Analysis of the working principle, structure and application of charging lithium battery

Analysis of the working principle, structure and application of charging lithium battery

Working principle, structure and application analysis of lithium-ion battery manufacturer. Lithium ion battery is a rechargeable battery, which is important to move between lithium ions between the positive and negative poles..

Lithium-ion batteries have the advantages of high energy density, small area, and long cycle life, and have been widely used in life.. The use of lithium-ion batteries in modern life is increasingly important.

This paper introduces the working principle, structure and application of lithium-ion batteries.. 01 Lithium ion battery works for a lithium ion battery is a rechargeable battery, which is important to move between lithium ions between the positive and negative poles.

. During the charge and discharge process, the Li + insert layer is escaled between the two electrodes: in the rechargeable battery, Li + is absent from the positive electrode, inserted into the negative electrode, and the negative electrode is in a lithium state; on the contrary. Materials with lithium electrodes are representatives of modern high performance batteries.

The working principle of lithium-ion battery is charge and discharge principle. When the lithium ion battery is discharged, the electrons and Li + simultaneously, the direction is the same, but the path is different, and the electron is negatively positive by the external circuit; lithium ion Li + from the negative “jumping into” electrolyte, “swim” reaches the positive electrode and operates For a long time together. During the charge and discharge of the lithium ion battery, the lithium ion is in a moving state from the positive electrode to the negative electrode.

. If we compare the lithium-ion battery, the rocking chair is the two poles of the battery, and the lithium ions are like a good athlete run back in both ends of the rocking chair..

So the experts gave the battery a lovely name, rocking chair battery. 02 Structure of lithium ion battery The structure of the lithium ion battery consists of five parts: positive, negative electrode, electrolyte, diaphragm, housing and electrode leads. The structure of the lithium ion battery can be divided into two categories of winding type and stacking.

. The liquid lithium ion battery has a winding structure, and the polymer lithium ion battery has a winding structure..

Cathode material: active material, conductive agent, solvent, binder, matrix. In a lithium-ion battery, the positive material market has the largest capacity, higher added value, accounting for 30% of the lithium-ion battery cost, and the gross profit margin is low in 15%, high levels of 70% or more..

At present, the material has been used in a lithium ion battery, which is important to include lithium cobalt oxides, lithium manganese oxides, lithium nickel nickel manganese oxides, lithium cobalt manganese oxides and lithium iron phosphate.. Negative electrode material: active substance (graphite, mcMB, CMS), adhesive, solvent, and matrix.

Negative electrode materials are lower in lithium electricity cost, important include carbon negative electrode materials and non-carbon negative electrode materials. The diaphragm: the diaphragm as the isolation electrode is placed between the two poles to prevent direct contact between the two-pole active substances from being short-circuited to a lithium ion battery..

The diaphragm still needs to make the isolated path to form a path.. Important lithium-ion battery diaphragm material includes single layer PP, PE, PP + ceramic coating, PE + ceramic coating, dual pp / pp and three-layer PP / PE / PP.

Electrolyte: Housing Hardware (steel shell, aluminum shell, cover, ear, insulating sheet, insulating tape) is LiPF6, but the price is expensive; other LIASF6, but the toxicity; LICLQ, has strong oxidation; Organic solvents include DEC, DMC, DME, etc.. Battery housing: Divided into steel housing (squares are rarely used), aluminum housing, nickel plated iron shell (used for cylindrical batteries), aluminum molding, etc.

, and battery cover, also the positive and negative leads of the battery. 03 Lithium-ion battery Application ranges from the development of my country’s lithium-ion battery application market, more and more nickel-cadmium batteries and nickel-hydrogen batteries will be replaced by lithium-ion batteries; in the field of IT, laptop has developed rapidly, mobile year average The replacement rate is not less than 15%; the steady rise of digital product sales will drive the rise of lithium-ion battery shipments..

In addition to these portable lithium-ion battery applications, electric tools, spare power supplies and vehicle power supplies show broad prospects for lithium-ion battery applications.. Lithium-ion batteries have also begun to enter the field.

At present, lithium-ion batteries are widely used in mobile phones, laptops, electric tools, electric vehicles, street lamps, spare power, lamps, household appliances, etc., can be said to be the largest application group. This battery is important for consumer goods, digital products, power products, medical and safety.

Lithium-ion batteries are widely used in commercial applications due to their good performance, high environmental adaptability and green environmental protection, and the good performance of the battery is reflected in its high storage density, approximately 6 times the lead-acid battery, and The weight is only 1/6 of the lead-acid battery, and the battery’s cycle life can reach more than 6 years.. High environmental adaptability of lithium-ion batteries reflects its high power load capacity, strong low temperature and lower self-discharge probability, greatly expanded the application range and application of the battery; its green environmental protection is reflected in lithium-ion batteries In production and use, no harmful metal elements and substances, such as lead, mercury, cadmium.


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