1. The fundamental difference is the raw material.
It is the general root of the different manifestations of the two. Polymer batteries refer to the use of polymer materials in at least one of the three main components of the positive electrode, negative electrode or 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 batterieslithium use electrolytes (liquid or colloidal). colloid)
2. Formatting Differences
Polymer batteries can be thin, in any area and in any shape, because the electrolyte can be solid and stickable. 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 sufficiently large and a short-circuit occurs, it is not impossible for the battery to ignite or burst spontaneously. This is the reason why most security accidents happen on cell phones and 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 palso have comparative advantages. . , let's continue the comparison.
5. Conductivity
The solid electrolyte of polymer batteries has low ionic conductivity. At present, some additives are mainly added to make it 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 improved effectively and has been reduced compared to standard capacity lithium batteries.
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 camarket peace of both. At present, the price of polymer batteries on the market is generally higher than that of lithium batteries. , which affects the market capacity of the two, the ratio of the former to the latter 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 batteries liquid lithium-ion (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 iron phosphate materials.lithium. and the negative electrode materials are graphite, and the working principles of the battery are basically the same.
The main difference is 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.
The difference between lithium polymer batteries and lithium cobalt oxide batteries
Polymer batteries are a type of lithium battery that are generally divided into steel hulls and aluminum hulls. These types of lithium polymer batteries
In the battery industry, lithium polymer batteries are generally called soft-pack lithium batteries
Real lithium polymer batteries are usedsmells like a solid or gel electrolyte, which guarantees safety performance. is very good, but the so-called polymer batteries currently on the market are only soft lithium-ion batteries.
Depending on the characteristics of lithium batteries, it is not necessary to fully charge the battery before use. If you need it in an emergency, just use it directly
But it is recommended. to fully charge it as much as possible. After all, lithium batteries are easy to use. As the number of uses increases, the battery capacity continues to decrease, which can reduce the number of charges and increase the lifespan. >
1. Different characteristics
1. Lithium polymer battery: shaping flexibility; higher mass specific energy (3 times that of MH-Ni batteries, wide electrochemical stability window, up to 5V); ; safety and reliability parfaites; longer life, less capacity loss;
2. Lithium cobalt oxide battery: stable structure, high capacity ratio, outstanding overall performance, but its safety is poor and the cost is very high.
2. Different applications
1. Lithium Polymer Battery: It has been more than 2 years since lithium-ion polymer battery technology matured and was commercialized globally, although sales are increasing rapidly. , However, its market share is still about 10%, which is incomparable with the 90% market share of liquid lithium batteries and is lower than people's expectations.
2. Lithium cobalt oxide battery: The application of lithium cobalt oxide battery is still relatively few. The technology of using cobalt-lithium for small batteries is very mature, but the cost of cobalt-lithium is now too high. Many eCompanies instead use manganese-lithium.
Lithium cobalt oxide has stable performance and is currently the most mature technology used in mobile phones and other applications. The big disadvantage is its high cost, and cobalt is a relatively rare strategic metal, and it is also difficult to use it to power batteries.
Detailed information:
Precautions for using lithium polymer batteries:
1. Pay attention to short circuit conditions
Lithium-ion polymer batteries are subject to short circuit conditions during the charging process. Including: internal short circuit, external short circuit, etc. Although most lithium-ion batteries now have short circuit protection and explosion-proof wires, in many cases this protection circuit may not work.operate under various circumstances, and the role of explosion-proof wires is also very limited.
2. Do not overcharge when charging
If the lithium-ion polymer battery is charged for too long, the possibility of expansion will increase.
Baidu Encyclopedia-Lithium Ion Polymer Battery
Baidu Encyclopedia-Lithium Cobalt Oxide Battery