With the increasing energy density of batteries, the risk of battery thermal runaway is on the rise. From the perspective of thermal runaway, the battery should run below 60 °C, but due to internal short circuit, external heating, mechanical abuse and other factors, the battery temperature rises to 90 °C, at this time, the SEI film on the surface of the negative electrode begins to dissolve, resulting in lithium intercalated carbon directly exposed to the electrolyte, the two react quickly and exothermically, producing a large amount of combustible gas, the separator is then melted, the battery forms an internal short circuit, and the temperature rises rapidly to 200 °C, which promotes the vaporization and decomposition of the electrolyte, the oxygen separation of the positive electrode, and the violent combustion or explosion of the battery.
Why solid-state batteries are safe？
1) Non-flammability and thermal stability: liquid electrolyte is flammable and volatile, with a decomposition temperature of about 200 °C (160 °C for diaphragm), and there are potential safety hazards of corrosion and leakage. The solid-state electrolyte has the characteristics of non-flammable, non-corrosive, non-volatile, etc., the decomposition temperature is greatly increased, and it can operate at higher rates and higher temperatures, while there is no liquid inside and no flow, and the battery can withstand nailing, cutting, cutting, and bending, thereby greatly reducing the risk of thermal runaway.
2) Lithium dendrite: In liquid batteries, the growth of lithium dendrites is easy to puncture the separator, resulting in short circuits, while the solid electrolyte has high mechanical strength, and lithium dendrites grow slowly and are difficult to pierce, thereby improving the safety performance of the battery. #solid-statebatteries #16AHbattery #22.2vbattery #14Slipobattery #dronesbattery #fpvbattery #fpvdrones
