Lithium ion battery down the main reason for reducing the number of electric capacity at low temperature

Source: 2020 - 04 - 04 12:56 hits: battery using the lithium ion battery capacity to reduce the influence of low temperature environment of the main reasons are: the electrolyte conductivity is poor, the wettability of the diaphragm and/or poor permeability, lithium ion migration velocity is slow, the electrode/electrolyte interface charge transfer speed is slow, etc. In addition, the impedance of the SEI at cryogenic temperatures increase, slows down the speed of lithium ions through the electrode/electrolyte interface. SEI impedance increase is the cause of lithium ion easy to escape from the cathode at low temperature, difficult to embed. Can appear when charging, lithium metal and react with the electrolyte, form the new SEI film covering on the SEI film originally, lead the impedance of the battery, battery capacity [ 19] Decline. Lian-xing et al. [ 20] At 60 ℃ and room temperature to 300 times charging and discharging lithium battery with batch cycle experiment. In the initial stage, the battery at 60 ℃ showed higher discharge capacity. But with the development of circulation, battery capacity attenuation speed and cycle stability is reduced, can appear even late battery inflation. Under high temperature, the lithium ion battery charge and discharge cycle is not stable. High temperature rise in battery electrode electrochemical polarization, produce gas, causing bulging phenomenon. At the same time, the charge transfer resistance increases, the dynamics of ion transfer performance degradation. Use of lithium ion battery when the normal operation of equipment in the transport or could be affected by the vibration, shock, impact and other tests. Some lithium battery with communication system for charging and discharging, and according to certain frequency receiving data information. Frequency of equipment vibration may interfere with the frequency of the battery, causing chip data errors or trigger protection circuit action [ 22] 。 Lithium-ion battery electrodes ear, external wires and terminals, solder joints under the strong vibration or shock will break or fall off, battery electrode active material will fall off, which affects battery life, and even cause dangerous situation. The influence of the circulation in the process of charging and discharging system of lithium ion battery using process is a process of charging and discharging cycle. Charge and discharge system, such as the choice of the size of the charge and discharge current, charge and discharge cut-off voltage and the way of charging and discharging, cycle life of lithium ion battery has very important influence. Blindly for increasing the working current of the battery, charging by the voltage, reduce the discharge by the voltage, reduces the performance of the battery. Conclusions through the analysis we can see that the lithium ion battery in the process of design, manufacture and use, there are many factors which can influence its cycle life. The applied more and more widely, the lithium ion battery to lithium battery has higher requirement on the quantity and quality. Cycle life directly affects the use of lithium ion battery time and quality. Only in the heart of the research and development and production process to grasp, the factors that affect the life cycle of enterprise to occupy the initiative position in the intense market competition. Consumers should be paid attention to in the process of using the characteristics of lithium ion battery, according to the directions the correct use of the battery.