It is understood that lithium-ion batteries are widely used in consumer electronics, new energy vehicles, power tools, energy storage devices and other fields due to their long life, large specific capacity, and no memory effect. However, when traditional lithium-ion batteries operate at low temperatures, there are problems such as serious capacity fading, short cycle life, and difficulty in charging. The operating temperature is limited to between minus 20°C and minus 55°C.
Professor Su Xin told reporters that changing the composition and physical and chemical properties of the electrolyte, thereby improving the ionic conductivity, accelerating the charge transfer process, and slowing down the formation of lithium dendrites has an important impact on improving the low-temperature performance of lithium-ion batteries.
In his view, among various influencing factors, the characteristics of the electrolyte have the greatest impact on the low-temperature performance of lithium-ion batteries. At present, traditional lithium-ion batteries mainly use non-aqueous liquid electrolytes. Low temperatures will increase their viscosity, reduce ionic conductivity, and slow down the diffusion process of lithium ions in the electrolyte. At the same time, the low temperature will also increase the electrochemical polarization of the battery electrodes, accelerate the growth of lithium dendrites, destroy the electrode interface morphology, and seriously affect the battery performance.
The Suxin team has long been committed to the research and development of key materials and industrialization of high-energy density, high-power, and long-life lithium-ion batteries. He believes that liquefied gas electrolytes and local high-concentration electrolytes can become high-quality materials for next-generation commercial lithium-ion batteries. To implement this concept, they have cooperated with Shenzhen Aorui New Energy Technology Co., Ltd. to carry out industry-university-research cooperation, and have initially realized industrialization.