Systematic Assessment of Coulombic Efficiency in Anode‐Free and Lithium Metal Batteries
Mingzhu Guan, Zengwu Wei, Rui Liu, Xufeng Yan +6
AI summary
75% confidenceThis study addresses the reproducibility challenges in measuring Coulombic Efficiency (CE) for Lithium metal and anode-free batteries by systematically evaluating three distinct methodologies. It identifies critical factors such as electrolyte composition, concentration, and electrode surface properties that significantly influence CE variations. The research concludes that a pre-cycling Li reservoir method is superior for minimizing substrate effects and ensuring sensitive measurements across diverse conditions.
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Abstract
Driven by the demand for high‐energy‐density storage, Lithium metal batteries (LMBs) and anode‐free Lithium metal batteries (AFLMBs) have attracted significant attention due to their high theoretical capacity and low reduction potential. However, achieving reproducible Coulombic Efficiency (CE) measurements remains a challenge due to inconsistencies in electrochemical protocols and experimental conditions. This study systematically evaluates and compares three CE measurement methodologies, identifying key factors that influence reproducibility and accuracy. Unlike previous studies, which often report CE values without considering their methodological limitations, the impact of electrolyte composition, electrolyte concentration, and electrode surface properties are highlighted on CE variations. Furthermore, this study demonstrates that a pre‐cycling Li reservoir method effectively minimizes substrate effects, leading to the most sensitive measurements across various testing conditions. This work provides a standardized framework for CE evaluation in LMBs and AFLMBs, offering valuable insights for optimizing Li‐free anode interfaces and accelerating the commercialization of high‐performance LMBs.
Key findings
- Inconsistencies in electrochemical protocols and experimental conditions currently hinder the reproducibility of CE measurements in LMBs and AFLMBs.
- Electrolyte composition, concentration, and electrode surface properties are key determinants of CE variations that are often overlooked in previous reports.
- The pre-cycling Li reservoir method effectively minimizes substrate effects, providing the most accurate and sensitive CE measurements.
Keywords
Identifiers
- PubMed
- 40599129
- Journal
- Small Methods
- Year
- 2025