What Types Of Lithium Cells Are Most Susceptible To Drift?

Types of Lithium Cells Prone to Drift

Drift, or the gradual shift in a battery’s internal resistance and capacity, is a common issue that affects various lithium cell chemistries. However, some types are more susceptible to drift than others. Lithium Iron Phosphate (LiFePO4) cells, for example, are prone to drift due to their unique chemistry, which can lead to a gradual increase in internal resistance over time. This results in reduced battery capacity and efficiency, making them less ideal for high-power applications.

Factors Contributing to Drift

Several factors contribute to drift in lithium cells, including high temperatures, deep discharging, and overcharging. However, even when following proper charging and discharging practices, lithium cells can still drift due to internal chemical reactions and material degradation. In the case of LiFePO4 cells, drift can occur even when operating within the recommended temperature range of -20°C to 45°C. To mitigate this issue, manufacturers often implement advanced battery management systems (BMS) that can detect and adapt to changes in internal resistance.

Mitigating Drift in Lithium Cells

While some drift is inevitable in lithium cells, there are techniques to minimize its effects. Proper storage and handling practices, such as keeping batteries in a cool, dry place and avoiding deep discharging, can help slow down drift. Additionally, using a BMS with advanced algorithms can help detect and compensate for changes in internal resistance, ensuring optimal battery performance and extending its lifespan. For applications requiring high power and efficiency, alternative battery chemistries, such as Lithium Cobalt Oxide (LiCoO2) or Lithium Nickel Cobalt Aluminum Oxide (NCA), may be more suitable.