Short-range contacts govern the performance of industry-relevant battery cathodes

Morelly, Samantha L.; Alvarez, Nicolas J.; Tang, Maureen H.

doi:10.1016/j.jpowsour.2018.03.039

Cited by 49 publications

(75 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Lastly, simulations of the short circuit current response of cells during 4.5 V potentiostatic charging and shorting are performed using these fitted parameters with different ρ PEC values. The results for the single-layer separator (ρ = 25 Ω cm, representing the resistivity of cathode alone with no additional PEC layer), [47] and with a PEC layer of ρ PEC = 2500 Ω cm and 2 50 000 Ω cm are overlaid in Figure 4a. Simply enough, the higher the PEC resistivity, the more prolonged the onset of shorting.…”

mentioning

confidence: 99%

Draining Over Blocking: Nano‐Composite Janus Separators for Mitigating Internal Shorting of Lithium Batteries

et al. 2020

View full text Add to dashboard Cite

Catastrophic battery failure due to internal short is extremely difficult to detect and mitigate. In order to enable the next‐generation lithium‐metal batteries, a “fail safe” mechanism for internal short is highly desirable. Here, a novel separator design and approach is introduced to mitigate the effects of an internal short circuit by limiting the self‐discharge current to prevent cell temperature rise. A nano‐composite Janus separator—with a fully electronically insulating side contacting the anode and a partially electronically conductive (PEC) coating with tunable conductivity contacting the cathode—is implemented to intercept dendrites, control internal short circuit resistance, and slowly drain cell capacity. Galvanostatic cycling experiments demonstrate Li‐metal batteries with the Janus separator perform normally before shorting, which then results in a gradual increase of internal self‐discharge over >25 cycles due to PEC‐mitigated shorting. This is contrasted by a sudden voltage drop and complete failure seen with a single layer separator. Potentiostatic charging abuse tests of Li‐metal pouch cells result in dendrites completely penetrating the single‐layer separator causing high short circuit current and large cell temperature increase; conversely, negligible current and temperature rise occurs with the Janus separator where post mortem electron microscopy shows the PEC layer successfully intercepts dendrites.

show abstract

mentioning

confidence: 99%

Draining Over Blocking: Nano‐Composite Janus Separators for Mitigating Internal Shorting of Lithium Batteries

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Oscillation shear measurements are more appropriate than rotational shear measurements to investigate the network structure inside the slurry . Morelly et al used oscillation shear measurements for detecting free CB in the electrode slurry . The results of the amplitude sweep analysis are shown in Figure .…”

Section: Resultsmentioning

confidence: 99%

“…Particular attention is paid by many researchers on the dispersion of the conductive additives CB and graphite in the suspension and in the final electrode structure, especially on the cathode side . CB forms weak agglomerates, which consist of chemically bound aggregates.…”

Section: Introductionmentioning

confidence: 99%

“…Although CB plays a crucial role in the electrode, the determination of CB aggregate and agglomerate size in battery suspensions is quite difficult. Often rheology measurements were used for detecting the CB dispersion degree in battery suspensions . Morelly et al used frequency sweeps to obtain storage and loss moduli as a measurement for the free CB inside the slurry.…”

Section: Introductionmentioning

confidence: 99%

“…Morelly et al used frequency sweeps to obtain storage and loss moduli as a measurement for the free CB inside the slurry. But a relationship between rheology and discharge capacity was difficult to find . A few researchers used particle size analysis via laser light scattering for direct determination of the CB size.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Extrusion‐Based Processing of Cathodes: Influence of Solid Content on Suspension and Electrode Properties

2019

View full text Add to dashboard Cite

The influence of the solid content is investigated for cathodes with nickel cobalt manganese oxide (NCM) as an active material during the continuous dispersion in a twin‐screw extruder as well as during the coating and drying processes. Rheological and particle size distribution analyses are carried out to characterize the suspensions. Specifically, mechanical, structural, and electrochemical properties of the manufactured electrodes are determined. The presented results show that an increase in the solid content of the electrode suspension during the extrusion process results in a higher carbon black (CB) dispersion degree due to a higher energy input. At solid content above 80 wt%, delamination of conductive graphite and deposition of CB onto the active material occur. Furthermore, it is proved that within a range of 70–75 wt% solid content, the mechanical, conductive, and electrochemical performances can be enhanced.

show abstract

Demystifying Charge Transport Limitations in the Porous Electrodes of Lithium‐Ion Batteries

Hamed

Yari

D’Haen

et al. 2020

Advanced Energy Materials

View full text Add to dashboard Cite

A possible strategy to give a simultaneous boost to the energy and power attributes of the current generation of lithium‐ion batteries is developing thick porous electrodes with a high loading of active material alongside optimal percolation networks for the ions and electrons. However high the insertion capacity and kinetics of the single particle lithium‐insertion materials, the energy and power density of the cell can be capped by the ionic and electronic transport limitations in the porous electrode. In this work, a physical picture grounded in experiment and theory is proposed to spotlight and quantify the pivotal role of the micro‐scale porosity and active‐material loading in determining the tortuosity, effective transport properties, and performance limitations of porous electrodes. The outcome is a phenomenological picture coupled with a theoretical framework for the deconvolution of the relative shares of the electronic and ionic transport limitations over short and long ranges regarding the performance limitation of lithium‐ion batteries.

show abstract

Short-range contacts govern the performance of industry-relevant battery cathodes

Cited by 49 publications

References 42 publications

Draining Over Blocking: Nano‐Composite Janus Separators for Mitigating Internal Shorting of Lithium Batteries

Draining Over Blocking: Nano‐Composite Janus Separators for Mitigating Internal Shorting of Lithium Batteries

Extrusion‐Based Processing of Cathodes: Influence of Solid Content on Suspension and Electrode Properties

Demystifying Charge Transport Limitations in the Porous Electrodes of Lithium‐Ion Batteries

Contact Info

Product

Resources

About