What is the difference between liquid lithium battery and lithium polymer battery?

Lithium polymer battery is an upgraded product of lithium ion battery. Compared with the current popular lithium ion battery, it has the advantages of large capacity, small size (thin), safety (no explosion), etc. However, due to the entire industrial chain it takes a certain amount of time to replace it. Its cost (cost) is still relatively high, and it is only used in high-end digital products (ultra-thin notebook computers, etc.).

It is foreseeable that in the next 5-10 years, lithium polymer batteries will replace the existing lithium-ion batteries! In fact, the popularity of lithium polymer batteries in countries such as Japan and South Korea, which are more developed in the electronics industry, has reached A certain level, but China is still relatively backward in this respect, let us wait and see! Waiting for the future, the use of lithium polymer battery mobile phones costs less, I must replace this more secure mobile phone (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 a thin battery: with a capacity of 3.6V400mAh, its thickness can be as thin as 0.5mm.

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-ion batteries are classified into liquid lithium-ion batteries (Liquified Lithium-Ion Battery, LIB for short) and polymer lithium-ion batteries (Polymer Lithium-Ion Battery, PLB for short) or plastic lithium-ion batteries (Plastic lithium ion batteries). , referred to as PLB). The positive and negative materials used in the polymer lithium ion battery are the same as the liquid lithium ions. The positive electrode material is divided into lithium cobaltate, lithium manganate, ternary material and lithium iron phosphate material, and the negative electrode is graphite. The working principle of the battery is also basically Consistent. The main difference is that the electrolyte is different. The liquid lithium ion battery uses a liquid electrolyte, and the polymer lithium ion battery is replaced by a solid polymer electrolyte. The polymer can be either "dry" or "colloidal". Most of the current polymer gel electrolytes are used.

Solid

Solid polymer electrolyte of lithium ion battery electrolyte for the polymer with a mixture of salt, the battery the ionic conductivity at room temperature is high, can be used at room temperature.

Gel

Gel polymer electrolyte for lithium ion batteries is in solid polymer electrolyte adding plasticizer and other additives, thus improve the ionic conductivity, the battery can be used at room temperature.

Polymer

Since the solid electrolyte is used instead of the liquid electrolyte, the polymer lithium ion battery has the advantages of being thinner, arbitrarily aread, and arbitrarily shaped compared with the liquid lithium ion battery, so that the battery casing can be fabricated from the aluminum-plastic composite film, thereby It can improve the specific capacity of the whole battery; the polymer lithium ion battery can also use the polymer as the positive electrode material, and its mass specific energy will be more than 20% higher than the current liquid lithium ion battery. The polymer lithium ion (Polymer Lithium-Ion Battery) battery is characterized by being compact, thin, and lightweight. Therefore, the market share of polymer batteries will gradually increase.

Polymer lithium ion battery has the following features of [1]:

(1) Shaping flexibility;

(2)The quality of the higher than energy (3 times the MH - Ni battery);

(3) Electrochemical stability window width, up to 5V;

(4) The safety and reliability of the perfect;

(5)A longer cycle life, less capacity loss;

6. High volume utilization;

Lithium ion battery has liquid lithium ion battery (LIB) and polymer lithium ion battery (PLB).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 interlayer compounds, the typical battery system for:

(-)C|LiPF6—EC+DEC|LiCoO2(+)

The positive reaction, reduction reaction: Li1 - xCoO2 + xLi++ xe - = LiCoO2 -- -- -- -- -- -- -- -- -- -- - (2.1)

The cathode reaction (oxidation) : LixC6 xe - = xLi 6 c + + -- -- -- -- -- -- -- -- -- -- -- (2.2)

Battery overall reaction: Li1 - xCoO2 + LixC6 = LiCoO2 + 6 c -- -- -- -- -- -- -- -- -- -- - (2.3)

Principle and liquid lithium polymer lithium ion battery is the same. The main difference is that the electrolyte is different from liquid lithium. The main structure consists of the positive and negative battery electrolyte three elements. So-called polymer lithium ion battery is said in the three main structure at least one or more than one use of polymer materials as the main battery system. But in the current development of polymer lithium ion battery systems, polymer materials are 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 polymer lithium ion battery in shape can be thin shape is changed (ATL battery can reach 0.5 mm, the thinnest phase in the thickness of the card) and arbitrary shape, arbitrary area, greatly improving the battery design flexibility, which can meet the needs of the product, made into any shape and the capacity of the battery, for the equipment on the power supply solution developers provide some design flexibility and adaptability, in order to maximize the optimization of its product performance. At the same time, polymer lithium ion battery energy per unit of a 20% increase over the current general lithium ion battery, its capacity, and environmental performance is lithium ion battery, there are some improvements.

1 attaches great importance to the short circuit

Polymer lithium ion battery, it is easy to occur in the process of charging circuit. Include: internal short circuit and external short circuit, and so on and so forth.

Although, now most of the lithium ion battery with short circuit protection circuit, and explosion-proof line, but in many cases, the protection circuit may not play a role in any cases, explosion-proof line to the role of is also very limited.

2 charge don't overcharge

Polymer lithium ion battery, if the charging time is too long, will increase the possibility of inflation.

The chemical properties of lithium are very active and easy to burn. When the battery is charged and discharged, the inside of the battery continues to heat up. The gas generated during the activation process expands, the internal pressure of the battery increases, and the pressure reaches a certain level. If the outer casing is scratched, it will rupture and cause leakage, fire, or even explosion. Polymer lithium-ion battery will only expand.

When you are using it, be sure to pay attention to safety.

Chemical properties of lithium are very lively, easy to burn, when the battery charge and discharge, inside the battery is on the rise. Produced by gas expansion in the process of activation, the battery internal pressure increase, pressure reaches a certain extent, such as shell have scars, which will burst and cause leakage, fire, or even an explosion. The polymer lithium ion battery will only expand.

Everyone must be careful when using it.

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