Decoupling pressure effects in plating and stripping of lithium metal anodes

Zhang, Yuxiao; Li, Ke; Li, Yunfan; Shen, Weijia; Qu, Xinyi; Huang, Jundi; Lin, Yixin

doi:10.1016/j.est.2023.109422

Cited by 1 publication

(1 citation statement)

References 48 publications

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“…42 It is also important to consider the effect of coin cell encapsulation pressure during long-term cycling, which can significantly impact Li deformation during charging/discharging and ultimately irreversible capacity losses. 56,57 Based on the thicknesses of the electrodes and inert coin cell components, the cell volume expansion during cycling, and the displacement/force of the wave spring, the pressure can be roughly estimated as 0.19 MPa at the beginning of cycling, with a fluctuation of approximately 0.01 MPa during charge/discharge volume changes (see Fig. 9a and the Supplementary Material for more details).…”

Section: Resultsmentioning

confidence: 99%

Magnetic Force Dilatometry for Operando Coin Cell Electrochemical Dilation Measurements

Osad,

Reese,

Sayed

et al. 2024

J. Electrochem. Soc.

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Operando characterization of the physical and chemical changes occurring within batteries during electrochemical cycling has become a powerful tool for next generation technology development. In particular, a better understanding of the expansion (dilation) behavior of active materials during charge/discharge is critical for mitigating performance degradation, particularly for high expansion materials like Li or Si. However, current dilatometry devices rely on direct mechanical coupling or line-of-sight measurements with pouch- or custom-cells, which prohibits their use in the most common and accessible research battery format: coin cells. To this end, we propose a novel magnetic force dilatometry (MFD) technique for operando electrochemical dilation measurements. Our custom low-cost dilatometer utilizes magnetic force sensing for contactless expansion measurements via facile replacement of the austenitic spacer with a ferritic spacer within a coin cell. To validate this setup, we demonstrate operando electrochemical dilatometry of a LiNi0.6Mn0.2Co0.2O2 (NMC622) || Li metal full cell in a CR2032 format. Our MFD accurately captures cell expansion/contraction with sensitivities of less than 0.1 μm, and reliability for over hundreds of hours and cycles. This new MFD method is expected to increase the accessibility of electrochemical dilatometry by eliminating the need for pouch cells or other specialized cell expansion measurement configurations.

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Section: Resultsmentioning

confidence: 99%