How does lithium thionyl chloride last so long? A key part of this behaviour is passivation. When lithium metal comes into contact with the electrolyte, a thin protective layer forms on its surface.
This layer slows further reactions between the lithium and the electrolyte. As a result, less active material is consumed while the battery sits unused, helping preserve its stored energy.
The Chemistry Also Has High Energy Density
The chemistry also has high energy density, so a relatively small cell can contain enough energy to power a low-consumption device for many years.
This is valuable in equipment such as remote meters, sensors, and industrial monitors, where visiting the site to replace a battery may be difficult or costly.
Actual Life Depends On Average Current Draw,
However, a long shelf-life figure on a datasheet is not a guarantee that every battery will last that long in service. So why does lithium thionyl chloride last so long?
Actual life depends on the device’s average current draw, the frequency and size of current pulses As well as operating temperature, storage conditions, cell size, and the equipment’s minimum acceptable voltage.
High Temperatures Accelerate Unwanted Reactions
High temperatures generally accelerate unwanted reactions, while cold conditions can reduce the cell’s ability to deliver current. Passivation can also cause a temporary voltage delay after storage, particularly when the device demands a sudden current.
The battery’s age and manufacturing quality matter as well. Users should check the manufacturer’s specified storage life, operating limits, and discharge data. Rather than relying on a general claim that all cells last for a fixed number of years.
These Are Primary Batteries And Must Not Recharge
These are primary batteries and must not be recharged. Attempting to recharge them can cause dangerous reactions. Choosing a suitable cell and designing the equipment for its actual load are essential to achieving long service life.
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