The difference between lithium-ion batteries and lithium polymer batteries in power banks:
1. Lithium batteries and lithium-ion batteries (polymer batteries are also lithium-ion batteries). Lithium batteries are a type of battery that uses lithium metal or lithium alloy as the negative electrode material. Due to the highly reactive chemical properties of lithium metal, the processing, storage, and use of lithium metal require very high environmental standards.
2. The negative electrode of a lithium-ion battery is made of intercalated materials such as graphite. Lithium ions move between the positive and negative electrodes in the battery, making it much safer than a lithium battery.
3. Lithium-ion batteries and lithium polymer batteries: lithium-ion batteries use liquid electrolytes, while polymer batteries use gel or solid electrolytes, making them safer.
4. Lithium polymer battery box: Lithium batteries differ slightly in packaging. Lithium batteries are generally packaged in steel casings (18650 or button-type 2320), while lithium polymer batteries are packaged in aluminum-plastic film, i.e., soft-pack batteries.
lithium batteries
1. It has a higher energy-to-weight ratio and energy-to-volume ratio;
2. High voltage: a single lithium battery has a voltage of 3.6V, which is equal to the voltage of three nickel-cadmium or nickel-metal hydride rechargeable batteries connected in series;
3. Low self-discharge allows for long-term storage, which is the battery's most outstanding advantage;
4. No memory effect. Lithium batteries do not have the so-called memory effect of nickel-cadmium batteries, so lithium batteries do not need to be discharged before charging;
5. Long lifespan. Under normal operating conditions, lithium batteries can withstand well over 500 charge/discharge cycles.
6. Fast charging is possible. Lithium batteries can typically be charged with a current of 0.5 to 1 times their capacity, reducing charging time to 1 to 2 hours;
7. Can be used in parallel at will;
8. Because the battery does not contain heavy metals such as cadmium, lead, and mercury, it does not pollute the environment and is the most advanced green battery available today;
Lithium-ion batteries
1. High voltage: The working voltage of a single cell is as high as 3.6-3.9V, which is 3 times that of Ni-Cd and Ni-H batteries.
2. High specific energy. The actual specific energy that can be achieved at present is 100-125Wh/kg and 240-300Wh/L (2 times that of Ni-Cd and 1.5 times that of Ni-MH). In the future, with the development of technology, the specific energy can be as high as 150Wh/kg and 400Wh/L.
3. Long cycle life, generally reaching over 500 cycles, or even over 1000 cycles. For appliances with low current discharge, the battery's lifespan will significantly increase the appliance's competitiveness.
4. Excellent safety performance, pollution-free, and no memory effect. As the predecessor of Li-ion batteries, lithium batteries have limited applications because metallic lithium is prone to dendrite formation and short circuits. Li-ion batteries do not contain elements such as cadmium, lead, and mercury that pollute the environment. A major drawback of Ni-Cd batteries produced by some processes (such as sintering) is the "memory effect," which severely restricts the use of the battery. However, Li-ion batteries do not have this problem at all.
5. Low self-discharge: The self-discharge rate of fully charged Li-ion after one month of storage at room temperature is about 10%, which is much lower than that of Ni-Cd (25-30%) and Ni and MH (30-35%).
6. It can be charged and discharged quickly; with 1C charging, the capacity can reach more than 80% of the nominal capacity.
7. It has a high operating temperature range of -25 to 45°C, and with improvements in the electrolyte and positive electrode, it is expected to be able to extend the range to -40 to 70°C.
