The expansion process of graphite electrode

The internal battery's vapor is a key reason for the bulging of the battery. Whether the battery is in a normal cycle system, temperature cycle system, and maintained at high temperatures will cause different levels of vapor expansion. Graphite electrodes are made from petroleum coke and needle coke as raw materials, asphalt binder as a melting agent, and processed through forging, seasoning, mixing, pressing, sintering, graphitization, and mechanical processing. They are electrical conductors that release electromagnetic energy in an electric arc in a medium frequency furnace to heat and melt waste materials. According to their quality standards, they can be divided into general output power, high power, and extremely high output power. The key components of graphite electrodes include four types: general output power graphite electrodes, oxidation resistant coated graphite electrodes, high-power graphite electrodes, and extremely high output power graphite electrodes. Graphite rods are commonly used as electric heating elements in high-temperature vacuum furnaces, with a maximum application temperature of 3000 ℃. They facilitate air oxidation at high temperatures and are only used in neutral or oxidizing atmospheres, except for vacuum pumps. Its coefficient of linear expansion is relatively small, its thermal conductivity is high, and its resistor index is (8-13) × 10-6 Ω· m. Its process performance is better than SiC and MoSi2 rods, and it is heat-resistant, resistant to extreme cold and polar heat, and cost-effective. Graphite block is a type of artificially synthesized graphite, which is made by processing techniques such as manual heating of coke products. Generally, if purified to high purity or made into carbon fiber materials, the added value will be higher. It has long been confirmed that the characteristic of causing battery bloating is caused by the dissolution of lithium battery electrolyte. There are two situations of electrolyte dissolution in lithium batteries. The electrolyte is a residue, a metal material residue such as water and dissolved substances in the electrolyte vapor. The other is that the photocatalytic dialogue box of the electrolyte is too low, causing dissolution throughout the battery charging process. Organic solvents obtained after electrolyte EC and DEC, such as electronic devices, will cause oxygen free radicals, which are the immediate result of free radical reactions, resulting in low melting point nitrogen compounds, lipids, ethers, and CO2.

The thickness transition of battery electrodes has the following different conditions:

(1) Cold rolled polarizer, placed after rebound, compacted with thicker rebound and higher relative density; Under the same stress, a larger elastic mold with a larger adhesive and smaller magnetic pole pieces can maintain rebound, and dryness can cause rebound of the pole pieces.

(2) The digestion and absorption of electrode plates and the solubilization of lithium battery electrolyte can increase the thickness of electrode plates.

(3) During the entire charging process of the battery, the lithium intercalation causes an increase in the battery level due to the transformation of the main parameters of the lattice constant.

Detailed introduction of lithium conversion processing technology for graphite anodizing of lithium-ion battery cells and the expansion of anode plates.

The lithiated graphite coin half cell electrode sheet releases lithium for the first time during the entire expansion process shown in Figure 1, such as in the lithium-ion battery with graphite virtual beams. The electrode potential decreases and the thickness of the magnetic pole piece gradually increases, increasing the solubility. Can the entire process be divided into categories? EA has several levels and is equipped with an embedded graphite layer to enhance lithium composition (x gradually increases). LixC6 exists in several different phases, and Table 1 lists some characteristics of this stage. x indicates that LixC6 has a molar composition of lithium chemical substances, and d is the interval between the main parameters of the graphite layer lattice constant. Along with the amount of lithium inclusions, it connects with the graphite phase for 2 hours. When SOC reaches 50% and LiC12 enters, the basic theoretical volume/gram of LiC6372mAh is more and more thoroughly lithiated. This type of change gradually widens the d-interlayer spacing, resulting in an increase in the thickness of the magnetic pole pieces.