At present, the main raw materials of lithium batteries are lithium cobalt oxide, lithium nickel oxide and lithium iron phosphate. Many raw materials are lithium cobalt oxide, which has good cycle performance and convenient production. Lithium-ion battery is a secondary battery (rechargeable battery) that uses lithium ions to store and release kinetic energy back and forth between the positive and negative electrodes.
Key materials: positive electrode, negative electrode, lithium battery electrolyte, diaphragm; structure: round, square; laminated, winding; form: polymer (soft packaging), liquid lithium ion (steel shell)
Anode: The cathode material of the battery accounts for 30%-40% of the cost of the lithium battery.
Negative electrode: The negative electrode material of the battery should be composed of raw materials with lower relative potential of the lithium electrode, with higher specific volume and better crossover performance, so as to maintain the stability and reliability of the mechanical equipment during the entire lithium intercalation process.
Lithium battery electrolyte: Lithium battery electrolyte has the function of transferring positive charge between the positive electrode and the negative electrode, which endangers specific energy, power, a wide range of temperature applications, cycle life, safety factor, etc.
Diaphragm: The diameter of the diaphragm should consider a good foundation of positive ions, the ability to absorb liquids to retain moisture and maintain positive ion conductivity, and the dielectric strength of electronic devices to complete the protection of the positive and negative insulating layers of mechanical equipment. In addition, it also needs to have Sufficient puncture compression strength, tensile strength and other physical properties, corrosion resistance and sufficient photoelectric catalytic reliability.
The whole process of discharging: During the whole process, it happens that the lithium-ion battery is reversed back to the positive direction, and the electronic device enters the positive direction and the lithium-ion battery compound type according to the high-power circuit. After the rechargeable battery is charged and discharged, the negative electronic device e runs from the external power supply circuit to a positive level. The positive lithium ion battery li jumps from the negative level into the lithium battery electrolyte, climbs up the zigzag hole in the diaphragm, swims to the positive level, and merges with the electronic devices that have been washed. The greater the charge and discharge current, the smaller the charge and discharge capacity, and the faster the operating voltage decreases.