Fast charging refers to charging a battery at 1C or higher rates, significantly reducing the time it takes to reach full capacity. In practice, a typical fast charge might bring a smartphone battery from near empty to ~80% in under 30 minutes, or charge an electric vehicle to 80% in 20-30 minutes (depending on the technology). The ability to fast charge is limited by how quickly lithium ions can be inserted into the anode without causing issues like lithium plating, where lithium deposits on the anode surface instead of inserting into it, which can cause capacity loss and safety risks. It’s also limited by heat generation – fast charging can heat a cell, so thermal management is important. Batteries and chargers communicate (using protocols) to ensure the charge rate is adjusted based on cell temperature and voltage to avoid pushing the battery too hard beyond safe limits.
NOVONIX conducts research into fast charging by analyzing how different battery materials and designs handle high current inputs. Through charge rate mapping, they test cells at various charging rates (1C, 2C, 5C, etc.) to see how it affects capacity, internal resistance, and long-term cycle life. NOVONIX uses tools like Ultra High Precision Coulometry (UHPC) and post-mortem analysis to detect early signs of lithium plating or other fast-charge-related degradation. If a new anode material or electrolyte additive can suppress such degradation, NOVONIX’s tests will highlight that. Additionally, NOVONIX’s work with some clients may involve developing protocols – e.g., a specific charging profile that steps down current at certain points to maximize speed while protecting the battery. By optimizing both the chemistry and the charging strategy, NOVONIX aims to enable batteries that charge significantly faster without sacrificing longevity or safety.
