In recent years, the demand for lithium has been rapidly increasing year by year with the widespread use of lithium batteries. However, the global reserves of lithium are very limited and unevenly distributed, causing the price of raw materials to rise rapidly, and severely restricting the rapid development of my country's low-cost, high-performance energy storage devices. Sodium has physical and chemical properties similar to lithium, and its reserves are abundant and low in cost.

　　Combining the comprehensive advantages of sodium ion and dual-ion batteries, Tang Yongbing's research team has developed a new high-performance, low-cost tin-graphite dual-ion battery based on sodium ion electrolyte. The new battery has an energy density beyond expectations and a longer cycle life, and greatly reduces the production cost of the battery.

　　Research results show that the new sodium-ion dual-ion battery maintains a capacity of 94% after 400 cycles of charging and discharging at a 2C rate; and the energy density can reach 144Wh/kg, which is higher than the energy density of existing traditional lithium-ion batteries.