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release time:2024-04-11 Hits: Popular:AG11 battery
South Korea develops sodium-ion battery with better performance than LR1130 battery
A research team from South Korea recently demonstrated a new room-temperature and high-energy-density sodium-ion rechargeable battery, using an inorganic fused composite cathode electrolyte based on sulfur dioxide, which can serve as both a sodium-ion conductive electrolyte and cathode material.
Based on the combined mass of the catholyte and carbon electrode, the new sodium-ion battery pack has a discharge capacity of 153 mAh/g and an operating voltage of 3 volts; the battery pack has excellent charge and discharge performance under high current conditions, and its charge and discharge cycle performance is also good. Very outstanding, able to exceed 300 times. Of particular note, the new inorganic liquid electrolyte is flame-resistant and autonomously reconfigurable, helping to accelerate the commercialization of sodium-ion rechargeable battery packs.
The researchers constructed a battery pack containing 2032 sodium-sulfur dioxide button cells, using a sodium metal anode and a porous carbon cathode. The liquid electrolyte material was a composite solution of sodium aluminum chloride and sulfur dioxide. Based on a carbon cathode with a discharge rate of 0.1 Coulomb, the discharge capacity of the battery cell is approximately 1800 mAh/g (or 4.1 mAh/cm2), which is the same as that of conventional commercial lithium-ion batteries (3-5 mAh/ square centimeters) are basically equivalent, and their performance is much superior to previously reported lithium-oxygen batteries and sodium-oxygen battery packs. Even at a high current density with a discharge rate of 5 coulombs, the discharge capacity of the sodium-sulfur dioxide battery pack can reach 897 mAh/g.
However, the energy efficiency between charge and discharge is only about 80%, which needs to be further improved. After multiple charge and discharge cycles, the sodium-sulfur dioxide battery pack has a relatively low storage capacity attenuation rate; the energy is exhausted during each discharge process, and under high coulomb rate and large current charge and discharge conditions, the storage capacity reaches 100 cycles after 100 cycles. 75% of new battery pack.
The chemical process of the battery unit is a highly reversible redox reaction between sulfur dioxide and sodium tetrachloroaluminate. The composite inorganic electrolyte composed of sodium aluminum chloride and sulfur dioxide ensures the reliability of the sodium-sulfur dioxide battery pack, thereby enabling long-term operation of the battery pack. Safety is also guaranteed during the service life.
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