1. Battery aging: After multiple charge and discharge cycles, the chemical substances inside the
lithium battery will gradually undergo irreversible changes. For example, the structure of the electrode material may be damaged when lithium ions are embedded and deembedded between the positive and negative electrodes. Taking the common lithium cobalt oxide cathode material as an example, with the increase of the number of cycles, the crystal structure of lithium cobalt oxide may collapse, resulting in a decrease in the storage and release capacity of lithium ions, thus reducing the battery capacity and reducing the battery life.
2. The impact of ambient temperature: the performance of lithium batteries is more sensitive to temperature. At low temperatures, the viscosity of the electrolyte inside the battery increases and the ion conduction speed slows down. For example, in the environment below 0 ° C, the diffusion rate of lithium ions in the electrolyte may be reduced to a fraction of that at room temperature, which makes the discharge performance of the battery decrease and the battery life is significantly shortened. In the high temperature environment, although the ion conduction speed is accelerated, too high temperature will accelerate the side reactions inside the battery, such as the decomposition of the electrolyte and the chemical reaction between the electrode material and the electrolyte, resulting in the attenuation of the battery capacity.
3. Excessive discharge: If the lithium battery often overdischarge, that is, the battery power is used at a very low level (such as less than 20%), it will cause damage to the battery. When the battery voltage is too low, the negative electrode material inside the battery may have an irreversible chemical reaction with the electrolyte, forming a passivation film, preventing the embedding and deembedding of lithium ions, and thereby reducing the capacity and endurance of the battery.
solution
1. Reasonable use: try to avoid recharging the battery when the battery is too low, and charge can be carried out when the remaining power is about 20%-30%. At the same time, reduce the number of deep charge and discharge of the battery, for example, do not fill the battery every time or use the power to run out.
2. Control the ambient temperature: minimize the use of lithium battery equipment in a low temperature environment, or properly insulate the equipment. If used in a high temperature environment, pay attention to avoid long-term exposure to high temperature sources such as sunlight, and let the device dissipate heat in a suitable temperature environment after use.
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