Charge endpoint slippage occurs due to electron donating and consuming reactions at the electrode surfaces which are not associated with reversible lithium storage. For example, during charge, electron donating reactions such as electrolyte oxidation and Mn dissolution cause charge imbalance, requiring excess electrons to be counted through the external (cell tester) circuit, adding a small amount of charge capacity. During discharge, these processes create charge balance by means of internal self-discharge, subtracting from the discharge capacity. This imbalance of charge and discharge capacity due to these “slippage” based mechanisms contributes to the Coulombic Efficiency of a cell. Charge Endpoint Capacity Slippage is a lesser known and appreciated cell metric than Capacity Fade due to being extremely difficult to measure on standard cell testing equipment. UHPC is required to accurately and consistently measure Charge Endpoint Capacity Slippage. NOVONIX examines charge end-point capacity slippage as part of its high-precision battery testing regimen. These valuable data, combined with other diagnostics, help NOVONIX identify specific degradation mechanisms in new battery chemistries and reduce development lifecycles for its customers and internal programs. Through such insights, NOVONIX assists in refining materials to minimize these degradation effects, thereby improving battery longevity.
