About the cycle of lithium iron phosphate battery performance analysis

Source: 2020 - 04 - 12 all the hits: time cycle performance of lithium iron phosphate batteries ( The experimental results) As one of the key components of the electric car battery, its cost even half of the cost of the electric car, so battery life directly determines the use cost of electric vehicles. Due to the positive and negative material lithium iron phosphate power battery chemistry stability, small volume and stress changes in the process of charging and discharging, so very long cycle life. As can be seen from the figure 1, 2 o Ah lithium iron phosphate battery charging to 3 C multiplier current. 65 v, and then become a constant pressure, until the current drop to zero. 02c。 2, 1 c discharge current cut-off voltage. 0 V( Charge and discharge depth of 100%) Cycle life. As can be seen from the figure 1, after more than 1600 cycle, the residual capacity of battery is still more than 80% of the original capacity. Although the lithium iron phosphate battery costs remain relatively high, but the extension of battery life will significantly reduce the use of electric cars and maintenance costs. Lithium iron phosphate battery performance experimental research abstract: the experiment with the traditional such as lead-acid, nickel-metal hydride, nickel cadmium solution compared to secondary battery, lithium iron phosphate battery has long cycle life, high energy density, high security advantages. Among various kinds of battery, lithium iron phosphate batteries are the most promising battery system. Therefore, lithium iron phosphate battery has been widely used in electric power, large storage, communication base station, electric bicycles, and other fields. While using the same electrochemical system, but because of the different cell structure design, the performance of the battery difference is very big. The performance of the thin liquid flexible packaging structure is better. In the production of the battery, the battery formation process is completed, redundant electrolyte can be extracted. Inside the battery of the rest of the electrolyte is stored in the microporous L of diaphragm and the positive and negative plates, little flow, but to ensure the normal use of the battery, minimize the electrolyte caused by burning potential danger. When the battery overcharge, electrolyte solution and produce very little gas. Due to using the flexible packaging design, the battery only slightly convex, avoid the explosion hazard. This structure is also further increase the energy density of the battery. In this paper the cycle life of lithium iron phosphate batteries, high rate charge-discharge performance, acupuncture, weight, safety and energy density are studied, for the iron phosphate lithium battery which lay a theoretical foundation for further application. The experimental process: lithium iron phosphate cathode material ( Henan xinxiang huanyu group) ,Ks - L5 conductive graphite ( Switzerland) And polyvinylidene fluoride ( Jiangsu, 99. 9%) , according to the quality than 89:4:7 and the right amount of N methyl pyrrolidone ( Nanjing, 99. 9%) And electrode paste, and then apply to 20 m thick aluminum foil ( Shenzhen manufacturing, 99. 9%) In 110 ℃ drying cuttings and positive plate; Graphite ( Henan xinxiang huanyu group) And Ks - 15 conductive graphite ( Switzerland) And polyvinylidene fluoride ( Jiangsu, 99. 9%) , according to the quality than 92:3:5 and the right amount of N methyl pyrrolidone ( Nanjing, 99. 9%) Mixed evenly coated in 12 meters thick copper foil ( Hunan, 99. 99%) 110 after drying, the cathode block; Diaphragm choose american-made Celgard2400 membrane, electrolyte, select LB3564 from zhangjiagang electrolyte.