Dynamics and characteristics of thin film batteries cycled over capacitive load

Teichert, Kendall; Oldham, Kenn R.

doi:10.1109/aim.2016.7577000

Cited by 3 publications

(9 citation statements)

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“…Details of experimental setup and findings were reported elsewhere demonstrating the importance of consideration of these losses. 19 Key findings are summarized here.…”

Section: Modeling Developmentmentioning

confidence: 99%

“…H-bridge switching circuitry for experimental testing. Reprinted with permission, 19 and based on the circuit presented by others. 29 Timescale considerations: It is noted that timescales of the capacitor charging, battery dynamics, and switching characteristics can be very similar and therefore may all need to be addressed during individual cycle modeling (e.g.…”

Section: A362mentioning

confidence: 99%

“…Again for more information on experimental setup and results see our prior work. 19 The main switching events, common in many switching circuits, included the following (shown graphically in Figure 2):…”

Section: A362mentioning

confidence: 99%

“…Recently we experimentally showed effects of switching capacitive loads on voltage profiles of battery outputs. 19 That work highlighted various phenomena related to the loading and circuitry, and presented a brief demonstration of one cycle of this modeling approach without modeling details. Here we detail the incorporation of key phenomena into a full switching model to capture effects of cyclic capacitive loading on thin-film batteries.…”

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confidence: 99%

“…This model was based heavily on work presented by Fabre et al 2 and Danilov et al 20 and more detailed descriptions of the electrochemical equations can be found there, as well as prior work by Thomas et al 21 This basic model foundation was then adapted for our loading conditions as well as to include switching and other phenomena seen experimentally. 19 Model parameters were found using a fitting optimization approach that was developed to correlate the model with experimental data. Meanwhile, to model faster timescale dynamics of cycling requires a significant numerical cost.…”

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Modeling Cyclic Capacitive Loading of Thin-Film Batteries

Teichert

Oldham

2017

J. Electrochem. Soc.

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Previous modeling of thin-film batteries has primarily looked at simple discharge loads. This work examines modeling of midfrequency dynamic loads with large variation in current during repetitive loading cycles, a type of loading that is very common in microelectromechanical system (MEMS) applications. Here we show an extension of traditional modeling of thin-film batteries to account for switching and capacitive loading representing piezoelectric or electrostatic microactuation. This model captures behavior at both fast and slow timescales, including effects of short-duration, high-current spikes. We show validation of the model and introduce a cycle projection scheme that allows for over 94% reduction in numerical calculations over a full battery discharge which includes over a million cycles. © The Author(s) 2017. Published by ECS. This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 License (CC BY, http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse of the work in any medium, provided the original work is properly cited. [DOI: 10.1149/2.1141702jes] All rights reserved.Manuscript submitted October 6, 2016; revised manuscript received December 2, 2016. Published January 5, 2017.Limitations of available power sources, such as batteries, place significant constraints on design of engineered systems at many scales, from vehicles to microelectromechanical systems (MEMS).1 Battery modeling can be used to help navigate these limitations, and many different modeling approaches have been developed. 2,3 This work focuses on adapting existing modeling approaches to capture cyclic, capacitive loading (i.e. repeated charging of a load that behaves approximately like a capacitor) of thin-film batteries, a loading which is very common in, for example, MEMS applications. Additionally, for small-scale systems, all-solid-state batteries are an attractive alternative to more traditional liquid electrolyte constructs in that sealing of the liquid electrolyte is avoided, 4 generally providing better size and assembly compatibility with micromachined devices. These solid electrolytes typically have lower ionic conductivities, but the effects of this are mitigated by the reduced thickness at which these thin films can be deposited.5 Various studies have looked at the different properties of various battery chemistries and configurations, [5][6][7][8][9][10][11][12] which is still a very active area of research. However, modeling of cyclic capacitive loads seems to be lacking in the literature.Understanding the implications of cyclic loading on batteries is important. There have been mixed reports on the broader loading category of intermittent loads on batteries at various scales. Several reports have indicated that loading conditions can have substantial effects on the battery output ability. Fuller et al.13 discussed different relaxation phenomena in lithium-ion insertion batteries. Feeney et al.14 recently demonstrated, on a specific primary Li-ion battery...

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“…Details of experimental setup and findings were reported elsewhere demonstrating the importance of consideration of these losses. 19 Key findings are summarized here.…”

Section: Modeling Developmentmentioning

confidence: 99%

Section: A362mentioning

confidence: 99%

Section: A362mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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