7Li NMR study of intercalated lithium in curved carbon lattices

Gerald, Rex E.; Johnson, Christopher; Rathke, J. W.; Klingler, R. J.; Sandı́, Giselle; Scanlon, L. G.

doi:10.1016/s0378-7753(00)00435-3

Cited by 108 publications

(77 citation statements)

References 36 publications

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“…These curved polyarenes (often called p-bowls) are excellent electron acceptors, comparable to planar PAHs [1,2] and fullerenes [3,4], and could serve as key anode components in rechargeable Li-ion batteries. Corannulene, the smallest non-planar fragment of C 60 fullerene [5,6], was shown to exhibit high degree of lithium intercalation upon step-wise reduction [7][8][9][10] and corannulene-based anode materials have demonstrated a high reversible lithium capacity, almost twice as high as that of fully lithiated graphite [11,12]. The family of p-bowls also provides a natural platform for designing new organic materials with applications in light emitting-diodes [13][14][15][16], field-effect transistors [17][18][19], or photovoltaic cells [20].…”

Section: Introductionmentioning

confidence: 99%

Electronic transport properties of selected carbon π-bowls with different size, curvature and solid state packing

Wang

Petrukhina

Margine

2015

Carbon

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Section: Introductionmentioning

confidence: 99%

Electronic transport properties of selected carbon π-bowls with different size, curvature and solid state packing

Wang

Petrukhina

Margine

2015

Carbon

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“…The latter is a consequence of the substantial curvature increase of corannulene and the subsequent tightening of the rim. The bowl depth of C 20 H 10 4À reaches an unprecedented high value of 0.860(6) , which is about three times greater than that in the Li-only triple-decker supramolecular aggregates (0.241(2)-0.355 (2) , and comparable to neutral corannulene (0.875(2) ). [21] structures that the bowl depth varies by about 0.3 AE 0.1 for three aggregates having different external environments.…”

Section: Dedicated To Professor Roald Hoffmann On the Occasion Of Hismentioning

confidence: 87%

“…[2] Geodesic polyaromatic compounds are known to readily acquire multiple electrons upon reduction with alkali metals. C 60 -fullerene can potentially accept up to six extra electrons owing to its triply degenerate and low-lying LUMOs.…”

Section: Dedicated To Professor Roald Hoffmann On the Occasion Of Hismentioning

confidence: 99%

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Clamshell Opening in the Mixed‐Metal Supramolecular Aggregates Formed by Fourfold Reduced Corannulene for Maximizing Intercalated Metal Content

et al. 2013

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“…2b). [16][17][18][19] The peak of Li in the LCO cathode appears at around 0 ppm. The intensity varies with SOC, but the peak is much smaller than the peak for Li in the electrolyte or stored in the anode.…”

Section: Negative Materialsmentioning

confidence: 99%

A Study on the Cycle Life of Lithium-Ion Batteries Using In Situ⁷Li Solid-State Nuclear Magnetic Resonance

Arai

Nakahigashi

Sugiyama

2016

J. Electrochem. Soc.

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The capacity fading of lithium ion batteries (LIBs) is investigated, using in situ 7 Li solid-state nuclear magnetic resonance (NMR). LIB cells consisting of graphite or hard carbon and LiCoO 2 are used and cycled under two different temperatures (10 and 25 • C) and charge current rates (0.5 and 1 C). The cell capacity and the amount of Li stored in carbon are measured with a battery cycler and in situ 7 Li solid-state NMR measurements before the beginning of the test and after every 100 test cycles. The in situ 7 Li solid state NMRs provide sufficient information throughout the cycle tests to characterize all test conditions. The cell capacities are analyzed in terms of the 7 Li NMR peak intensity, attributed to Li stored in carbon. This intensity shows affine proportionality with the cell capacity for every evaluation, with an additive constant that decreases with the increase in cell capacity fading. This may be related to the loss of Li storage caused by voltage "slippage. Lithium-ion batteries (LIBs) have been widely used in portable electronic devices and as power sources for mobile machines such as electric vehicles, hybrid electric vehicles, e-bikes, e-scooters, and electric wheelchairs. To ensure the sustainability and endurance of these devices, it is necessary to understand battery degradation (in both capacity and power) due to daily use.1 LIBs are charged and discharged by Li insertion without chemical reactions, and the degradation of electrode materials is consequently small. LIBs are therefore widely considered to be excellent batteries, with long cycle lives. However, capacity fading occurs when LIBs are used outside moderate temperature ranges, at high current, with high voltage storage, etc. The capacity balance between positive and negative electrodes is lost (called "slippage") because of charge and discharge operations with low accuracy controllers or parasitic reactions during operation and storage.2-9 Slippage causes gradual capacity fading, because cell capacity is determined by the capacity balance between the positive and negative electrodes.Previous studies have reported how and when slippage induces capacity fading, but not how slippage occurs and what it is exactly. To fully understand capacity fading and slippage, nondestructive measurements are needed, because capacity fading due to slippage will only be properly observed if the cell internal conditions are fully maintained.To examine the state inside the battery without destroying it, we developed an in situ 7 Li solid-state nuclear magnetic resonance (NMR) measurement method, using full-cell test equipment consisting of actual positive and negative electrodes. Using this method, we studied Li insertion/extraction in carbon with charge/discharge operations, Li dendrite growth during overcharges, and the properties of dendritic Li after being formed. 10,11 This study investigated the change in NMR peak intensity of the Li stored in the cycle test, to elucidate cell capacity fading in terms of the amount of Li storage at the select...

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7Li NMR study of intercalated lithium in curved carbon lattices

Cited by 108 publications

References 36 publications

Electronic transport properties of selected carbon π-bowls with different size, curvature and solid state packing

Electronic transport properties of selected carbon π-bowls with different size, curvature and solid state packing

Clamshell Opening in the Mixed‐Metal Supramolecular Aggregates Formed by Fourfold Reduced Corannulene for Maximizing Intercalated Metal Content

A Study on the Cycle Life of Lithium-Ion Batteries Using In Situ⁷Li Solid-State Nuclear Magnetic Resonance

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7Li NMR study of intercalated lithium in curved carbon lattices

Cited by 108 publications

References 36 publications

Electronic transport properties of selected carbon π-bowls with different size, curvature and solid state packing

Electronic transport properties of selected carbon π-bowls with different size, curvature and solid state packing

Clamshell Opening in the Mixed‐Metal Supramolecular Aggregates Formed by Fourfold Reduced Corannulene for Maximizing Intercalated Metal Content

A Study on the Cycle Life of Lithium-Ion Batteries Using In Situ7Li Solid-State Nuclear Magnetic Resonance

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A Study on the Cycle Life of Lithium-Ion Batteries Using In Situ⁷Li Solid-State Nuclear Magnetic Resonance