Several classifications and precautions for polymer lithium-ion batteries

Lithium-ion batteries are classified into a liquid lithium ion battery (Liquified Lithium-Ion Battery, abbreviated as LIB) and a polymer lithium ion battery (Polymer Lithium-Ion Battery, abbreviated as PLB), depending on the electrolyte material used in the lithium ion battery. The positive and negative materials used in the polymer lithium ion battery are the same as the liquid lithium ions. The positive electrode material is divided into lithium cobaltate, lithium manganate, ternary material and lithium iron phosphate material, and the negative electrode is graphite. The working principle of the battery is also basically Consistent. The main difference is that the electrolyte is different. The liquid lithium ion battery uses a liquid electrolyte, and the polymer lithium ion battery is replaced by a solid polymer electrolyte. The polymer can be either "dry" or "colloidal", most of the current use of polymer colloidal electrolytes.

Classification

(1) Solid polymer electrolyte lithium ion battery

The electrolyte is a mixture of a polymer and a salt. The battery has a low ionic conductivity at normal temperature and can be used at normal temperature.

(2) Gel polymer electrolyte lithium ion battery

That is, an additive such as a plasticizer is added to the solid polymer electrolyte to increase the ionic conductivity, so that the battery can be used at normal temperature.

(3) Lithium ion battery for polymer cathode material

A conductive polymer is used as a positive electrode material, and its specific capacity is relatively increased. Since the solid electrolyte is used instead of the liquid electrolyte, the polymer lithium ion battery has the advantages of being thinner, arbitrarily aread, and arbitrarily shaped compared with the liquid lithium ion battery. Therefore, the battery casing can be fabricated from the aluminum-plastic composite film, thereby it can improve the specific capacity of the whole battery; the polymer lithium ion battery can also use the polymer as the positive electrode material, and its mass specific energy will be more than 20% higher than the current liquid lithium ion battery. A polymer lithium ion (PolymerLithium-IonBattery) battery is characterized by being compact, thin, and lightweight. Therefore, the polymer battery will gradually increase in the market.

Precautions

Pay attention to short circuit conditions

Polymer lithium-ion batteries are prone to short-circuit conditions during charging. Including, internal short circuit, external short circuit, and so on.

Although, most lithium-ion batteries now have protection circuits that are short-circuit proof. There are also explosion-proof lines. But in many cases, this circuit does not necessarily work in various situations.

The role of explosion-proof lines is also limited.

Do not overcharge the second charge

Polymer lithium-ion batteries, if the charging time is too long, the possibility of expansion will increase.

The chemical properties of lithium are very active and easy to burn. When the battery is charged and discharged, the inside of the battery continues to heat up. The gas generated during the activation process expands, the internal pressure of the battery increases, and the pressure reaches a certain level. If the outer casing is scratched, it will rupture, causes leakage, fire, or even explosion. Polymer lithium-ion batteries only expand.

When you are using it, be sure to pay attention to safety.

The page contains the contents of the machine translation.