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• W4200204588 abstract "The galvanostatic intermittent titration technique (GITT), introduced in 1977 by Weppner and Huggins, provided a readily accessible means to measuring the chemical diffusion coefficient of electrochemical electrode materials. The method continues to be widely used today, but the reported diffusivity values are highly inconsistent, ranging as much as four orders of magnitude for some Li layered oxide compositions. Even qualitative trends of diffusivity are inconsistent, suggesting significant flaws in the implementation of the method. Other variants of the GITT method also suffer from similar inconsistency problems. Here we identify numerous sources of significant error including composition-dependent reaction overpotentials, mathematical flaws in the relaxation analysis methods, finite-size and non-planar geometry effects, inter-particle inhomogeneity issues, early transient effects, and surface area uncertainties. We propose a simple relaxation analysis scheme using the time variable <?CDATA $sqrt{{t}_{mathrm{relax}}+tau }-sqrt{{t}_{mathrm{relax}}}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:msqrt> <mml:mrow> <mml:msub> <mml:mrow> <mml:mi>t</mml:mi> </mml:mrow> <mml:mrow> <mml:mi>relax</mml:mi> </mml:mrow> </mml:msub> <mml:mo>+</mml:mo> <mml:mi>τ</mml:mi> </mml:mrow> </mml:msqrt> <mml:mo>−</mml:mo> <mml:msqrt> <mml:mrow> <mml:msub> <mml:mrow> <mml:mi>t</mml:mi> </mml:mrow> <mml:mrow> <mml:mi>relax</mml:mi> </mml:mrow> </mml:msub> </mml:mrow> </mml:msqrt> </mml:math> , where t relax is relaxation time and τ is the galvanostatic pulse duration. We also propose to use dense diffusion-limited samples to isolate the bulk-diffusion process in the time domain. Chemical diffusivity can be extracted much more reliably with this improved implementation of the GITT method." @default.
• W4200204588 created "2021-12-31" @default.
• W4200204588 creator A5050039741 @default.
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• W4200204588 date "2021-12-01" @default.
• W4200204588 modified "2023-09-26" @default.
• W4200204588 title "Galvanostatic Intermittent Titration Technique Reinvented: Part I. A Critical Review" @default.
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• W4200204588 doi "https://doi.org/10.1149/1945-7111/ac3940" @default.
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