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 properties of lithium metal, the processing, preservation and use of lithium metal have very high requirements for the environment.
The negative electrode of lithium-ion battery is made of intercalation materials such as graphite. In the battery, lithium ions move between the positive and negative electrodes, so it is much safer than lithium battery.
Lithium ion battery and lithium polymer battery. The electrolyte of lithium ion battery is liquid, and the electrolyte of polymer battery is gel or solid, which is safer.
Lithium polymer battery box lithium battery is slightly different in packaging. Lithium battery is generally made of steel shell (18650 or button 2320), while lithium polymer battery is packaged with aluminum plastic packaging film, that is, soft pack battery.
lithium battery
It has higher energy weight ratio and energy volume ratio;
The voltage is high. 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;
Self discharge is small and can be stored for a long time, which is the most prominent advantage of the battery;
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;
Long service life. Under normal working conditions, the number of charge / discharge cycles of lithium battery is much greater than 500;
It can be charged quickly. Lithium batteries can usually be charged with a current of 0.5 ~ 1 times the capacity, so that the charging time can be shortened to 1 ~ 2 hours;
It can be used in parallel at will;
Because the battery does not contain heavy metal elements such as cadmium, lead and mercury, it is the most advanced green battery in modern times;
Lithium ion battery
High voltage, the working voltage of single battery is as high as 3.6-3.9v, which is three times that of Ni-Cd and Ni-H batteries.
The specific energy is large. At present, the actual specific energy that can be achieved is 100-125wh / kg and 240-300wh / L (twice 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 400 wh / L.
Long cycle life, generally more than 500 times, or even more than 1000 times For electrical appliances with low current discharge, the service life of the battery will double the competitiveness of the appliance.
Good safety performance, no pollution, no memory effect As the predecessor of Li ion, lithium battery is easy to form dendrite and short circuit due to metal lithium, which reduces its application field: Li ion does not contain elements that pollute the environment such as cadmium, lead and mercury; a major disadvantage of Ni Cd battery in some processes (such as sintering type) is "memory effect", which seriously restricts the use of battery, but Li ion does not have this problem at all.
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.
It can be charged and discharged quickly, and the 1C charging capacity can reach more than 80% of the nominal capacity.
The working temperature range is high, and the working temperature is - 25 ~ 45 ° C. with the improvement of electrolyte and positive electrode, it is expected to be widened to - 40 ~ 70 ° C.