The influence of charge transfer resistance on low-temperature performance.LR44 battery

　　The charging and discharging process of lithium-ion batteries includes not only the transport of lithium ions in the solid-liquid phase, but also the charge transfer process at the electrode/electrolyte interface. The magnitude of the resistance experienced in this process is called the charge transfer resistance, also known as the electrochemical reaction resistance. The greater the resistance of an electrochemical reaction, the less likely it is to occur. In other words, if the same current is generated, the greater the resistance of the electrochemical reaction, the greater the required overpotential, that is, the greater the driving force required. Zhang et al. studied the low-temperature performance of lithium-ion batteries using anode and cathode symmetric batteries. The results indicate that under room temperature and low temperature conditions, electrochemical reactions are the speed control steps of the entire lithium-ion battery charging and discharging process. When the temperature is below -10 ℃, the decisive factor is more significant. Replacing LiPF with LiBF to improve the low-temperature performance of batteries. Although LiBF based electrolytes have lower ionic conductivity compared to the corresponding LiPF based electrolytes, their relative low-temperature performance is better. The reason for this is that LiBF reduces the charge transfer resistance of the battery. The factors that affect the low-temperature performance of lithium-ion batteries are relatively complex, and there is currently no unified conclusion. The SEI film resistance, interface charge transfer resistance, and diffusion coefficient inside the lithium-ion storage electrode may all be the main factors affecting the low-temperature performance of lithium-ion batteries in specific systems. In addition, factors such as electrode surface area and porosity, electrode density and thickness, affinity of binders to electrolyte, porosity and wettability of separators, etc., may become the main factors affecting the low-temperature performance of lithium-ion batteries in special circumstances.

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