What does the expansion process of graphite electrodes look like?
The vapor of the internal battery is a key cause of the bulging battery, the battery is not in all normal circulatory system, temperature circulatory system, maintained at high temperatures, which will cause different levels of expansion of the vapor.
Graphite electrode key to petroleum coke, needle coke as raw materials, asphalt mastic for fusion agent, by forging, seasoning, mixing and kneading, pressure plate, peening, graphitization, mechanical processing and made, is in the intermediate frequency furnace to electric lone way to release electromagnetic energy on the return to the furnace waste to carry out the warming and melting of the electric conductor, based on the high and low standards of quality, can be divided into the general output power, high power and very high output power. The key of graphite electrode includes four categories of general output graphite electrode, oxidation-resistant coated graphite electrode, high power graphite electrode and its very high output graphite electrode.
Graphite rods are commonly used in the electric heater of high temperature vacuum furnace, the maximum application temperature reaches 3000°C. It facilitates air oxidation at high temperatures, and is only applied in neutralized atmosphere or oxidizing atmosphere except vacuum pumps. It has a small coefficient of linear expansion, thermal conductivity is very large, the resistor index is (8~13) × 10-6Ω-m, process performance is better than SiC, MoSi2 rods, heat-resistant, good resistance to extreme cold polar heat, the price is more cost-effective.
Graphite block a kind of synthetic graphite, and synthetic graphite is coke products manpower heating and other processing technology made. Generally if purified to do high purity, or to do carbon fiber materials, the value added is high. It has long been confirmed that the characteristics of the battery bloating caused by the dissolution of lithium battery electrolyte.
There are two conditions lithium battery electrolyte dissolution, the electrolyte is a residue, metal material residues such as water and electrolyte dissolved material vapor, the other is the electrolyte photoelectrocatalytic dialog box is too low, resulting in the dissolution of the battery during the charging process, the electrolyte EC, the DEC after the acquisition of organic solvents such as electronic devices will cause the oxygen radicals, is the result of the immediate reaction of the free radicals to cause low melting point Nitrogen compounds, lipids, ethers, these CO2.
The thickness shift of the battery electrode is also characterized by the following types of different conditions:
(1) Cold rolled pole piece, resting on the rebound, tamping the relative density of the greater thickness of the greater rebound; the same ground stress, the greater the elasticity of the adhesive mold, the smaller the magnetic pole piece to maintain the rebound, the dryness will cause the pole piece of the rebound.
(2) Pole piece digestion and absorption and its lithium battery electrolyte solubilization, pole piece thickness can be enhanced.
(3) In the whole process of battery charging, because of the transformation of the main parameters of the lattice constant, lithium intercalation caused by level surge.
Details of lithium-ion battery battery graphite anode oxidation of lithium conversion processing technology and anode plate surging.
Lithiated graphite coin half battery electrode sheet, and in Figure 1 shows the whole process of surging, the release of lithium for the first time, such as graphite virtual beam of lithium-ion batteries, the electrode potential decreases, the magnetic pole piece slowly elevated thickness solubilization. The whole process can be categorized into several levels of EA, with the graphite layer placed to enhance the lithium content (x slowly enhance), LixC6 is stored in several types of different phases, Table 1 lists some of the characteristics of the link, x indicates that LixC6 grams of lithium molecular composition of the chemical, d is the graphite layer of the lattice constant of the main parameters of the spacer, accompanied by the amount of lithium inclusions, from the graphite phase successively 2H articulated when SOC 50%, into LiC12, increasingly thoroughly lithiated LiC6, 372 mAh based on the theoretical volume/gram. This type of change, the d-layer spacing slowly expanded, which in turn resulted in Raising the thickness of the magnetic pole piece.
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