Adopted by the analysis of polymer lithium ion battery technology

Energy and environment are two serious problems that mankind must face in the 21st century. The development of new energy and clean renewable energy is one of the most decisive technological fields in the world economy in the future. Lithium ion battery has developed rapidly since it came into being, because it just meets the requirements of miniaturization, lightweight, long working time, long life, no memory effect and no environmental pollution of power supply for the rapid development of mobile communication and laptop. Polymer solid electrolyte instead of liquid electrolyte to manufacture polymer lithium ion battery, is a major progress in lithium ion battery, its main advantages are high reliability and processing, can be made into a fully plastic structure, so as to make ultra-thin and freedom of the battery to achieve the desire.

Polymer lithium ion battery technology

1. The structure characteristics of lithium ion batteries

Across the electrodes of lithium ion battery active substances are embedded into the compound, charging Li + from the anode out, through the electrolyte is inserted into the negative; Discharge, by contrast, when the battery charge and discharge process is, in fact, Li + embedded in the back and forth between the two electrodes and the process of emergence, therefore, the battery is also known as "rocking-chair batteries" (RockingChairBatteries, abbreviated RCB).The reaction diagram and basic reactive as shown below:

2. The polymer lithium-ion battery technology

2.1 The performance characteristics of polymer lithium ion battery

Polymer lithium ion battery is refers to the electrolyte using solid polymer electrolyte (SPE) of lithium ion batteries. Battery set fluid from the positive and the positive film, polymer electrolyte film, negative film, anode sets fluid compression composite molding, outsourcing aluminum-plastic composite membrane, and the edge of the hot melt sealing, polymer lithium ion battery. As the electrolyte membrane is solid, there is no leakage problem, on the battery design degrees of freedom is larger, can according to the need for series-parallel or adopt a bipolar structure.

Polymer lithium ion battery has the following characteristics: (1) shaping flexibility;(2) the quality of the higher than energy (3 times the MH - Ni battery);(3) wide electrochemical stability window, up to 5 v.(4) the safety and reliability of the perfect;(5) a longer cycle life, less capacity loss; (6)High volume utilization; All landowners a wide range of applications.

Its performance indicators are as follows: working voltage: 3.8 V. Specific energy: 130 wh/kg, 130 wh/L; Cycle life: > 300; Self-discharge: < 0.1% / month; Working temperature: 253-328 k; Charging speed: 1 h at 80% capacity; 3 h at 100% capacity; Environmental factors: non-toxic.

2.2 the anode material

The characteristics of lithium ion battery and price are closely associated with its positive electrode materials, in general, the anode materials should satisfy: (1) within the scope of the charge and discharge potential of required, electrochemical compatibility with electrolyte solution; (2)mild electrode process kinetics;(3) highly reversible;(4) the lithium condition stable performance is good in the air. With the development of lithium ion battery, high performance and low cost of the anode materials research work in constantly. At present, the research mainly focused on the lithium cobalt oxide, lithium nickel oxide, lithium and lithium manganese oxide of transition metal oxides.

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