Lithium battery aging degree effect on the performance of the battery

Source: 2020 - 03 - 23 15:33 the hits: lithium battery aging system impact on battery performance for different battery systems, such as three yuan is/graphite anode of lithium batteries, lithium iron phosphate anode/graphite cathode lithium battery or lithium titanate battery, should be based on concrete data and the features of lithium-ion batteries. Lithium battery production process can be divided into three stages: before the electrode manufacture, intermediate after encapsulation and the activation of cells of the battery. Battery activation stage aim is to make active material and electrolyte in the battery fully activated, electrochemical stability. Activation stage includes prefi lled, formation, aging and constant volume. Preliminary charging and converting the purpose is to make the positive and negative data in the first few times, activate the data, make the best use of the data. Several before aging intention: one is to let the electrolyte moisture more prominent, is conducive to the stability of cell function. Second, after speculation the positive and negative active material aging, it can promote the acceleration of some side effects, such as gas, such as the differentiation of the electrolyte, lithium battery of the electrochemical function quickly achieve stability; Third, after a period of aging choose lithium battery. The battery voltage is not stable, after the formation of contrary to the actual value of the measured value and the battery voltage after aging, internal resistance is more stable, easy to choose high electric batteries. The main factors influencing the lithium battery performance has two, namely, aging temperature and aging time. In addition, the aging of cells in the seal is still in an open position is more important. On opening, such as can control the humidity, but Chen hua after sealing. If choose high temperature aging, sealed after aging effect is better. For different battery systems, such as three yuan is/graphite anode of lithium batteries, lithium iron phosphate anode/graphite cathode lithium battery or lithium titanate battery, should be based on concrete data and the features of lithium-ion batteries. In experimental design, according to different capacity lithium battery, different internal resistance and pressure drop characteristics, determine the optimal criterion of ageing. One, three lithium or anode/graphite anode of lithium iron phosphate batteries ternary anode material, graphite as the anode material of lithium-ion batteries, lithium-ion battery prefi lled into phases will form a solid electrolyte layer of graphite anode membrane ( SEI) To form the membrane potential of 0. 8 V, SEI ion penetration and promised not to allow electronic transfer, thus forming the thickness must be resisted after further differentiation of the electrolyte, can prevent the electrolyte cell differentiation. But, after the formation of SEI compact structure, small pore, battery aging again help restructuring SEI structure, the formation of porous membrane, thus facilitating the function of lithium-ion batteries. Three yuan/graphite lithium battery aging generally choose the normal temperature aging - 7 28 days, but some plant selection standard, high temperature aging for 1 - aging time Three days, the so-called high temperature in 38 ℃ - commonly 50 ℃. High temperature aging just in order to shorten the production cycle, its purpose is the same as the normal temperature aging, in order to make the positive, negative, membrane, electrolyte rich chemical reaction equilibrium, let the lithium battery to achieve more stable state.