Lithium ion batteries are rechargeable batteries that are characterized by very high power densities and the applications in many field grow up rapidly .  

There are four components in a lithium ion cell: anode, cathode, separator, and the nonaqueous electrolyte. Different chemistries are used; the anode is graphite, the cathode is an oxide (LiCoO2), and the alternating layers of anode and cathode are separated by a PP or PE separator, 

The separator is nothing but a porous membrane that separates the anode and the cathode in a lithium ion battery. It allows flow of ionic charge carriers but prevents electrical contact between the electrodes .

The electrolyte consists of an organic solvent and dissolved lithium salt . it provides the media for Li ion transport. Lithium ions move from the anode to the cathode during discharge and The Li ions make the reverse journey during charging. The lithium ion battery (or battery pack) is composed by individual cells packaged together with their associated protection electronics and battery management system.

Good Performance of Lithium Ion Batteries 

The Lithium battery is a family of rechargeable battery types which unlike lithium primary batteries . The lithium ions move from the negative electrode to the positive electrode during discharge and make the reverse journey when charging . Chemistry, performance, cost and safety characteristics vary across lithium-ion battery types. 

Lithium-ion batteries with many characteristic advantages of high energy density, high discharge power, and long service life. Which make a remarkable advance in portable electronics technology and the spread of information technology devices throughout society. Significant improvements in the past few years with respect to performance, safety and lifecycle which now make it at a more lower cost . They are more welcome apply for electric vehicles and small , medium also large-scale storage systems make them a promising solutions .

Obviously , the automotive industry has become a major potential market for the lithium ion battery industry. At the same time, the door has been opened for new players to enter the market.