What are the factors that will affect the performance of lithium battery charge and discharge ratio?

资源:other news 日期:2022-10-28 预览: 推荐:锂离子电池批发

　　1. The charging and discharging rate performance of lithium ion batteries is directly related to the mobility of lithium ions in positive and negative electrodes, electrolyte and its interface. All the factors that affect the speed of lithium ion migration (which can be equivalent to the internal resistance of a battery) affect the charge and discharge rate of a lithium ion battery. In addition, the heat dissipation rate inside the battery is also an important factor affecting the rate performance. If the heat dissipation speed is slow, the heat accumulated during the charging and discharging of large-capacity batteries cannot be transferred, which seriously affects the safety and service life of lithium-ion batteries. Therefore, it is of great significance to study and improve the charge-discharge ratio performance of lithium ion batteries, improve the migration speed of lithium ions and the internal heat dissipation rate of batteries. For the internal resistance of lithium ion batteries, conductive agents are usually added inside the active material of the positive electrode to reduce the contact resistance between the active material and between the active material and the collector of the positive electrode matrix, and improve the conductivity (ionic and electronic conductivity) to improve the utilization and performance of the positive electrode material. Different materials and different shapes of conductive agents will affect the internal resistance of lithium-ion batteries, and then affect their amplification performance. The positive and negative collectors (lugs) are carriers of energy transfer between lithium-ion batteries and the outside world. The resistance of the collector also has a great influence on the amplification performance of the battery. Therefore, the rate performance and cycle life of Li-ion batteries can be improved by changing the material, size, extraction method and connection process of the collector.

　　2. In addition, the absorption rate and porosity of the isolation membrane also have a great impact on the passability of lithium ions, and will also affect the rate performance of lithium ion batteries to a certain extent (relatively small). The penetration degree of electrolyte and anode material of lithium ion battery will affect the contact resistance of electrolyte and electrode interface, thus affecting the magnification performance of battery. The total amount of electrolyte, viscosity, impurity content and pores of anode and cathode materials will change the contact impedance between electrolyte and electrode, which is an important research direction to improve the amplification performance. The ionic conductivity of electrolytes The ionic conductivity of electrolytes is the same as the resistance of water, which has a great influence on the swimming speed of lithium ions. At present, organic electrolytes, both liquid and solid, used in lithium-ion batteries are not very ionic conductive. Electrolyte resistance has become an important part of the whole battery resistance, and its influence on the high rate performance of lithium ion batteries cannot be ignored. In addition to improving the ionic conductivity of the electrolyte, we should also pay attention to the chemical and thermal stability of the electrolyte. When charging and discharging at a large rate, the electrochemical window of the cell has a wide range. If the chemical stability of the electrolyte is not good, it is easy to oxidize and decompose on the surface of the cathode material, affecting the ionic conductivity of the electrolyte. The spread of the positive and negative lithium ion battery capacity lithium ion battery embedded embedded and the rate of the anode cathode active material, the lithium ions from the positive cathode active material in escape velocity, or are they from the positive and negative surface active material to find a stable speed, is an important factor to influence than to charge and discharge.