摘要：The low temperature use of lithium-ion battery has low capacity, serious attenuation, poor cycle rate performance, obvious lithium evolution and lithium removal Imbalance and other problems. However, with the continuous expansion of application fields, the low temperature performance of lithium-ion batteries is restricted More and more obvious. At -20℃, the discharge capacity of lithium-ion batteries is only about 31.5% of that at room temperature. Traditional lithium-ion batteries operate at a temperature of - Between 20 ℃ and +55℃. However, in aerospace, military, electric vehicles and other fields, the battery is required to be between -40°C and 60°C Working normally, high-altitude drones and some special equipment for cold climates can experience electric vehicles as low as -60°C Battery systems capable of stable performance in cold regions and hot desert conditions are needed. Therefore, improve lithium ionization The low temperature property of the cell is of great significance.