The difference between several power lithium-ion batteries

Power lithium-ion battery is different? Ternary lithium is the general trend. The core technology of new energy vehicles is the battery to supply energy. Battery technology has reached today's bottleneck. Open for many years, the types of lithium batteries now include lithium manganese oxide, lithium iron phosphate, lithium, lithium cobalt titanate, ternary materials, due to energy functions and rare metals, capital, lithium manganate, lithium titanate and lithium cobalt oxide Batteries have gradually become a niche choice, and lithium iron phosphate and ternary lithium batteries have been more widely used. But what are the differences? What kind of batteries do you have? Today we are going to discuss lithium batteries. Ternary lithium batteryThe full name of the ternary lithium battery is the battery ternary material, which generally refers to the lithium battery using lithium nickel cobalt manganate (Li (NiCoMn) O2, sliding) lithium nickel aluminate or cobalt (NCA) ternary cathode material The ratios of the three different components of, nickel salt, manganese and cobalt salt are adjusted differently, so it is called ternary and contains many different types of batteries. From the difference in appearance, it can be divided into soft batteries, cylindrical batteries and rectangular hard-shell batteries. Its nominal voltage can reach 3.6-3.8v, the energy density is high, the voltage channel is high, the vibration density is high, the cruising range is long, the output power is large, the high temperature stability is poor, but the low temperature function is the best, and the cost is higher. Lithium iron phosphate battery Lithium iron phosphate battery uses lithium iron phosphate (LiFePO4) as the positive electrode material. The use of iron as the battery material is first of low cost, and secondly, it does not contain heavy metals and has low environmental pollution. The working voltage is 3.2v. The lithium iron phosphate crystal is in the PO bond, resulting in zero voltage without leakage. When stored under high temperature conditions or overcharged, the safety is very high, and it can be charged quickly, with high discharge power, no memory effect, high cycle life, and poor low temperature defects. , The tap density of anode material is small, the energy density is low, and the output and consistency of the product are also a problem. These two batteries have their own advantages. The ternary lithium battery ternary material under high temperature conditions will cause decomposition to 200 ℃, violent chemical reactions, release oxygen, and are prone to high-temperature combustion under the influence or blasting phenomenon. Taking safety into consideration, my country’s industry in January 2016 specifically announced regulations to temporarily bind ternary lithium batteries for pure electric vehicles. However, the decomposition temperature of lithium phosphate batteries is 800°C, not to mention a short-term fire, and the safety is relatively high. Under low temperature conditions (the temperature is below -10℃), lithium phosphate batteries decay very quickly. After less than 100 charge and discharge cycles, the battery capacity will drop to 20% of the initial capacity, and the roots are in cold areas where insulating tapes are used. ; And the ternary lithium battery has excellent low temperature performance, can maintain the normal battery capacity under the condition of -30℃, and is more accustomed to the use in low temperature areas in the north. From the perspective of capital, the resources required for the cobalt element of ternary lithium batteries are in our country. Most of the overseas imports are greatly affected by the market and not the company. Therefore, the source of ternary lithium batteries must be high, and do not import batteries. The supply of materials and lithium iron phosphate is satisfactory, the price is stable, and the capital is relatively low. Under the experimental conditions, after 5000 cycles, the remaining capacity of the lithium iron phosphate battery is 84%. After 5000 cycles of 1C (1C represents the current intensity when the battery is fully discharged within 1 hour), the battery can still maintain more than 80% of the initial capacity. After 3900 cycles, the remaining capacity of the ternary lithium battery is only 66%. After 2500 cycles of 1C, the remaining capacity drops to 80% of the initial capacity. In contrast, the cycle life of lithium phosphate batteries is much longer than that of ternary lithium batteries. In addition, the energy density of the lithium iron phosphate battery is 120Wh/kg, which has reached the theoretical limit, while the energy density of the tern battery is 180Wh/kg, and there is still a lot of room in the future. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous article: How to solve the problem of drone battery life?