Ternary polymer lithium batteries are lithium batteries that use ternary cathode materials, such as lithium nickel cobalt manganese or lithium nickel cobalt aluminum oxide. There are many types of cathode materials for lithium-ion batteries, mainly including lithium cobalt oxide, lithium manganese oxide, lithium nickel oxide, ternary materials, and lithium iron phosphate. So what are the advantages and disadvantages of ternary polymer lithium batteries?
Advantages of ternary polymer lithium batteries
Materials that offer a good balance between capacity and safety have better cycle performance than standard lithium cobalt oxide. In the early days, due to technical limitations, their nominal voltage was only 3.5-3.6V, which restricted their application range. However, with continuous improvements in formulation and structure, the nominal voltage of these batteries has now reached 3.7V, and their capacity has reached or exceeded that of lithium cobalt oxide batteries.
1. Ternary lithium batteries have high energy density, exceeding 200Wh/kg.
2. High Voltage Platform: The voltage platform is a crucial indicator of battery energy density, determining the battery's basic performance and cost. Therefore, it is of great significance for the selection of battery materials. A higher voltage platform means a larger specific capacity. For batteries of the same size, weight, and even ampere-hour, ternary lithium batteries with a higher voltage platform will have a longer driving range.
3. The biggest advantage of ternary polymer lithium batteries is their relatively high energy density compared to lithium iron phosphate batteries. However, a significant drawback of ternary lithium batteries is their lower ignition point when exposed to impact or high temperatures. Therefore, ternary lithium batteries require stringent protection measures; please handle them with care to prevent accidents.
Disadvantages of ternary polymer lithium batteries
1. Low output efficiency: Tesla uses NCR18650A type batteries with a typical capacity of 3070mAh. The continuous discharge current can only reach 2C, and the discharge effect is best at 2C.
2. Rapid capacity decay and short lifespan
3. Poor safety performance: Large-capacity ternary lithium batteries often fail safety tests such as nail penetration and overcharge. They also have poor high-temperature resistance, resulting in unstable high-temperature structures and poor high-temperature safety. Furthermore, excessively high pH values can cause individual cells to swell and release gas.
4. Short cycle life and poor high-power discharge performance.
5. The elements are toxic. The temperature of ternary lithium batteries rises sharply after high-power charging and discharging. After reaching high temperatures, the released oxygen is extremely easy to burn.
Lithium-ion batteries, as energy storage devices integrating high energy density and high voltage, have been widely used in mobile and wireless electronic devices, power tools, hybrid power vehicles, and electric transportation. However, lithium manganese oxide batteries suffer from low energy density, poor cycle stability at high temperatures, and poor storage performance, thus serving only as the cathode material for the first generation of international power lithium batteries. Meanwhile, ternary lithium-ion batteries, due to their combined advantages in performance and cost, are increasingly gaining industry attention and recognition, gradually surpassing lithium iron phosphate and lithium manganese oxide to become the mainstream technology. Ternary lithium-ion battery cells have replaced the widely used lithium cobalt oxide cells and are widely used in the laptop battery field.
