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1、锂离子电池基本原理、配方及工艺流程（Basic principle, formulation and process flow of lithium ion battery）This article is contributed by a9htPdf documents may experience poor browsing on the WAP side. It is recommended that you first select TXT, or download the source file to the local view.Principle and process flow
2、of lithium ion batteryA principle of 1 LiCoO2 + + structure cathode conductive agent binder (PVDF) + collector (aluminum foil) 2 + + cathode structure of graphite conductive agent, thickening agent (CMC) + binder (SBR) + collector (copper) anode cathode3 the working principle of the 3.1 charging pro
3、cess: a power to charge the battery, the anode of Electronic E from an external circuit to the cathode, lithium ion is Li+ from the cathode electrolyte, jump over the diaphragm crooked hole, swim to negative electrode and early electronic ran. Together.The positive reaction of LiCoO2? Li1-xCoO2 + xL
4、i+ + Xe (Electronic) negative reaction of 6C + xLi+ + Xe? LixC6 3.2 battery discharge constant current discharge and constant resistance discharge, constant current discharge is in fact the external circuit with a variable resistor can change with the change of the voltage that is the essence of con
5、stant resistance discharge in batteries with a resistor to make electronic through. Thus, as long as the negative electron can not run from the negative to the positive electrode, the battery will not discharge. Electronic and Li+ are at the same time of action, the same direction but different road
6、s, discharge, electron from the cathode to anode through electron conductor, lithium ion Li+ jumped from the cathode electrolyte, passing through the diaphragm crooked hole, swim to the cathode, and early electronic ran with the together. 3.3 charge discharge characteristics of batteries cathode usi
7、ng LiCoO2, LiNiO2, LiMn2O2, LiCoO2 which is a layer of crystal structure is very stable, but when taken x Li ions from LiCoO2, its structure may change, but whether the change depends on the size of X. It is found that when x 0.5, the structure of Li1-xCoO2 is extremely unstable, and crystal collaps
8、e occurs, and its external appearance is the final termination of the core. Therefore, the use of electric core in the process should be limited by charging voltage to control the Li1-XCoO2 value of X, the general charge voltage is not greater than 4.2V, then x is less than 0.5, then the crystal sha
9、pe of Li1-XCoO2 is still stable. The negative C6 itself has its own characteristics, when the first time after formation, the positive LiCoO2 Li was negative charge to C6, when Li returned to LiCoO2 in the cathode discharge, but there must be a part of the Li formation after in the negative C6 cente
10、r, in order to ensure the normal discharge of Li embedded next time, otherwise the electric core overwhelming very short, in order to ensure that there is a part of Li in C6 negative, generally by limiting the discharge lower limit voltage to achieve: charging cap voltage less than 4.2V, the lower d
11、ischarge voltage greater than 2.5V. The principle of memory effect is crystallization, which hardly occurs in lithium batteries. However, the capacity of lithium ion batteries will still decline after repeated charging and unloading, because the reasons are complex and varied. The main change is pos
12、itive and negative pole material itself, from the molecular level, hole structure on negative pole for lithium ions will gradually collapse, blocking; from the chemical viewpoint, is the active anode material passivation, other compounds by the reaction of side. Physically, the cathode material is g
13、radually peeled off. In a word, the number of lithium ions in the battery that can move freely during charging and discharging is reduced. Overcharge and over discharge of lithium ion battery positive and negative pole cause permanent damage, from the molecular level, can be understood intuitively,
14、excessive discharge will lead to excessive release of carbon anode of lithium ion and the lamellar structure collapse, will put too much lithium ion into the carbon anode structure to go over charging, and makes some of the lithium ion never released. The unsuitable temperature will cause other reac
15、tions inside the lithium ion battery to produce compounds that we do not want to see,Therefore, a protective temperature control diaphragm or electrolyte additive is arranged between a plurality of lithium ion battery positive and negative electrodes. When the battery is heated to a certain extent,
16、the composite film hole is closed or the electrolyte is denatured, and the internal resistance of the battery is increased until the circuit is broken. The battery is no longer heating up, and the battery charging temperature is normal. Two formula and process of lithium battery 1. positive and negative formula1.1 positive formula: LiCoO2 + + + liquid adhesive conductive agent (aluminum foil) LiCoO2 (10 m): 96% (Carbon ECP) 2% conductive agent, binder (
