Summarize of polymer lithium-ion polymer batteries
Lithium Ion batteries are divided into Liquid lithium-ion Battery (LIB) and Polymer Lithium-ion Battery (PLB), depending on the electrolyte materials used. The anode and cathode materials used in the polymer lithium ion battery are the same as the liquid lithium ion. The anode materials are divided into lithium cobalt acid, lithium manganese acid, ternary materials and lithium iron phosphate materials. The cathode is graphite. The important difference is the difference in electrolytes. Liquid lithium-ion batteries use a liquid electrolyte, while polymer lithium-ion batteries use a solid polymer electrolyte, which can be either dry or colloidal.
(1) Solid polymer electrolyte lithium ion battery
The electrolyte is a mixture of polymer and salt. The battery has low ionic conductivity and can be used at room temperature.
(2) Gel polymer electrolyte lithium ion battery
That is to add plasticizer and other additives in solid polymer electrolyte, so as to improve ionic conductivity, so that the battery can be used at room temperature.
(3) Lithium ion batteries made of polymer positive electrode materials
Conductive polymer is used as positive electrode material, its specific capacity is relatively increased. Because solid electrolyte replaces liquid electrolyte, compared with liquid lithium ion battery, polymer lithium ion battery has the advantages of thinness, arbitrary area and arbitrary shape, etc. Therefore, aluminum-plastic composite film can be used to make the battery shell, so as to improve the specific capacity of the whole battery. Polymer lithium ion battery can also use polymer as a positive electrode material, its mass specific energy will be more than 20% higher than the current liquid lithium ion battery. Lithium-ion Polymer Battery has the characteristics of miniature, thin and lightweight. As a result, LI-polymer batteries will have a growing market share.
Matters needing attention
1.Pay attention to short circuit condition
Lithium Polymer batteries are prone to short circuits during charging. It includes internal short circuit, external short circuit, etc.
Today, though, most lithium-ion batteries have protective circuits against short circuits. And explosion-proof wires. But in a lot of cases, this circuit is not going to work in a lot of situations.
Explosion-proof wire can be used, but also very limited.
2. Do not overcharge
Polymer lithium ion battery, if, charging time is too long, the possibility of expansion will increase.
Lithium is very active and easy to burn. When the battery is charged and discharged, the internal temperature of the battery will continue to rise, and the gas expansion in the activation process will increase the pressure inside the battery to a certain extent. If there is a scar on the shell, it will burst, causing leakage, fire and even explosion. Lithium-ion polymer batteries, on the other hand, only expand.
We must pay attention to safety when using.