Which is better, polymer battery or lithium battery? What is the difference between the two.
The concept of lithium battery is used very frequently. With a little attention, we will find that there are actually three differences between the broad sense, the narrow sense and the narrow sense. In a broad sense, lithium-ion batteries include lithium-ion batteries and lithium-ion batteries. Because lithium-ion batteries are more widely used than lithium-ion batteries, lithium-ion batteries usually refer to lithium-ion batteries in a narrow sense. There are two kinds of internal lithium-ion batteries: polymer lithium-ion batteries and liquid lithium-ion batteries. Because the quality of lithium-ion batteries is larger and the application is more liquid lithium-ion batteries, the lithium-ion batteries are narrow Li-ion battery is a kind of liquid lithium-ion battery, and polymer lithium-ion battery is also called lithium polymer battery, which is commonly referred to as polymer battery. If we compare the differences between lithium polymer battery and lithium battery in a broad sense and a narrow sense, the only thing is the relationship between the concept of species and the concept of genus. Lithium polymer battery is included in lithium battery. Therefore, the comparison in a narrow sense is of comparative significance: that is, the comparison between polymer battery and liquid lithium-ion battery. Based on this, the following lithium battery refers to liquid lithium-ion battery.
1. The fundamental difference is raw materials
This is the root of their different performances. Polymer battery refers to the use of polymer materials in at least one of the three major components of positive, negative or electrolyte. Macromolecule means high molecular weight, and its corresponding concept is small molecule. Macromolecule has high strength, high toughness and high elasticity. At present, polymer materials for polymer battery are mainly used for anode and electrolyte. ① In addition to the inorganic compound of lithium battery, the positive material of polymer battery can also be conductive polymer; ② the electrolyte of polymer battery includes polymer electrolyte (solid or colloidal) and organic electrolyte, and the electrolyte (liquid or colloidal) is used for lithium battery
2. Shaping difference
Polymer battery can be thinned, planarized and shaped arbitrarily, because its electrolyte can be colloidal rather than liquid in solid state, while lithium battery uses electrolyte, which requires a solid shell as secondary packaging to contain electrolyte. As a result, it also adds some weight to the lithium battery.
At present, most of the polymers are soft pack batteries, which use aluminum-plastic film as the shell. When organic electrolyte is used inside, even if the liquid is very hot, it will not explode. Because the aluminum-plastic film polymer battery uses solid or colloidal state without leakage, it is only naturally broken. But anything is not absolute. If the instantaneous current is large enough and there is a short circuit, it is not impossible for the battery to self ignite or burst. The security accidents of mobile phones and tablet computers are mostly caused by this situation.
4. Cell voltage
Because polymer battery is made of polymer material, it can be made into multilayer combination in the cell to achieve high voltage, while the nominal capacity of lithium battery cell is 3.6V. To achieve high voltage in practical application, it is necessary to connect multiple cells in series to form an ideal high voltage working platform.
If we use the above characteristics to compare polymer battery with lithium battery, the conclusion is certain. However, in the market, lithium battery is still the main application, which shows that lithium battery also has a comparative advantage. We will continue to compare.
The solid electrolyte of polymer battery is low in ionic conductivity. At present, some additives are added to make it a gel electrolyte to improve conductivity. This only increases the ionic conductivity, which is different from that of the lithium battery, and will not be affected by the quality of the auxiliary materials.
The capacity of polymer battery has not been effectively improved, and compared with the standard capacity of lithium battery, it has been reduced.
7. Manufacturing process
The thinner the polymer battery, the better the production, the thicker the lithium battery, the better the production, which makes the application of lithium battery can expand more fields.
This is the key factor to determine the market capacity of the two. At present, the price of polymer battery in the market is generally higher than that of lithium battery, which affects the market capacity of the two. The ratio of the former to the latter is 1:9.
It's hard to say which is the best between polymer battery and lithium battery. They have their own advantages. If we have to say a conclusion, polymer battery has more small applications, and lithium battery has more future in large applications. If polymer battery can break through the limitations of price and design, it may represent the development trend of battery, because its environmental protection and safety are more in line with the trend.