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.

Lithium-ion batteries have been introduced into the domestic market since their birth in the 1990s. In the first 10 years, Japan and South Korea's lithium-ion battery production has been an absolute advantage; Since then, China's lithium-ion battery technology has made great progress, and the industrial scale has exceeded Japan and South Korea, becoming the world's largest producer and user of lithium-ion batteries.

In 2022, under the background of dual-carbon, electric vehicles and energy storage industry ushered in the first Never had the opportunity to grow. Total global lithium-ion batteries for electric vehicles and energy storage batteries in 2022 957.7GWh, a year-on-year increase of 70.3%. Automotive power battery 684.2GWh, an increase of 84.4%; Energy storage battery 159.3GWh, an increase of 140.3%; Small battery 114.2GWh, down 8.8% year-on-year. Chinese lithium The output of ion batteries is 660.8GWh, an increase of 97.7%, accounting for the global total 69.0%. In 2022, China's energy storage lithium battery 130GWh, including power storage, household Energy storage and portable energy storage were 92GWh, 25G Wh and 4GWh, respectively, an increase of 216.2%, 354.5% and 207.7%

In recent years, the global lithium battery industry has grown significantly, and in 2022, lithium-ion batteries have exceeded 948.1 GWh, with Moved the positive electrode material development. But currently commercial positive electrodes such as lithium cobaltate (LCO), lithium manganate (LMO), Ternary materials (NCM/NCA) and lithium iron phosphate (LFP) still cannot meet the requirements for higher energy density, Low cost demand.