What Are The Roles Of Diaphragm And Electrolyte In Lithium Battery Production Materials.

- Jul 17, 2019-

Now the production of lithium  battery core key materials are 4 kinds: anode,cathode,diaphragm and electrolyte. Current lithium battery costs are  mainly diaphragm and electrolyte. Lithium battery electrolyte is the carrier of ion transfer in battery. It usually consists of lithium and organic solvents. The diaphragm has always been the highest gross margin of the 4 materials.


The action of electrolyte:lithium battery electrolyte is not to be ignored, after all,accounting for 15% of the battery cost of electrolyte and indeed in the battery energy density, power density,wide temperature application,cycle life,safety performance and other aspects paly a crucial role. Electrolyte is known as the "blood" of lithium ion battery, play the role of conducting electrons between anode and cathode in the battery,is the guarantee of lithium battery to obtain high voltage,high specific energy and other advantages. The electrolyte is generally made of high purity organic solvent,lithium electrolyte salt, necessary additives and other raw materials in a certain proportion under certain conditions. The  main electrolytes used are lithium perchlorate,lithium hexafluorophosphate and so on. The electrolyte fills the inside of the battery shell, soaking both the anode and cathode and diaphragm. On the one hand, the electrolyte provides some active lithium ions, which are used as conductive ions in the charging and discharging process. On the other hand,it provides an ion channel or called "carrier",through which the lithium ions can move.


The action of diaphragm:the performance of diaphragm determines the interface structure and internal resistance of the battery,which directly affects the capacity,circulation and safety performance of the battery. The diaphragm with excellent performance plays an important role in improving the comprehensive performance of the battery. The main function of the diaphragm is to separate the cathode and anode electrodes of the battery,prevent the contact between the two poles and short circuit,and it has the function of enabling electrolyte ions to pass through. In addition, as the electrolyte is an organic solvent, so the diaphragm must have the performance of organic solvent resistance. Lithium battery diaphragm of ionic conduction ability is directly related to the overall performance of the battery,its isolation are negative role to  make the battery overcharge or temperature conditions can limit the increase of current,to prevent an explosion caused by short circuit batteries,with Micro porous self-closing protection,have the effect of security protection of battery users and equipment.