Studies on LiFePO4 as cathode material using impedance spectroscopy

Schmidt, Jan Philipp; Chrobak, Thorsten; Ender, Moses; Illig, Jörg; Klotz, Dino; Ivers-Tiffée, Ellen

doi:10.1016/j.jpowsour.2010.09.121

Cited by 363 publications

(272 citation statements)

References 25 publications

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“…The AR-ECM, which represents one of the most widely applied ECM in the literature [7], [14] - [16], is employed in this study. Figure 1B) illustrates that the AR-ECM is composed of a voltage source connected in series with a resistor, an inductor and resistor and Constant Phase Elements (CPEs) parallel branches.…”

Section: A Eis Techniquementioning

confidence: 99%

Identification and quantification of ageing mechanisms in Lithium-ion batteries using the EIS technique

Pastor-Fernández

Widanage

Marco

et al. 2016

2016 IEEE Transportation Electrification Conference and Expo (ITEC)

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Section: A Eis Techniquementioning

confidence: 99%

Identification and quantification of ageing mechanisms in Lithium-ion batteries using the EIS technique

Pastor-Fernández

Widanage

Marco

et al. 2016

2016 IEEE Transportation Electrification Conference and Expo (ITEC)

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“…While theoretical formulae of the BD impedance have been derived for a thin film electrode and nanoparticle electrodes with some model particle geometries [2,6,12,13,15,16], they have not been widely applied by experimentalists. In most applications, only the original Warburg impedance model and an one-dimensional BD impedance model have been exclusively used without considering the actual curved particle shape and particle size distribution in interpreting diffusion impedance [7][8][9][10][17][18][19]. Likewise, only these two models are built into commercial data-processing software products (e.g.…”

Section: Introductionmentioning

confidence: 99%

Effects of Nanoparticle Geometry and Size Distribution on Diffusion Impedance of Battery Electrodes

Song¹,

Bazant

2012

J. Electrochem. Soc.

231

195

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The short diffusion lengths in insertion battery nanoparticles render the capacitive behavior of bounded diffusion, which is rarely observable with conventional larger particles, now accessible to impedance measurements. Coupled with improved geometrical characterization, this presents an opportunity to measure solid diffusion more accurately than the traditional approach of fitting Warburg circuit elements, by properly taking into account the particle geometry and size distribution. We revisit bounded diffusion impedance models and incorporate them into an overall impedance model for different electrode configurations. The theoretical models are then applied to experimental data of a silicon nanowire electrode to show the effects of including the actual nanowire geometry and radius distribution in interpreting the impedance data. From these results, we show that it is essential to account for the particle shape and size distribution to correctly interpret impedance data for battery electrodes. Conversely, it is also possible to solve the inverse problem and use the theoretical "impedance image" to infer the nanoparticle shape and/or size distribution, in some cases, more accurately than by direct image analysis. This capability could be useful, for example, in detecting battery degradation in situ by simple electrical measurements, without the need for any imaging.2

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“…In Equation (13), the first case is in the discharging process, the second case is in the charging process, and the final situation is in the rest mode.…”

Section: Battery Modelingmentioning

confidence: 99%

A New State of Charge Estimation Method for LiFePO4 Battery Packs Used in Robots

2013

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Abstract:The accurate state of charge (SOC) estimation of the LiFePO 4 battery packs used in robot applications is required for better battery life cycle, performance, reliability, and economic issues. In this paper, a new SOC estimation method, "Modified ECE + EKF", is proposed. The method is the combination of the modified Equivalent Coulombic Efficiency (ECE) method and the Extended Kalman Filter (EKF) method. It is based on the zero-state hysteresis battery model, and adopts the EKF method to correct the initial value used in the Ah counting method. Experimental results show that the proposed technique is superior to the traditional techniques, such as ECE + EKF and ECE + Unscented Kalman Filter (UKF), and the accuracy of estimation is within 1%.

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Studies on LiFePO4 as cathode material using impedance spectroscopy

Cited by 363 publications

References 25 publications

Identification and quantification of ageing mechanisms in Lithium-ion batteries using the EIS technique

Identification and quantification of ageing mechanisms in Lithium-ion batteries using the EIS technique

Effects of Nanoparticle Geometry and Size Distribution on Diffusion Impedance of Battery Electrodes

A New State of Charge Estimation Method for LiFePO4 Battery Packs Used in Robots

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