Polymer Lithium Ion Battery

- Mar 04, 2017-


Polymer lithium Ion Battery (Polymer lithium Ion ', PUB), also known as the Polymer lithium Battery. It belongs to the second generation of rechargeable lithium Ion batteries.Physical ion battery anode materials are used in the polymerization and the liquid lithium ion battery is the same, its working principle is basically the same.Their main difference is that the different electrolyte, lithium ion battery using the liquid electrolyte, polymer lithium ion battery is in solid polymer electrolyte as a substitute for, the polymer can be "dry", also can be "colloidal", at present most of the polymer gel electrolyte.On this basis, polymer lithium ion battery can be divided into three categories:
1) solid polymer electrolyte of lithium ion battery.For polymer electrolyte with a mixture of salt, the battery the ionic conductivity at room temperature is low, suitable for high temperature use.
2) gel polymer electrolyte of lithium ion batteries.Namely, add people to the solid polymer electrolyte additive such as plasticizer, from the ionic conductivity, the battery can be used at room temperature.
3) the anode material of ion polymer battery.Than by using the conductive polymers as the anode material, most can be three times as many now has a lithium-ion battery. It is a promising lithium ion batteries.

1. The structural characteristics of polymer lithium ion batteries
Aggregation of physical ion battery electrolytes is the organic liquid electrolyte adsorption on a polymer matrix, called gel electrolytes.This electrolyte is neither free electrolyte, nor is it a solid electrolyte, because this can make the vigilant shape and size of the battery, such as can be made for LMM thin thickness electrical him. A 12 v battery pack can only 3 mm thick.Due to there is no free electrolyte in the battery, battery can work under low pressure, won't produce liquid and tender explosion safety problems such as burning, so can make the cell structure is greatly simplified, do not need metal case and high pressure exhaust system, such as lu: su composite membrane manufacturing electric pool enclosure, which can improve the specific capacity of the whole cell, and can simplify even gather charging protection device.Polymer lithium ion electricity pool also can be used in a polymer as the anode material, make its quality than energy greatly improved.In addition, the polymer lithium ion battery in such aspects as working voltage, charge and discharge cycle life than lithium ion battery were also improved. 
Lithium polymer monomer battery structure is special, it is composed of five thin layer overlay: the first layer with a metal tip as a collector.The 2nd is negative.The third layer is a colloid electrolyte.The fourth floor with lithium foil as the cathode.The fifth floor is for insulation.Five layer stack up to a total thickness of 0.1 mm.The working temperature of the lithium polymer battery for 60-100 ℃.In order to prevent the battery has a large instantaneous output current overheat, heat the battery has a strict management system to control its normal operating temperature.Li-ion polymer battery pool due to eliminate the liquid electrolyte, which can avoid the failure of battery electrolyte overflow caused by pollution.
2. The working principle of polymer lithium ion battery
Polymer lithium ion battery of his positive and negative active material and liquid lithium ion battery brand affinity and the negative electrode can be used highly conductive material, polyacetylene, polyaniline/poly phenol, etc., the positive for UCoO2 LiMnO,, LiNiO2 and LiMn2 O, etc.Use UMn2O, for example: the positive and negative extremely artificial graphite. Electrolyte for LiP every/organic carbonate mixture of vinegar, and put the electric solution quality, and the adsorption in a polymer matrix.The battery () to the left (right), discharge of total type chemical reaction equation is:
Lix yMn2O4 + yLiC6 = LixMn2O4 + yC6 electrolytes used in lithium ion polymer battery, should ionic conductivity is higher than 10-3 S/cm,
3. The performance characteristics of polymer lithium ion battery
Recently, polymer lithium ion monomer battery performance indicators for the working voltage of 3. 8 v, mass ratio can be addressed as w. h. 150 / kg, volume ratio of energy 246 w. h / 1., than the power of 315 w/kg, cycle life is more than 300 times, uniformity in 0.1% / month, working temperature and 25 ~ 60 ℃, charging speed lh 80% most, 3 h reached 100% capacity address.It compared with liquid lithium ion battery, has good safety performance, the higher degree of miniaturization, ultra-thin, light the most, and wider applicable temperature range, low self-discharge, high energy density and low cost of many obvious advantages, is a kind of ideal power battery.In particular the safety performance is good, polymer lithium battery not u fluid problems, on the structure adopted aluminum flexible packaging.Liquid lithium ion battery using metal case, easy to explode.Polymer lithium batteries will only at most gas drum.And the protection circuit design can be simplified accordingly, which can save the cost.Its shape can according to need to customize, thickness can be done very thin, the application field is quite extensive.Due to the flexible solid polymer, polymer lithium ion battery is lithium metal tip seal in the battery, make can still work normally under high temperature.The safety of the battery also has been proved the crash test.
Is important to note that when multiple polymerization physical batteries in series, to prevent over charge and discharge.In addition, the aggregation of physical ion battery quick charging performance remains to be further improved.

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