Fig 4g-h) reveal that, the EHFB system exhibit much smaller Rct compared with the base electrolyte, again implying that the cosolvent can facilitate charger transfer for the low temperature trapped graphite anode.…”

Section: Unlock the Electrolyte Solvation Interactionmentioning

confidence: 89%

“…Strategies including liquefied gas electrolytes 20,21 , novel co-solvents 22,23 , highly fluorinated solvents 4,24 , PC based electrolytes 25 , local high concentration electrolytes (LHCEs) 4,8,23,26,27 , and weakly solvating electrolytes 4,8,9,23,25,27,28,29 , and cointercalation method 30 have been therefore proposed to optimize the solvation structures. These strategies trend to promote more anion to solvate with Li + and mainly rely on low dielectric constant (ε) solvents to replace EC, therefore facilitating desolvation process.…”

Section: Introductionmentioning

confidence: 99%

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Breaking Solvation Dominance of EC via Electron Engineering Enables Battery Operation Below -100℃

Chen

Zhao

et al. 2023

Preprint

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The performance of current lithium-ion batteries (LIBs) is severely impaired by low temperatures, which require the development of powerful electrolytes with widen liquidity, facilitated ion diffusion ability, and lower desolvation energy. The keys lie in establishing mild interactions between Li+ and solvent molecules internally, which is hard to realize in commercial ethylene carbonate (EC) based electrolytes due to the strong coordination of EC to Li+. To address this challenge, we tailored the solvation structure with low-ε solvent dominated coordination and unlocked EC via electronegativity regulation of carbonyl oxygen. The modified electrolytes retain considerable ion conductivity (1.46 mS/cm) at -90 ℃, remain liquid at -110℃, and facilitate Li+ desolvation. Consequently, 4.5V graphite-based pouch cells perform stably with ~98% capacity retention and no lithium dendrite formation over 200 cycles at -10 ℃. These cells also retain ~60% of their room-temperature discharge capacity at -70 ℃, and miraculously remain functional even below -100 ℃. This design strategy of breaking the solvation dominance of EC via electron engineering can be extended to other alkali-metal-ion batteries at extremely low temperature.

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Section: Unlock the Electrolyte Solvation Interactionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Breaking Solvation Dominance of EC via Electron Engineering Enables Battery Operation Below -100℃

Chen

Zhao

et al. 2023

Preprint

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“…Li‐ion batteries are the leading technology, especially in the e‐mobility sector, but their energy and power density are relatively low compared to fossil fuels. However, research into new electrolytes, [ 1,2 ] separators, [ 3–5 ] anode materials, [ 6–8 ] and cathode materials still offers potential for optimization. [ 9–11 ] Lithium iron phosphate (LiFePO 4 ), also denoted as LFP, is a promising cathode material due to its good price–performance ratio, good cycling stability, high robustness, satisfying cycle life, wide temperature range (−30 to 60 °C) and good rate capability.…”

Section: Introductionmentioning

confidence: 99%

3D Multiscale Lithium‐Ion Cell Modeling for LiFePO₄Freeze‐Casted Electrode Structures Using Synchrotron X‐Ray and FIB/SEM Tomography

Franke‐Lang

Hilger

Manke

et al. 2023

Advcd Theory and Sims

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The performance of batteries and the associated operating areas depend, among other things, on the 3D microstructures of the electrode materials, and thus fundamental research is required in the field of electrode design. A multiscale microstructure‐resolved 3D model is developed that investigates two different LiFePO4 freeze‐casted electrode structures, that is, cellular and lamellar. The microstructure is simulated directly from the X‐ray computed tomography data and the nanostructure is combined with the pseudo‐2D simulation approach, where the morphological parameters and the distribution of the binder, carbon, and LiFePO4 are obtained from ex situ focused ion beam scanning electron microscopy measurements. The discharge performance shows that the lamellar structure exhibits a lower ohmic overvoltage and achieves a higher gravimetric capacity compared to the cellular structure, even though both electrode materials have the same porosity and amount of active material. The simulation reveals that the performance is not only directly influenced by the lithium‐ion transport through the porous structure but also by the current distribution through the active material. Based on these insights, lamellar electrode structures should be considered for next‐generation battery electrodes. The modeling approach can assist in electrode fabrication by identifying defects or suggesting better structural parameters.

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“…On the material level of the cathode, LFP could be one of the promising candidates [2]. Besides the continuous improvement of cathode materials, electrolytes [3] and separators [4,5] or the replacement of graphite by metal anodes [6], the cathode structure could be an essential factor to achieve these goals. In general, porous electrodes with low tortuosity provide efficient ion flow and ensure uniform replenishment of the lithium supply, especially at high discharge rates [7].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Model-Based Investigation of Thick LiFePO4 Electrode Design Parameters

Franke‐Lang

Kowal

2021

Modelling

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The electrification of the powertrain requires enhanced performance of lithium-ion batteries, mainly in terms of energy and power density. They can be improved by optimising the positive electrode, i.e., by changing their size, composition or morphology. Thick electrodes increase the gravimetric energy density but generally have an inefficient performance. This work presents a 2D modelling approach for better understanding the design parameters of a thick LiFePO4 electrode based on the P2D model and discusses it with common literature values. With a superior macrostructure providing a vertical transport channel for lithium ions, a simple approach could be developed to find the best electrode structure in terms of macro- and microstructure for currents up to 4C. The thicker the electrode, the more important are the direct and valid transport paths within the entire porous electrode structure. On a smaller scale, particle size, binder content, porosity and tortuosity were identified as very impactful parameters, and they can all be attributed to the microstructure. Both in modelling and electrode optimisation of lithium-ion batteries, knowledge of the real microstructure is essential as the cross-validation of a cellular and lamellar freeze-casted electrode has shown. A procedure was presented that uses the parametric study when few model parameters are known.

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Progress in Separators for Rechargeable Batteries

Cited by 5 publications

References 24 publications

Breaking Solvation Dominance of EC via Electron Engineering Enables Battery Operation Below -100℃

Breaking Solvation Dominance of EC via Electron Engineering Enables Battery Operation Below -100℃

3D Multiscale Lithium‐Ion Cell Modeling for LiFePO₄Freeze‐Casted Electrode Structures Using Synchrotron X‐Ray and FIB/SEM Tomography

Electrochemical Model-Based Investigation of Thick LiFePO4 Electrode Design Parameters

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Progress in Separators for Rechargeable Batteries

Cited by 5 publications

References 24 publications

Breaking Solvation Dominance of EC via Electron Engineering Enables Battery Operation Below -100℃

Breaking Solvation Dominance of EC via Electron Engineering Enables Battery Operation Below -100℃

3D Multiscale Lithium‐Ion Cell Modeling for LiFePO4Freeze‐Casted Electrode Structures Using Synchrotron X‐Ray and FIB/SEM Tomography

Electrochemical Model-Based Investigation of Thick LiFePO4 Electrode Design Parameters

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3D Multiscale Lithium‐Ion Cell Modeling for LiFePO₄Freeze‐Casted Electrode Structures Using Synchrotron X‐Ray and FIB/SEM Tomography