Cylinders for lithium-ion battery electrolytes. The lithium battery electrolyte is the transport medium for ions in the battery. Composed of lithium salt and organic solvent. The electrolyte plays a role in the conduction of ions between the positive and negative electrodes of lithium batteries, which ensures that lithium ion batteries obtain the advantages of high voltage and high specific energy. The electrolyte is generally prepared from high purity organic solvents, lithium salts of electrolyte, necessary additives and other raw materials under certain conditions and in certain proportions. It is best to use a steel bottle, which can also be protected from light.
1. The fundamental difference lies in the raw material.
This is the root cause of the different manifestations of the two. Polymer batteries refer to the use of polym materialsers in at least one of the three main components of the positive electrode, the negative electrode or the electrolyte. Polymer means large molecular weight and its corresponding concept is small molecules. Polymers have high strength, high toughness and high elasticity. Polymer materials currently developed for polymer batteries are mainly used for cathodes and electrolytes. ① In addition to inorganic compounds of lithium batteries, the positive electrode material of polymer batteries can also use conductive polymers; ② The electrolytes of polymer batteries include polymer electrolytes (solid or colloidal) and organic electrolytes, and lithium batteries use electrolytes (liquid or colloidal). colloid)
2. Formatting differences
Polymer batteries can be thin, in any area and under anywhat shape, because the electrolyte can be solid and sticky. Lithium batteries use electrolyte and require a solid shell as secondary packaging to contain the electrolyte. Therefore, it also adds weight to the lithium battery.
3. In terms of safety
Most current polymer batteries are soft batteries, which use aluminum-plastic film as the outer casing when organic electrolytes are used inside. They will not explode even if the liquid is very hot, because the aluminum-plastic film polymer battery adopts solid or colloidal state without leaking and only breaks naturally. But nothing is absolute. If the instantaneous current is large enough and a short circuit occurs, it is not impossible for the battery to ignite or spontaneously burst. This is the reason why most security accidents happen on cell phones andthe tablets.
4. Cell Voltage
Since polymer batteries use polymer materials, multi-layer combinations can be made in cells to achieve high voltages, while the rated cell capacity of lithium batteries is 3, 6V. If you want to achieve high voltage in real applications, you need to connect multiple cells in series to form an ideal high voltage working platform.
If you use the above characteristics to compare polymer batteries and lithium batteries, which is better, then the conclusion is certain. However, lithium batteries still dominate the market, which shows that lithium batteries also have comparative advantages. . , let's continue the comparison.
5. Conductivity
The solid electrolyte of polymer batteries has low ionic conductivity. Currently, some additives are mainly added to make it a gel electrolyte to improve the conductivity. This only increases the ionic conductivity, unlike the conductivity of lithium batteries which maintains a stable value and is not affected by the quality of auxiliary materials.
6. Capacity
The capacity of polymer batteries has not been effectively improved compared with standard capacity lithium batteries. The battery has also been reduced.
7. Manufacturing process
The thinner the polymer battery, the better it can be produced, and the thicker the lithium battery, the better it can be produced. expand into more application areas.
8. Price
This is the key factor that determines the market capacity of both. At present, the price of polymer batteries on the market is generally higher than that of lithium batteries. , which affects the capacity of the march of the two, the ratio of the first to the second is 1:9.
Detailed information
Lithium ion polymer battery
According to the different electrolyte materials used in lithium ion batteries, lithium ion batteries are divided into lithium liquid -ion batteries (LiquefiedLithium-IonBattery, called LIB) and polymer lithium-ion batteries (PolymerLithium-IonBattery, called PLB) or plastic lithium-ion batteries (PlasticLithiumIonBatteries, called PLB).
The positive and negative electrode materials used in lithium-ion polymer batteries are the same as liquid lithium ions. Positive electrode materials are divided into lithium cobalt oxide, lithium manganate, ternary materials and lithium iron phosphate materials. and the negative electrode materials are graphite, and the working principles of the battery are basically the same.
The main differenceference lies in the electrolyte. Liquid lithium-ion batteries use liquid electrolytes, while lithium-ion polymer batteries use solid polymer electrolytes instead. This polymer can also be in the dry state. be "colloidal", and currently most use polymer gel electrolytes.