AG6 battery.A new high-performance, low-cost sodium-type dual-ion battery was successfully developed

　　Recently, Tang Yongbing, a researcher at the Functional Thin Film Materials Research Center of the Institute of Integration, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, and his research team successfully developed a new high-performance, low-cost sodium-type dual-ion battery, which is expected to replace the existing lithium-ion technology and realize Industrialization. Related research resultsA

　　Recently, Tang Yongbing, a researcher at the Functional Thin Film Materials Research Center of the Institute of Integration, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, and his research team successfully developed a new high-performance, low-cost sodium-type dual-ion battery, which is expected to replace the existing lithium-ion technology and realize Industrialization. Relevant research results ANovelTin-GraphiteDual-IonBatteryBasedonSodium-IonElectrolytewithHighEnergyDensity ("A new tin-sodium graphite high energy density dual-ion battery") has been published online in the international journal "Advanced Energy Materials" (DOI: 10.1002/aenm.201601963) , and applied for 1 international invention patent (PCT/CN2016/081309).

　　Lithium-ion batteries have been widely used in portable electronic devices, energy storage equipment and other fields. However, as lithium-ion batteries are gradually used in smartphones, electric vehicles and other fields, the demand for lithium is rising rapidly year by year. However, the global reserves of lithium are very limited and unevenly distributed, resulting in a rapid rise in raw material prices, which seriously restricts my country's low-cost , the rapid development in the field of high-performance energy storage devices. Because sodium has similar physical and chemical properties to lithium, is abundant in reserves, and has low cost, secondary battery systems based on sodium ions have attracted widespread attention.

　　Combining the comprehensive advantages of sodium-ion and dual-ion batteries, Tang Yongbing and his team members Sheng Maohua, Zhang Fan, Ji Bifa and others successfully developed a new high-performance, low-cost tin-graphite dual-ion battery based on sodium-ion electrolyte . The battery directly uses tin foil as both the negative electrode and current collector of the battery, and graphite as the positive electrode; the electrolyte uses cheap and easily available sodium hexafluorophosphate as the sodium salt electrolyte dissolved in an organic solvent. The new battery has unexpected energy density and long cycle life, and significantly reduces battery production costs. The reaction mechanism of this new battery is: during charging, the sodium ions in the electrolyte move to the surface of the tin foil negative electrode to form a sodium-tin alloy, and at the same time hexafluorophosphate is intercalated into the positive electrode graphite; during discharge, the sodium-tin alloy on the negative electrode is desodiumized , and at the same time, the hexafluorophosphate radicals in the cathode graphite are deintercalated back into the electrolyte. Research results show that this new sodium-ion dual-ion battery still maintains 94% of its capacity after 400 cycles of charge and discharge at 2C rate; and its energy density can reach 144Wh/kg, which is higher than the energy density of existing traditional lithium-ion batteries. The research results have great industrialization prospects and are expected to replace existing traditional lithium-ion battery technology.

　　This research was funded by the Guangdong Provincial Innovation Research Team, Guangdong Provincial Science and Technology Plan Project, Shenzhen Science and Technology Plan Project, and the National Natural Science Foundation of China.

　　Low temperature lithium iron phosphate battery 3.2V 20A -20℃ charging, -40℃ 3C discharge capacity ≥70%

　　Charging temperature: -20~45℃ -Discharge temperature: -40~+55℃ -40℃ Support maximum discharge rate: 3C -40℃ 3C discharge capacity retention rate ≥70%