Which is better, lithium polymer or lithium battery?

Feb 10, 2019   Pageview:156

Lithium polymer battery is lithium ion batteries upgrading products. Relative to the lithium ion battery in fashion now, it has a large capacity, small in size (thin), security (not bang), etc. However, because of the whole industry chain and upgrading, its cost (cost) is still relatively high, only used in high-end digital products (ultra thin laptop computers, etc.).

Predictably, in the next 5-10 years, lithium polymer battery will replace the existing lithium-ion batteries!In fact, in the electronics industry more developed countries such as Japan and South Korea the popularity rate of lithium polymer battery has reached a certain level, only in this respect is relatively backward in our country, let us wait and see!, etc in the near future with lithium polymer battery cell phone cheaper, I have to change a new cell phone this safer (battery)!

Lithium polymer battery (Li - polymer, also known as the polymer lithium battery) : with high energy density, miniaturization, ultra-thin, lightweight, and high safety and low cost, and other obvious advantages, is a new type of battery. In shape, lithium polymer battery with ultra-thin characteristics, can match the needs of the various products, made into any shape and the capacity of the battery. The battery can achieve the minimum thickness of 0.5 mm. The relative to the lithium ion battery, lithium polymer battery characteristics are as follows:

1. No battery leakage problems, its inside the battery does not contain liquid electrolyte, the use of colloidal solids.

2. Can be made into thin battery: 3.6 V400mAh capacity, its thickness can be thin to 0.5 mm.

3. The battery can be designed into various shapes.

4. The battery can be bending deformation: polymer battery maximum bending around 90 °.

5. Can be made into a single high voltage: liquid electrolyte battery only with the number of cells in series with high voltage, and the polymer batteries as there is no liquid itself, can be made within the single star multilayer combination to achieve high voltage.

6. Capacity will is more than double that of the same size of lithium ion batteries.

Lithium polymer battery (Li - polymer, also known as the polymer lithium battery) : relative battery, before speaking, high power, miniaturization, lightweight, is a kind of chemical properties of the battery.

Lithium polymer battery in shape, lithium polymer battery with ultra-thin characteristics, can match the need of some products, made into different shapes and capacity of the battery.This kind of battery, in theory, the minimum thickness of 0.5 mm.

General battery of three elements: the anode, cathode and electrolyte.The so-called lithium polymer compound battery refers to the three elements of at least one or more than one use polymer battery system.In the lithium polymer battery system, polymer materials Most are used in the anode and electrolyte.Positive electrode material is using a conductive high molecular polymer or generally used in lithium ion battery inorganic compounds, commonly used lithium metal or lithium anode carbon layer between compound, is to use solid state electrolyte or colloidal polymer electrolyte, or organic electrolyte.Because there is no redundant electrolyte in lithium polymer, thus it more reliable and more stable.

Lithium polymer battery is to use file alloy anode, conductive polymer materials, polyacetylene, polyaniline/poly phenol anode, organic solvent as electrolyte.Lithium polyaniline battery than energy can reach 350 w. h/kg, but only 50 to 60 w/kg, using temperature - 40-70 degrees, life is about 330 times or so.

Relative to the lithium ion battery, lithium polymer battery characteristics are as follows:

1. Relatively, improve the battery leakage problem, but did not improve thoroughly.

2. Can be made into thin battery: 3.6 V250mAh capacity, its thickness can be thin to 0.5 mm.

3. The battery can be designed into various shapes.

4. Can be made into a single high voltage: liquid electrolyte battery can only with the number of cells in series with high voltage, and the polymer batteries as there is no liquid itself, can be made within the single star multilayer combination to achieve high voltage.

5. Put the battery, lithium ion batteries are the same size 10% higher than that of theory.

Lithium polymer battery (Li - polymer, also called a polymer lithium ion battery), with high specific energy, miniaturization, ultra-thin, lightweight and safety higher multiple optimal potential.Based on the advantages of lithium polymer battery is can be made into any shape and the capacity of the battery, to meet the needs of the various products;And it USES aluminum-plastic packaging, interior problems can be immediately through the outer packing, even pose a safety hazard, also won't explode, ballooning.In polymer battery, the electrolyte plays a diaphragm and electrolyte double function: on the one hand, like the diaphragm isolated from anode materials, to make the interior of the battery is not happen since the discharge and short circuit, on the other hand, as the electrolyte in the cathode conduction between lithium ion.Polymer electrolyte is not only has good electrical conductivity, but also have high material of light quality, good elasticity, easy film, light also complied with the learning quality of power supply, the development trend of safety, high efficiency, environmental protection.

All of the lithium ion battery, whether before, or over the years, including:Polymer lithium ion batteries,Lithium iron phosphate batteries and so on, are very afraid of the battery internal short circuit and external short circuit batteries, the overcharge.

Because, chemical properties of lithium is very active, it is easy to burn, when the battery discharge, charge, inside the battery will continue to heat up, activation of gas in the process of inflation, the battery internal pressure increase, pressure reaches a certain extent, such as shell have scars, which will burst, causing leakage, fire, or even explode.

Technical personnel in order to alleviate the risk of lithium ion battery, joined the inhibit lithium active ingredients (such as cobalt, manganese, iron, etc.), but can not fundamentally change the dangers of lithium ion batteries.

Ordinary lithium ion battery when overcharge, short circuit, and so on and so forth occurs, the battery internal temperature, the anode materials decomposition may occur, the phenomenon such as the cathode and electrolyte materials is oxidation, resulting in gas expansion and the battery internal pressure increase, when the stress reaches a certain degree after explosion may appear.Polymer lithium ion battery for use the colloidal electrolyte, not because the liquid boiling and produce a large amount of gas, thus eliminating the possibility of explosions.

At present domestic most polymer battery is just soft package battery, aluminum-plastic film is applied to make shell, but the electrolyte has not changed.The battery can also be thin, the low temperature discharge characteristic is better than polymer battery, and the material energy density with common polymer liquid lithium battery, battery, but because use the aluminum composite membrane, therefore is more light than ordinary liquid lithium electricity.Security, when just boiling liquid soft package of battery aluminum-plastic film naturally bulge or rupture, also won't explode.

Must pay attention to is that the batteries still can burn or expansion cracks, security is not foolproof.

So everyone in the use of all kinds of lithium ion battery, must pay attention to safety.

Lithium ion battery has liquid lithium ion battery (LIB) and lithium polymer battery (PLIB) two kinds.Among them, the liquid lithium ion battery is refers to the Li + embedded compounds for positive and negative secondary battery.The anode with lithium compound LiCoO2, LiNiO2 or LiMn2O4, carbon anode with lithium - LixC6 inter layer compounds, the typical battery system for:

(-) C | LiPF6—EC+DEC | LiCoO2 (+)

The positive reaction: LiCoO2 = Li1 - xCoO2 + xLi++ xe -

The cathode reaction: 6 c + xLi++ xe - = LixC6

Battery overall reaction: LiCoO2 + 6 c = Li1 - xCoO2 + LixC6

Principle is the same as liquid lithium lithium polymer battery, the electrolyte is the main difference between different from liquid lithium.The main structure consists of the positive and negative battery electrolyte three elements.So-called lithium polymer battery is said in the three main structure at least one or more than one use of polymer materials as the main battery system.And in the development of lithium polymer battery systems, high polymer material is mainly used in the anode and electrolyte.Anode materials include conductive polymer or lithium ion batteries used in inorganic compounds commonly, use solid electrolyte or colloidal polymer electrolytes, or organic electrolyte, lithium ion technology commonly used liquid or gel electrolyte, so need to accommodate combustible solid secondary packaging, the active ingredient, this increases the weight, in addition also limits the size of flexibility.

A new generation of lithium polymer batteries in shape, can be done in theory, shape diversification, improve the flexibility of the battery modelling design, in order to meet the needs of the product, make some shapes and the capacity of the battery, for the application equipment developers on the power supply solution provides a high degree of design flexibility and adaptability, in order to maximize the optimization of its product performance.At the same time, lithium polymer battery than the average energy per unit of lithium ion battery increased by 10%.In such aspects as its capacity, circle life is lithium ion batteries have greatly improved.

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