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Experimental Research on the Performance of Lithium Iron Phosphate Battery

by:dcfpower     2021-03-29
Experiment summary: Compared with traditional aqueous secondary batteries, such as lead-acid, nickel-metal hydride and nickel-cadmium batteries, lithium iron phosphate lithium-ion batteries have the advantages of long cycle life and high energy density. At the same time, the batteries also have high safety. , Among various battery systems, lithium iron phosphate batteries have become the most promising battery system. Therefore, lithium iron phosphate batteries have been widely used in electric vehicle power supplies, large-scale energy storage, communication base stations, and electric bicycles. Although the same electrochemical system is used, the performance of the battery is often different due to the difference in battery structure design. The performance of the battery designed with the lean liquid flexible packaging structure is even better. In the production process, the excess electrolyte is extracted after the battery formation process is completed. The remaining electrolyte in the battery is stored in the micro pores of the separator and the positive and negative plates, and there is almost no flow, but at the same time it can guarantee The normal use of the battery minimizes the hidden danger of burning caused by the electrolyte. When the battery is overcharged, the gas produced by the decomposition of the electrolyte is also very small. Due to the flexible packaging design, the battery only slightly swells at this time, avoiding the risk of explosion. At the same time, this structure further improves the energy density of the battery. In this paper, the cycle life, high-rate charge-discharge performance, acupuncture safety and weight energy density of lithium iron phosphate lithium-ion batteries are studied to lay a theoretical foundation for the further application of such batteries. Experimental process: Lithium iron phosphate cathode material (Henan Huanyu Group, Xinxiang), Ks-l5 conductive graphite (produced in Switzerland) and polyvinylidene fluoride (produced in Jiangsu, 99.9%) according to the mass ratio of 89:4:7 and appropriate amount N-methylpyrrolidone (Nanjing, 99.9%) is mixed to make electrode slurry, and then coated on 20 m thick aluminum foil (Shenzhen, 99.9%), dried at 110°C and cut into pieces Make a positive electrode sheet; combine graphite (Henan Huanyu Group, Xinxiang) and Ks-15 conductive graphite (produced in Switzerland) with polyvinylidene fluoride (produced in Jiangsu, 99.9%) according to the mass ratio of 92:3:5 and an appropriate amount of N Monomethylpyrrolidone (Nanjing, 99.9%) is mixed uniformly, and then coated on a 12 m thick copper foil (Hunan, 99.99%), 110 is dried to make a negative electrode; with celgard 2400 film (in the United States) Produced) is a diaphragm, and the electrolyte is LB3564 type electrolyte (produced in Zhangjiagang), which is made of a lithium iron phosphate battery by a lamination process. The electrochemical performance of lithium iron phosphate battery was tested with Arbin battery comprehensive test system (USA). The results of the experiment will be published in follow-up articles, please stay tuned:

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