Electrochemistry Coupled Mesoscale Complexations in Electrodes Lead to Thermo-Electrochemical Extremes

Mistry, Aashutosh; Smith, Kandler; Mukherjee, Partha P.

doi:10.1021/acsami.8b08993

Cited by 52 publications

(76 citation statements)

References 71 publications

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“…charge-transfer reactions at the interphase). 27 The general equation evaluating the heat generation rate by a single cell as described by Bernardi et al 28 in its simplified form is:Q…”

Section: Literature Reviewmentioning

confidence: 99%

The Cell Cooling Coefficient: A Standard to Define Heat Rejection from Lithium-Ion Batteries

Hales

Diaz

Marzook

et al. 2019

J. Electrochem. Soc.

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Lithium-ion battery development is conventionally driven by energy and power density targets, yet the performance of a lithium-ion battery pack is often restricted by its heat rejection capabilities. It is therefore common to observe elevated cell temperatures and large internal thermal gradients which, given that impedance is a function of temperature, induce large current inhomogeneities and accelerate cell-level degradation. Battery thermal performance must be better quantified to resolve this limitation, but anisotropic thermal conductivity and uneven internal heat generation rates render conventional heat rejection measures, such as the Biot number, unsuitable. The Cell Cooling Coefficient (CCC) is introduced as a new metric which quantifies the rate of heat rejection. The CCC (units W.K −1) is constant for a given cell and thermal management method and is therefore ideal for comparing the thermal performance of different cell designs and form factors. By enhancing knowledge of pack-wide heat rejection, uptake of the CCC will also reduce the risk of thermal runaway. The CCC is presented as an essential tool to inform the cell down-selection process in the initial design phases, based solely on their thermal bottlenecks. This simple methodology has the potential to revolutionise the lithium-ion battery industry.

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“…charge-transfer reactions at the interphase). 27 The general equation evaluating the heat generation rate by a single cell as described by Bernardi et al 28 in its simplified form is:Q…”

Section: Literature Reviewmentioning

confidence: 99%

The Cell Cooling Coefficient: A Standard to Define Heat Rejection from Lithium-Ion Batteries

Hales

Diaz

Marzook

et al. 2019

J. Electrochem. Soc.

View full text Add to dashboard Cite

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“…27 A significant fraction of heat generated within a cell is due to transport resistance faced by ions and electrons. 42 This implies that electrode formulations which modulate the number and amount of conductive additives and ionic transport properties also affect the heat generation behavior. Further, the electrode composition also affects the specific heat capacity of the cell.…”

Section: Thermalmentioning

confidence: 99%

A review of safety considerations for batteries in aircraft with electric propulsion

2021

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Modern aircraft designs for “more electric” and “fully electric” aircraft have large battery packs ranging from tens of kWh for urban aviation to hundreds or thousands of kWh for commercial aviation. Such large battery packs require careful consideration of the safety concerns unique to aviation. The most pertinent safety concerns related to batteries can be categorized into two broad areas: exothermic heat related events (thermal issues) and partial or complete loss of safety–critical power supply (functional issues). Degradation during operation of a battery can contribute to capacity fade, increased internal resistance, power fade, and internal short circuits, which lead to the loss of or decrease in propulsive power. When batteries are the primary source of onboard power and energy, it is crucial to be able to estimate their state-of-health in terms of capacity and power capability. Internal short circuits and other sources of excessive heat generation can lead to high temperatures within the cells of a battery pack leading to safety concerns and thermal events. One of the biggest risk factors for batteries used in aviation is the potential for thermal runaway where temperatures reach the flashpoint of one of the cell components, eventually cascading over multiple cells leading to system-wide battery pack failure and a fire hazard. This article reviews the current understanding of the safety concerns related to batteries in the context of urban and regional electric aviation.

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“…At the electrode scale in Figure 4b, the differences in anode and cathode response sensitivity to changes in design parameters (porosity, wt%, binder fraction) are reflected by showing differences in thermal, electrochemical, and plating signatures at the cell level. 57 The variations in electrode design parameters influence the kinetic and transport limitations within the anode and cathode distinctly. As a result, Figure 4c compares how the morphologies of particles dictate the potential profile and side reaction versus extent of lithiation.…”

Section: Predicting Multiscale Thermal Behaviormentioning

confidence: 99%

“…56 Figure 4d shows that coupled microstructureresolved crosstalk between anode and cathode leads to inhomogeneous intercalation, plating, and heat generation signatures at the cell level. 57 Here, the cell performance is closely related to the anode structure, while temperature rise and hence safety is more linked to the cathode specification. In contrast, plating shows a co-dependence on both electrodes.…”

Section: Predicting Multiscale Thermal Behaviormentioning

confidence: 99%

“…Multiscale modeling of lithium-ion batteries. (a) Particle morphology design 56 and (b) heterogeneity within the electrode's microstructural arrangement57 significantly influence the performance,56 plating, and heat generation 57 in (c, d). (e) Localized heat generation induced by cell architecture heterogeneity impacts the intercalation and plating dynamics 58.…”

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confidence: 99%

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From material properties to multiscale modeling to improve lithium-ion energy storage safety

et al. 2021

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Energy storage using lithium-ion cells dominates consumer electronics and is rapidly becoming predominant in electric vehicles and grid-scale energy storage, but the high energy densities attained lead to the potential for release of this stored chemical energy. This article introduces some of the paths by which this energy might be unintentionally released, relating cell material properties to the physical processes associated with this potential release. The selected paths focus on the anode–electrolyte and cathode–electrolyte interactions that are of typical concern for current and near-future systems. Relevant material processes include bulk phase transformations, bulk diffusion, surface reactions, transport limitations across insulating passivation layers, and the potential for more complex material structures to enhance safety. We also discuss the development, parameterization, and application of predictive models for this energy release and give examples of the application of these models to gain further insight into the development of safer energy storage systems.

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Electrochemistry Coupled Mesoscale Complexations in Electrodes Lead to Thermo-Electrochemical Extremes

Cited by 52 publications

References 71 publications

The Cell Cooling Coefficient: A Standard to Define Heat Rejection from Lithium-Ion Batteries

The Cell Cooling Coefficient: A Standard to Define Heat Rejection from Lithium-Ion Batteries

A review of safety considerations for batteries in aircraft with electric propulsion

From material properties to multiscale modeling to improve lithium-ion energy storage safety

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