Will the performance of polymer lithium-ion battery cells change after being left for a long time?
Publish Time: 2025-03-25
As an indispensable energy source in modern electronic devices, the performance changes of polymer lithium-ion battery cells after being left for a long time have always been the focus of attention inside and outside the industry. This battery has been widely used in portable electronic devices, electric vehicles and energy storage systems due to its high energy density, long cycle life and small volume-to-weight ratio. However, when polymer lithium-ion battery cells are not used for a long time, their performance may indeed be affected to a certain extent.First, polymer lithium-ion battery cells that have been left for a long time may experience a self-discharge process. Self-discharge is the phenomenon that the internal chemical reaction of the battery in the open circuit state causes the power to gradually decrease. Although all lithium-ion batteries have self-discharge, the self-discharge rate of polymer lithium-ion batteries may vary depending on the battery state, storage conditions and battery manufacturing quality due to their unique electrolyte and material structure. After being left for a long time, if the battery power is too low, it may cause irreversible capacity loss, which will affect the battery life.Secondly, the positive and negative electrode materials of polymer lithium-ion battery cells may be passivated after being stored for a long time. Passivation refers to the formation of a thin film on the surface of the battery material that hinders charge transfer, resulting in a decrease in the efficiency of the chemical reaction inside the battery, thereby affecting the battery's discharge capacity. This passivation phenomenon may be related to factors such as the chemical reaction inside the battery, the decomposition of the electrolyte, and the storage environment. Passivated batteries may take longer to activate when recharging and discharging, and may not even be able to recover to their original performance level.In addition, the electrolyte of polymer lithium-ion battery cells may also decompose after being stored for a long time. The electrolyte is a key component of the chemical reaction inside the battery, and its stability is crucial to the battery performance. However, long-term storage may cause certain components in the electrolyte to decompose and generate substances that are harmful to the battery performance. These harmful substances may reduce the battery's discharge capacity, increase the battery's internal resistance, and even cause safety problems such as battery short circuits.In order to slow down the performance degradation of polymer lithium-ion battery cells after long-term storage, the following measures are recommended: first, store the battery in a dry and cool environment to avoid high temperature and humidity that accelerate the self-discharge and chemical reaction of the battery; second, charge the battery regularly to maintain the battery power within an appropriate range to avoid irreversible capacity loss caused by low power; finally, use a regular charger that matches the battery to ensure the safety and efficiency of the charging process.In summary, the performance of polymer lithium-ion battery cells may indeed change after long-term storage. However, through reasonable storage conditions and regular maintenance management, we can effectively slow down this performance degradation and extend the service life of the battery.
