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The difference between rechargeable lithium ion battery and lithium polymer battery:

1. Lithium battery and lithium-ion battery (polymer is also lithium-ion battery). Lithium battery is a kind of cathode material made of lithium metal or lithium alloy. Due to the very active chemical characteristics of lithium metal, the processing, storage and use of lithium metal have very high environmental requirements.

2. The negative pole of lithium-ion battery is made of graphite and other intercalated structural materials. The lithium ion in the battery moves between the positive and negative poles, so it is much safer than the lithium battery.

3. For lithium ion batteries and lithium polymer batteries, the electrolyte of lithium ion batteries is liquid, and the electrolyte of polymer batteries is gel or solid, which is safer.

4. Lithium polymer battery box Lithium batteries are slightly different in packaging. Generally, lithium batteries are made of steel shell (18650 or button 2320), while lithium polymer batteries are packaged with aluminum plastic packaging film, that is, soft package batteries.

lithium battery

1. It has higher energy-weight ratio and energy-volume ratio;

2. High voltage. The voltage of a single lithium battery is 3.6V, which is equal to the series voltage of three nickel-cadmium or nickel-hydrogen rechargeable batteries;

3. Self-discharge is small and can be stored for a long time, which is the most prominent advantage of the battery;

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 service life. Under normal working conditions, the number of lithium battery charging/discharging cycles is far greater than 500;

6. It can be charged quickly. Lithium batteries can usually be charged with a current of 0.5~1 times the capacity, which can shorten the charging time to 1~2 hours;

7. It can be used in parallel at will;

8. Because the battery does not contain heavy metal elements such as cadmium, lead and mercury, it has no pollution to the environment, and is the most advanced green battery in the contemporary era;

Lithium ion battery

1. High voltage, the working voltage of single battery is up to 3.6-3.9V, which is three times of that of Ni-Cd and Ni-H batteries.

2. The specific energy is large. At present, the actual specific energy that can be achieved is 100-125Wh/kg and 240-300Wh/L (twice as much as Ni-Cd and 1.5 times as much as Ni-MH). In the future, with the development of technology, the specific energy can be as high as 150Wh/kg and 400Wh/L.

3. The cycle life is long, which can generally reach more than 500 times, or even more than 1000 times. For electrical appliances with small current discharge, the service life of the battery will double the competitiveness of the electrical appliances.

4. Good safety performance, pollution-free and memory-free. As the predecessor of Li-ion, the lithium battery is easy to form dendrites and short circuit, which reduces its application field: Li-ion does not contain cadmium, lead, mercury and other elements that pollute the environment. A major disadvantage of some processes (such as sintered) Ni-Cd battery is "memory effect", which seriously restricts the use of the battery, but Li-ion does not have this problem at all.

5. Low self-discharge. The self-discharge rate of fully charged Li-ion stored at room temperature for one month is about 10%, which is much lower than 25-30% of Ni-Cd and 30-35% of Ni and MH.

6. It can be charged and discharged quickly. The capacity of 1C charging can reach more than 80% of the nominal capacity.

7. The operating temperature range is high, and the operating temperature is - 25~45 ° C. With the improvement of electrolyte and positive electrode, it is expected to expand to - 40~70 ° C.

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