Several misunderstandings about lithium batteries
Due to insufficient understanding of lithium-ion batteries, many people have the following misunderstandings about lithium-ion batteries:
1. The higher the discharge platform, the better
The discharge platform usually refers to the discharge time (in minutes) when the battery voltage reaches 3.6V at 1C discharge. There are many factors that affect the platform time, such as discharge temperature, battery capacity, battery structure, diaphragm characteristics, electrolyte ratio, active material ratio, manufacturing process, battery quality, etc.; sometimes people will give up some other battery properties in pursuit of a high platform, such as using materials with smaller particle size and thinner diaphragms, which leads to reduced safety. Therefore, the appropriate platform time should be determined according to the actual use requirements of the electrical appliances;
2. The smaller the internal resistance of the battery, the better the battery performance
The internal resistance of the battery is the sum of the impedances of all battery components, including electronic conductor resistance (including contact resistance, conductor resistance), ion conductor resistance (including electrolyte resistance, diaphragm resistance, ion migration / diffusion resistance in the active material layer), semiconductor impedance (including positive and negative electrode material impedance), capacitive impedance, inductive impedance, etc. Due to the differences in design structure, material characteristics, production process, etc. of each manufacturer, the internal resistance of the battery is also very different. The internal resistance of the battery is also greatly affected by the ambient temperature, so the performance of the battery cannot be judged only by the internal resistance.
3. The higher the battery capacity, the better
High battery capacity can provide more energy for electrical appliances; but at the current technical level, many companies sacrifice battery safety to increase battery capacity, which brings risks to end users. Therefore, it is recommended that users choose batteries with common market capacity and avoid choosing high-capacity batteries.
4. Charge the battery only when it is empty
During the charging and discharging process of lithium-ion batteries, the volume of positive and negative electrode materials changes with the degree of charge saturation. Deep charging and deep discharging will cause the volume of battery materials to expand and contract greatly, affecting the cycle life of the battery. It is recommended to charge the battery when it has discharged 70% of its capacity, which can effectively extend the battery life.
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