The performance characteristics of polymer lithium ion battery

Source: 2020 - 04 - 10 20:04 hits: polymer lithium-ion batteries, polymer lithium ion battery ( 酒吧) Also known as the polymer lithium battery, it is the second generation of rechargeable lithium ion batteries. Polymer physics ion battery materials and the positive and negative of the liquid lithium ion battery, the same working principle are basically the same. The main difference lies in the electrolyte. Lithium ion battery using liquid electrolyte and polymer lithium ion battery using solid polymer electrolyte, it can be a 'dry' or 'of the colloid, now is mainly made of polymer gel electrolyte. On this basis, polymer lithium ion battery can be divided into three categories: 1) Solid polymer electrolytes of lithium ion battery. The electrolyte is a mixture of polymer and salt. This kind of battery low ionic conductivity at room temperature, suitable for high temperature use. 2) Gel polymer electrolyte of lithium ion batteries. In the solid polymer electrolyte adding plasticizer and other additives, improve the ionic conductivity, the battery can be used at room temperature. 3) Polymer ion battery cathode materials. Conductive polymers as cathode materials, the ratio can reach three times the current lithium ion battery. 1. Polymer lithium ion battery of the structure characteristics of polymer physics ion battery electrolyte is a kind of adsorption on the polymer substrate liquid organic electrolyte, known as colloid electrolyte. The electrolyte is neither free nor solid electrolyte, so it can be made into any shape and size of batteries, such as only 1 mm thick thin batteries. A 12 v battery pack can only have 3 mm thick. Since there is no free liquid electrolyte battery, battery can work under low pressure, won't produce liquid and tender security problems such as burning explosion, so can make the cell structure is greatly simplified, do not need metal case and high pressure exhaust system, such as lu: su composite film production battery shell, can improve the special ability of the whole cell, even charging protection device can simplify the collection. Polymer lithium ion battery can also act as a kind of anode polymer material, make its quality than can be greatly improved. In addition, the polymer lithium ion battery in such aspects as working voltage, charge and discharge cycle life than lithium ion batteries have improved. Lithium polymer battery has a special structure, it consists of five overlapping thin layer. The first layer adopts metal tip as the collector. The second is negative. The third layer is a colloid electrolyte. The fourth floor with lithium foil as the cathode. The fifth layer is thermal insulation layer. Five layers of the total thickness of 0. 1mm。 The working temperature of 60 - polymer lithium battery 100℃。 The battery has a strict thermal management system to control its normal operating temperature, in order to prevent the battery overheat, when it suddenly lose a large current. Lithium polymer battery pool by eliminating liquid electrolyte, can avoid the failure battery electrolyte discharge pollution. 2. The working principle of polymer lithium ion battery polymer lithium ion battery of the positive and negative active material is the same as the liquid lithium ion battery. The negative electrode can be made of high conductivity materials, polyacetylene, polyaniline and polyphenol, etc. The anode can be UCoO2, LiMnO, LiNiO2, LiMn2 O, etc. For example, the anode is UMn2O, the cathode is artificial graphite. The battery ( Right) Discharge ( Left) The total chemical reaction equation is as follows: Lix - Ymn2o4 + yLiC6 = LixMn2O4 + yC6 as lithium ion polymer battery electrolyte, the ionic conductivity should be higher than 10 - 3 s /厘米,3。 Recently, the performance characteristics of polymer lithium ion batteries, polymer lithium ion monomer battery performance indicators is the working voltage of 3. 8 v, mass specific energy address is 150 wh/kg, volume is 246 wh / 1, the specific power is 315 w/kg, cycle life is more than 300 times, self-discharge less than 0. 1% per month, temperature - operation 25 ~ 60 ℃, charging speed lh capacity reached 80%, at most, 3 h at 100% capacity. Compared with the liquid lithium ion battery, with good safety performance, high degree of miniaturization, ultra-thin, maximum light weight, wide applicable temperature range, small self-discharge, high energy density, low cost and obvious advantages. Especially the safety performance is good, polymer lithium battery not u fluid problems, on the structure adopted aluminium flexible packaging.