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Comparison of life and safety performance of ternary lithium battery phosphorus and lithium iron acid battery

by:Vglory      2021-05-10
At present, with the continuous improvement of the formula and structure, the nominal voltage of the battery has reached 3.7V, and the battery capacity has reached or exceeded the level of the lithium cobalt acid battery. Compared with lithium iron phosphate batteries, lithium iron phosphate batteries have greater advantages in terms of cycle life. The remaining capacity of the lithium-iron-phosphate battery is 84% u200bu200b(5000 cycles) and 66% (3900 cycles). Taking the remaining capacity/initial capacityu003d80% as the end of the experiment, the 1C cycle life of the lithium phosphate battery pack laboratory is greater than 3500 times, about 5000 times, and the 1C cycle life of the ternary lithium battery laboratory is about 2500 times. At this point in the cycle life, the actual life of a lithium iron phosphate battery pack is much longer than that of a ternary lithium battery. Under the same number of cycles, the remaining capacity of the lithium iron phosphate battery is much greater than that of the ternary lithium battery. Comparison of the safety of lithium ternary batteries: From the point of view of the material system, the analysis temperature of lithium iron phosphate battery pack cathode materials is about 700℃, and the analysis temperature of lithium ternary battery pack cathode materials is about 200℃. In the laboratory environment, short-circuit lithium iron phosphate battery cells will not catch fire. However, ternary lithium batteries are different, they are more likely to ignite. Therefore, ternary lithium batteries have higher requirements for thermal management, and lithium iron phosphate batteries are more adaptable to temperature and safer. Comparison of discharge performance between lithium iron phosphate battery and ternary lithium battery In batteries of the same volume, the positive discharge capacity of the lithium iron phosphate battery pack is 19.4% higher than that of lithium iron phosphate, the specific energy is increased by 37.5%, and the discharge power is increased by 39.7%. Because ternary materials have higher mass specific capacity and compaction density than lithium iron phosphate materials, it is very advantageous to use ternary materials in battery discharge. The discharge capacity of the ternary material battery when discharged at 55°C at room temperature is not clearly different from that of the lithium iron phosphate battery. When discharged at -20°C, the discharge capacity/capacity of the ternary material battery is 15% higher than that of the lithium iron phosphate battery. Comparison of overcharge and overdischarge performance: One of the biggest advantages (theory) of lithium iron batteries is that they are overcharged and overloaded. Under normal circumstances, there is no danger of lithium iron overcharging to 5V in a short period of time, and the immediate release of excess power has no significant impact on performance. However, the manganese battery has an overcharge reaction at 5V, which will cause serious damage to the battery cell. Under over-discharge conditions, the lithium iron battery can return to normal at 0V (the performance is slightly reduced), and the ternary lithium battery system will be scrapped at 0V. According to the above literal explanation, the lithium iron phosphate battery pack has better overshoot and Over discharge performance. So far, ternary lithium iron phosphate batteries and lithium iron phosphate batteries have not been able to distinguish between victory and defeat. Ternary lithium batteries have relatively technical advantages, but at least at this stage, they are not a perfect solution, graphene or fuel power. Alternative energy technologies such as batteries are also nearby. 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: What conductive agents are commonly used in lithium batteries
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