Overview of the characteristics of lithium-ion polymer batteries
According to the different electrolytic materials used in lithium-ion batteries, lithium-ion batteries can be divided into liquid lithium-ion batteries (lithium-ion batteries). ion, abbreviated LIB) and lithium polymer batteries. There are two categories of ionic batteries (lithium-ion polymer batteries, called LIP). The positive and negative electrode materials used in polymer lithium ion batteries are the same as liquid lithium ions, and the working principle of the battery is basically the same. The main difference between them is the electrolyte. Lithium-ion batteries use liquid electrolytes, while lithium-ion polymer batteries use solid polymer electrolytes instead. This polymer can be “dry” or “glue”, currently most use colloidal polymer electrolytes. . Lithi batteriesum-ion polymer batteries can be divided into three categories:
(1) Solid polymer electrolyte lithium-ion batteries. The electrolyte is a mixture of polymer and salt. This battery has low ionic conductivity at room temperature and is suitable for use at high temperatures.
(2) Lithium-ion battery with gel polymer electrolyte. That is, additives such as plasticizers are added to the solid polymer electrolyte to increase the ionic conductivity so that the battery can be used at room temperature.
(3) Lithium-ion batteries with polymer cathode materials. Using a conductive polymer as the cathode material, its specific energy is three times that of existing lithium-ion batteries. This is the latest generation of lithium-ion batteries. Due to the use of solid electrolytes instead of liquid electrolytes, compared to liquid lithium-ion batteries, lithium batteriesum-ion polymer have the advantage of being thinner, any area and any shape, and will not cause safety problems such as leakage, combustion. , and explosions. Therefore, the battery shell can be made of aluminum-plastic composite film, which can increase the specific capacity of the entire battery; lithium-ion polymer batteries can also use polymers as cathode materials, and their mass specific energy will be. higher than current liquid lithium-ion batteries. Improved by over 50%. In addition, lithium-ion polymer batteries are better than lithium-ion batteries in terms of operating voltage, charge and discharge cycle life, etc. Based on the above advantages, lithium-ion polymer batteries are hailed as the next generation of lithium-ion batteries.
What is the difference between polymer batteriesand lithium-ion polymer batteries?
According to the different electrolyte materials used in lithium-ion batteries, lithium-ion batteries can be divided into liquid lithium-ion batteries (lithium-ion batteries), LIB for short) and lithium-ion polymer battery (lithium-ion polymer battery, LIP for short).
The positive and negative electrode materials used in polymer lithium ion batteries are the same as liquid lithium ions, and the working principles of the batteries are basically the same. The main difference between them is that lithium-ion batteries use a liquid electrolyte, while lithium-ion polymer batteries use a colloidal polymer electrolyte instead.
Compared with liquid lithium-ion batteries, polymer lithium-ion batteries are not only safer, but also thinner, arbitrary area and arbitrary shape, etc. The outer shell also usesa lighter aluminum-plastic composite film. However, its low temperature discharge performance can still be improved.
The performance of these two lithium batteries is therefore similar, and there is no obvious difference. These are ordinary lithium batteries, which are different from the power batteries used in electric vehicles, the latter being much better.
How to distinguish lithium batteries from lithium polymer batteries
Mass-produced lithium ion batteries include liquid lithium ion (LiB) batteries and lithium-ion polymer batteries. Batteries (LiP) of two types. So in many cases, if the battery is marked Li-ion, it must be a lithium-ion battery. But it is not necessarily a liquid lithium ion battery, it can also be a polymer lithium ion battery.
The lithium-ion battery is an improved productfrom the lithium battery. Lithium batteries have been around for a long time, but lithium is a very active metal and is not very safe to use. It often burns and explodes when charging. Later, improved ingredients may inhibit the activity of lithium-ion batteries. Lithium elements (such as cobalt, manganese, etc.) are added to make lithium batteries truly safe, efficient and practical.
Old lithium batteries have also been virtually eliminated. As for how to distinguish them, they can be identified by the battery logo. Lithium batteries are Li and lithium ion batteries are Li-ion. Nowadays, “lithium batteries” used in laptops and cell phones are actually lithium-ion batteries.
The basic structure of a modern battery consists of three elements: a positive electrode, a negative electrode and an electrolyte. As a battery type, lithium-ion batteries also have all three of these elements. Typical lithium-ion technology uses liquid or inorganic colloidal electrolytes and therefore requires a robust housing to contain the flammable active ingredients.
The so-called lithium-ion polymer battery uses polymer materials as the main battery system in at least one or more of the three main structures.
Lithium-ion batteries and lithium-polymer batteries can be distinguished on the battery packaging label. Lithium-ion batteries are usually labeled Li-ion and lithium-polymer. Batteries are usually marked with the word Li. Polymer, as shown below. At the same time, because the electrolyte of lithium polymer batteries is gel-like, there are fewer problems with electrolyte leakage, so most of them are soft aluminum packaging.ium-plastic.
Lithium polymer batteries have the same chemical properties as liquid lithium ion batteries, and even the internal structure is the same. This is a new type of battery developed on the basis of liquid lithium-ion batteries, and. is similar to liquid lithium-ion batteries. Compared with lithium-ion polymer batteries, they have the following advantages:
Good safety performance, will not explode
Can be made into various shapes
Compared to the same steel-cased lithium batteries and lighter aluminum-cased lithium batteries?
The capacity is generally higher than that of steel-cased lithium batteries and lithium batteries with aluminum housing of the same specifications?
The internal resistance is low, so the battery capacity can be maximized.
Good performance at high temperatures, no bulge at 85℃ for 4 hours
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Cycling performance, battery capacity,The internal resistance has good consistency.