1, Xiang Fenghua: Judging from the compound growth of net profit in the past three years, the compound growth of net profit in the past three years is-14.07%, with a maximum of 201690,000 yuan.
2. The company's main products are divided into two categories: natural graphite and artificial graphite. The products are used in the fields of electric power (electric vehicles, such as new energy vehicles and electric bicycles), 3C consumer electronics, industrial energy storage and other lithium-ion batteries.
3. Zhongke Electric: Judging from the compound growth of net profit in the past three years, the compound growth of net profit in the past three years is 654.38+02.08%, and the highest is 654.38+63.8 million yuan in 2020.
4. china baoan: Judging from the compound growth of net profit in the last three years, the compound growth of net profit in the last three years is 75.94%, and the highest is 666,543.8+0.8 million yuan in 2020.
I. Artificial graphite
Broadly speaking, all graphite materials obtained by high-temperature organic carbonization and graphitization can be called artificial graphite, such as carbon fiber, pyrolytic carbon, foamed graphite and so on. In a narrow sense, artificial graphite usually refers to a block solid material made of carbonaceous raw materials with low impurity content as aggregate and coal tar pitch as binder through batching, kneading, molding, carbonization and graphitization, such as graphite electrode and isostatic pressing graphite.
Second, the main characteristics of artificial graphite
1, crystal structure
Natural graphite: the crystal development is relatively perfect, and the graphitization degree of flake graphite is above 98%, while that of natural microcrystalline graphite is usually below 93%.
Artificial graphite: the degree of crystal development depends on raw materials and heat treatment temperature. Generally speaking, the higher the heat treatment temperature, the higher the graphitization degree. The graphitization degree of artificial graphite produced in industry is usually less than 90%.
2. Organizational structure
Natural flake graphite is a single crystal with simple structure and only crystallographic defects (such as point defects, dislocations, stacking faults, etc.). ), as well as macroscopic anisotropy. Natural microcrystalline graphite has small grains, and the arrangement of grains and holes is disordered after impurity removal, which is isotropic macroscopically.
Artificial graphite: it can be regarded as a multiphase material, including graphite phase transformed from carbon-containing particles such as petroleum coke or pitch coke, graphite phase transformed from coal pitch binder wrapped around particles, pores formed by particle accumulation or heat treatment of coal pitch binder, etc.
3. Appearance
Natural graphite: it usually exists in powder form and can be used alone, but it is usually used after being compounded with other materials.
Artificial graphite: there are many forms, including powder, fiber and block, while artificial graphite in a narrow sense is usually block and needs to be processed into a certain shape when used.
4. Physical and chemical properties
In terms of physical and chemical properties, natural graphite and artificial graphite are both * * *, and their properties are also different. For example, natural graphite and artificial graphite are good conductors of heat and electricity, but for graphite powder with the same purity and particle size, natural flake graphite has the best heat transfer and conductivity, followed by natural microcrystalline graphite and artificial graphite has the lowest. Graphite has good lubricity and certain plasticity. Natural flake graphite has perfect crystal development, low friction coefficient, the best lubricity and the highest plasticity, followed by dense crystalline graphite and aphanitic graphite, and artificial graphite is poor.