With the continuous improvement of high technology, but also because of the continuous demand for energy saving and environmental protection, more and more energy-saving and environmental protection products have been applied to the market. In terms of the battery market, lithium batteries are rapidly replacing conventional lead-acid batteries with various advantages. Become the main force in the energy storage market. There are many types of lithium batteries, ternary materials, lithium iron phosphate materials, lithium ions, iron manganese oxide, lithium polymer batteries and other types. So what is better for lithium-ion batteries and polymer lithium batteries?
1, the fundamental difference is raw materials
This is the general source of the various manifestations of the two. The polymer battery means that at least one of the three major components of the positive electrode, the negative electrode, or the electrolyte uses a polymer material. Polymers mean large molecular weights, and the concept corresponding to them is small molecules. Polymers have high strength, high toughness, and high elasticity. Currently developed polymer battery polymer materials are mainly used for positive electrodes and electrolytes. 1) In addition to the inorganic compounds of lithium batteries, the cathode materials of polymer batteries can also be made of conductive high-molecular polymers; 2) The electrolytes of polymer batteries include polymer electrolytes (solid or colloidal) and organic electrolytes, and lithium batteries use electrolytes(liquid or gel).
2, shape difference
The polymer battery can be thinned, arbitrarily formed, and arbitrarily shaped because the electrolyte can be in the solid state but not in the liquid state. The lithium battery adopts the electrolyte and requires a strong case as the secondary package to contain the electrolyte. Therefore, this also increases the weight of the lithium battery.
Most of the current polymers are soft-packed batteries that use aluminum-plastic membranes as the outer shell. When organic electrolytes are used inside, they do not explode even if the liquid is very hot, because the aluminum-plastic membrane polymer batteries use solid or colloidal fluids without leakage. Natural rupture. But anything is not absolute. If the instantaneous current is large enough and a short circuit occurs, it is not impossible for the battery to self-ignite or burst. The occurrence of security accidents in mobile phones and tablet computers is caused by this situation.
4, battery voltage
Since the polymer battery uses a polymer material, a multi-layer combination can be made in the battery to achieve a high voltage, and the nominal capacity of the lithium battery core is 3.6V. In order to achieve a high voltage in practical use, multiple voltages are required. The cells are connected in series to form an ideal high voltage working platform.
If you use the above features to compare polymer batteries and lithium batteries, which is good, then the conclusion is certain, however, the application of lithium batteries in the market is still dominant, indicating that lithium batteries also have a comparative advantage, and we continue to compare them.
The solid-state electrolyte of the polymer battery has low ionic conductivity, and at present, mainly additives are added to make it a gel electrolyte to improve the conductivity. This also only increases the ionic conductance, unlike the conductivity of the lithium battery, which maintains a stable value without being affected by the quality of the auxiliary material.
The capacity of the polymer battery has not been effectively improved, and it has been reduced compared with the standard capacity lithium battery.
7, manufacturing process
The thinner the polymer battery, the better the production. The thicker the lithium battery, the better the production. This makes the lithium battery more applicable in the field of expansion.
This is the key factor that determines the market capacity of both. At present, the price of polymer batteries in 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.
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