Overview of Sodium Ion Batteries
In principle, the charging time of sodium ion batteries can be shortened to 1/5 of that of lithium ion batteries. The main feature of sodium ion batteries is to use Na+ instead of expensive Li+. In order to adapt to sodium ion batteries, the positive electrode material, negative electrode material and electrolyte must be changed accordingly. Compared with lithium, the advantage of sodium ion batteries is that they are rich in resources. Sodium resources account for about 2.64% of the earth's crust reserves. In addition, the method for obtaining sodium is very simple, so compared to lithium-ion batteries, sodium-ion batteries will have more advantages in cost.
Although the energy density of sodium-ion batteries is not as good as that of lithium-ion batteries, in view of the current high price of lithium carbonate, sodium-ion batteries still have very broad application prospects: for areas where energy density is not high, such as energy storage in power grids, Peak shaving, wind power storage and other applications are very broad. In the future, sodium-ion batteries will gradually replace lead-acid batteries and be widely used in various low-speed electric vehicles, complementing lithium-ion batteries.
Working Principle of Sodium Ion Battery
Advantages of Sodium Ion Batteries
(2) Due to the characteristics of sodium salt, it is allowed to use low-concentration electrolyte (with the same concentration of electrolyte, the conductivity of sodium salt is about 20% higher than that of lithium electrolyte) to reduce costs;
(3) Sodium ions do not form an alloy with aluminum, and the anode can use aluminum foil as the current collector, which can further reduce the cost by about 8% and the weight by about 10%;
(4) Since sodium ion batteries have no over-discharge characteristics, sodium ion batteries can be allowed to discharge to zero volts.