Fig. 6: Implementing the hypothetical coulombic consumption mechanism with measurable parameters in Si-based Li-ion chemistries.
From: Deciphering coulombic loss in lithium-ion batteries and beyond
a Strong correlation of charge balance parameter (ip/in) via HpLC tests and the full cell performance indicator (ρf) via OCV-RPT tests, revealing the importance of charge inventory compensation mechanisms. b The ratio of steady leakage current between the positive and negative electrode is dependent of cell chemistries. The red arrow suggests the inventory deficit from more coulombic consumption at the negative electrode. The experimental validations of the hypothetical coulombic consumption mechanisms via (c) calendar aging tests and (d) cycling tests of nSi||NMC811a cell performance using large-format pouch cells. e The conceptual demonstration of having global charge inventory compensation to improve stable cycling performance by incorporating additional napping OCV steps in charge/discharge cycling after 10 formation cycles.
