Jun 12, 2019 Pageview：147
There are three types of Lithium-Ion Batteries based on different cathode materials cobalt oxide, manganese oxide, and iron phosphate.
The cobalt/lithium oxide battery has the advantage of its high energy density, but it has serious safety problems. The lithium/manganese oxide is the most used due to its characteristics and safety, but its poor performance at high temperatures is a significant disadvantage while lithium/iron phosphate has the best features of safety, long cycle life (more than 2000 cycles) and good availability.
Lithium-based rechargeable batteries are available in two similar chemical compositions: cylindrical/tubular lithium ion (Li-Ion) and lithium polymer (Li-Po) flat. ?
Lithium battery, also called Li-Ion battery, works as follows, is a rechargeable battery with two or more cells where the lithium ions are separated. When operating in discharge mode, the ions of one cell and another are chemically combined to form the stable element, and this combination occurs in an exo-thermal way. That is, it produces energy that is used when the battery is exhausted, it is because all the ions are in their fundamental state, and there is no more to follow combining.
Batteries use electrochemical reactions to produce an electric current. Essentially, the chemical energy of the material stored in the battery is converted into electrical energy through a chemical reaction. A chemical reaction occurs when there is an excess of electrons at the anode. These simply cannot escape to the cathode because the electrolyte separates the two.
When the battery is connected to a circuit, the electrodes are run through the circuit from the anode to the cathode, and the energy can be drawn from them along the path.
How Many Cells In Lithium-Ion Battery:
In lithium-ion batteries, the cathode is usually made of a chemical compound called lithium-cobalt oxide (iCoO 2 ) or, in more recent piles, of lithium iron phosphate (LiFePO 4 ), to avoid using cobalt, an expensive and scarce chemical element.
The anode is generally made of graphite, a crystallographic variety of carbon. Inside the box, the anode and the cathode are immersed in an organic solvent (the ether is a common solvent) that acts as an electrolyte, inside which the separator is placed. As its name indicates, it separates the positive and negative electrodes, avoiding short circuits between both; it also allows the ions to pass through their micropores.
Currently, There Are Different compositions Of Lithium:
1.Lithium Polymer: Comes in sheets and has an approximate lifespan of 500-600 recharge cycles. Currently used in smartphones, tablets, drones, IPad, etc.
2.LiFePo: Comes in places such as Polymer Lithium, or the form of cylindrical cells similar to those of Lithium Ion, and has an approximate lifespan of 1800 recharge cycles.
3.Lithium Ion: It comes in a cylindrical shape and different sizes. It has approximately, a lifespan of 1000-1200 recharge cycles.
The Lithium Ion is the latest technology that is being used for both high - end cars like Tesla, as batteries for electric vehicles:
· Electric bikes
· Electric scooters
· Electric motorcycles
· Electric cars
· Others-Electric Buses etc.
The most used measure to manufacture batteries is the 18650, 18 mm in diameter x 65 mm in height, and with an approximate weight of 43/46 g x unit. A Lithium Ion cell is distinguished from other batteries in its high charge density(long life) and lightweight.
What Does A Lithium-Ion Battery Made Of?
The lithium-ion batteries are composed of a positive electrode (cathode) in the form of Li2CO3 or LiOH in the case of rechargeable batteries; a negative electrode (anode), lithium in the form of metal in non-rechargeable batteries; a separator; and an electrolyte (Lithium in the form of LiC1). The electrodes immersed in a conductive liquid (electrolyte) are what is known as a cell and the combination of several cells from the battery.
The operation of the battery is produced on the basis of reversible chemical reactions, which provide an exchange of ions and electrons between their poles, which enable the battery to be charged or discharged. At the moment of discharge an electric current is produced capable of moving the electric motor in charge of propelling the vehicle, while at the time of recharging, the ions and electrons return to their original situation from an input of external energy, as to be the breaking of the automobile.
The duration, performance, and behavior of the battery depending on the chemical elements chosen to give rise to the reaction within each cell and the electronics that control the entire discharge and recharge process.
Today there are different types of lithium-ion batteries such as Lithium Cobalt (Li Co O2), Lithium Iron Phosphate (LiFe P O2), Lithium Manganese (Li Mn2 O2), Lithium Nickel Cobalt-Manganese and Lithium-Titanium (Li4 Ti5 O12), which have in common the use of a Lithium Carbon anode, but which differ from each other in the lithium oxide used in the cathode. What makes their technical characteristics vary?
Does Battery Weight Affect Battery Quality?
The actual capacity of a battery is what is indicated as typical, the capacity indicated in the batteries is usually rated by the manufacturer as (Rated), so which is the real one? The real one is usually indicated in the pdf of the cells used or in the description of the battery as typical and is the total capacity of the lithium cell.
If the battery is protected, the discharge of its capacity will never be indicated because the protection of the same ?PCM will cut the supply to 2.75v +/- therefore a good part of the capacity (30% + / -) remains in the lithium cell.
There are many doubts about this information, some manufacturers indicate a value over-dimensioning in capacity and before this two things can happen, or that it is a fake or that the one that indicates is the maximum discharge of the battery or typical value before the cut of the PCM.
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