Polymer batteries and lithium batteries

The concept of lithium battery is used very frequently. If you pay attention to it, you will find that there are three kinds of differences in the concept of lithium battery: broad, narrow and narrow. Generalized lithium battery includes lithium battery and lithium ion battery; Because lithium ion battery is more widely used than lithium ion battery, lithium ion battery is usually referred to in a narrow sense. Inside the lithium ion battery and there are two categories: liquid polymer lithium ion battery and lithium ion battery, because quality is bigger, more liquid lithium ion battery, so the narrow understanding of lithium-ion batteries is refers to the liquid lithium ion battery, and polymer lithium ion battery and lithium polymer battery, people used to place on the polymer battery for short. If the distinction between a lithium-polymer battery and a lithium-polymer battery is compared in a broad and narrower sense, then the only difference is the relation between species and genus. Therefore, the comparison is meaningful in a narrow sense: that is, 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 the raw material, which is the total root of the different manifestations of the two. Polymer battery refers to the use of polymer materials in at least one of the three components of the anode, cathode or electrolyte. A polymer is a molecule with a large molecular weight, and its corresponding concept is a small molecule with high strength, toughness and elasticity. At present, the polymer materials for polymer batteries are mainly used for anode and electrolyte. (1) polymer battery cathode material in addition to the use of lithium battery inorganic compounds, also can use conductive polymer; Polymer battery electrolyte has a polymer electrolyte (solid or colloidal) and organic electrolyte, lithium battery electrolyte (liquid or colloidal)

2. In shaping, polymer batteries can be made thin, of any area and of any shape because their electrolytes can be solid or colloidal rather than liquid. Lithium batteries use electrolytes and require a strong outer shell as a secondary package to hold the electrolytes. As a result, it adds a bit of weight to a lithium-ion battery.

3. Safety: most of the current polymers are soft-pack batteries, which use aluminum plastic film as the shell. When the internal organic electrolyte is used, the liquid will not explode even if it is very hot. But nothing is absolute. If the current is large enough to cause a short circuit, it is not impossible for the battery to spontaneously ignite or burst.

4. Cell voltage: because polymer batteries are made of polymer materials, they can be made into multi-layer combinations in the cell to achieve high voltage, while the nominal capacity of lithium battery cells is 3.6v. In order to achieve high voltage in practical application, multiple cells need to be connected in series to form an ideal high voltage working platform.

If polymer battery and lithium battery are compared with the above characteristics, then the conclusion is certain. However, lithium battery is still the dominant application in the market, which indicates that lithium battery also has relative advantages. We will continue to compare.

5. Conductivity: the solid electrolyte ion conductivity of polymer batteries is low. Currently, some additives are added to make it a gel electrolyte to improve the conductivity. This only increases the ionic conductivity, unlike lithium batteries, which maintains a stable value regardless of the quality of the auxiliary material.

6. Capacity: the capacity of polymer battery has not been effectively improved, and it is still reduced compared with the standard capacity of lithium battery.

7. Manufacturing process: the thinner the polymer battery, the better the production; and the thicker the lithium battery, the better the production. This allows lithium battery to expand more fields in application.

8. Price: this is the key factor determining the market capacity of the two. Currently, the price of polymer battery is generally higher than lithium battery, which affects the market capacity of the two.

Polymer battery is technically called li-polymer battery: it is also a kind of li-ion battery, but compared with li-ion battery, it is a new type of battery with obvious advantages of high energy density, miniaturization, ultrathin, lightweight and high security. In shape, the lithium polymer battery has the ultrathin characteristic, may cooperate each kind of product need, makes any shape and the capacity battery. The minimum thickness of such cells can be up to 0.5mm. Like li-ion, its nominal voltage is also a nominal voltage of 3.7v, without memory effect.

"Lithium battery" is a kind of battery with lithium metal or lithium alloy as negative electrode material and non-aqueous electrolyte solution. In 1912, lithium metal battery was first proposed and studied by gilbertn.lewis. In the 1970s, M.S.W. hittingham proposed and began to study lithium-ion batteries. Due to the very lively chemical properties of lithium metal, the processing, preservation and use of lithium metal have very high requirements for the environment. So lithium batteries have not been used for a long time. With the development of science and technology, lithium battery has become the mainstream.

The main differences are:

1, polymer battery without battery leakage problem, the battery does not contain liquid electrolyte, using colloidal solid. Lithium batteries are liquid

2. Polymer battery can be made into thin battery: with a capacity of 3.6v400mah, its thickness can be as thin as 0.5mm. Lithium batteries cannot be very thin

3. Flexible deformation of polymer battery: the maximum flexible deformation of polymer battery is about 900. Lithium batteries cannot bend or bend too much

4, polymer battery can be made into a single high voltage: liquid electrolyte battery can only be several batteries in series to get high voltage, polymer battery.

5. The polymer battery has no liquid itself, so it can be made into a multi-layer combination within a single cell to achieve high voltage.

Polymer batteries will hold twice as much energy as comparable lithium-ion batteries.

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