Rechargeable Lithium Battery Can Improve The High Current Charge And Discharge Performance
Whether it is Rechargeable Lithium Battery, lithium-sulfur batteries, or lithium air battery system to improve their energy density is also the key to research and development of high-performance electrode materials, so that the overall performance of the battery system. The inherent characteristics of each battery system, determines the performance of the road is not smooth road. Lithium-ion battery electrode material due to the presence of lithium ion reversible embedded / off, the electrode material in the charge and discharge process by the volume changes, may lead to material powder even from the collector off, thus greatly reducing the battery cycle life. Lithium sulfur battery discharge products polysulfide dissolved in the organic electrolyte to produce a "shuttle effect", resulting in a serious capacity during the cycle of attenuation. Lithium air battery system charge and discharge platform voltage difference, low energy efficiency, high cost of precious metal catalyst, conductive products, poor conductivity and other shortcomings are hindering the practical application of lithium air batteries. Porous carbon composites have the unique advantages of Rechargeable Lithium Battery, lithium-sulfur batteries and lithium-air batteries in the targeted to overcome its shortcomings and practical application. The high conductivity of the carbon material can enhance the electron conductivity of the composite material, in the three battery systems are able to improve the high current charge and discharge performance. Specifically, the lithium ion battery electrode material in the porous carbon channel, the volume expansion can be effectively suppressed, the structural stability can be greatly improved, so that the electrochemical performance can be improved; the sulfur load on the porous carbon substrate , Can effectively inhibit the dissolution of polysulfide, supplemented by a good polysulfide adsorption skeleton design or effective conductive polymer coating, but also can greatly improve the lithium-sulfur battery charge and discharge capacity and cycle performance; porous carbon The supported catalyst material, on the one hand, can provide space to accommodate the discharge product, on the other hand can enhance the activity of the catalyst, reduce the cost for the lithium air battery to provide commercialization possible.
Lithium batteries in use with the release of electricity, voltage drop, the battery's chemical activity will be reduced. In order to better protect the performance of lithium batteries, lithium batteries will generally require charging process by trickle charge (low voltage precharge), constant current charging, constant voltage charging and charging termination of four stages, for control.
Take a battery conventional three-element Rechargeable Lithium Battery, for example, INR26650-50A battery nominal capacity is 5000mAh, the nominal voltage is 3.6V (the market also has a standard 3.7V), discharge termination voltage is 2.75V, charge termination voltage is 4.20 V.
Rechargeable Lithium Battery charger is the basic requirements of the specific charge current and charging voltage, so as to ensure the safe charging of the battery. Add other charging auxiliary function is to improve the battery life, simplify the operation of the charger, including the use of trickle charge to the battery discharge, battery voltage detection, input current limit, the charge is turned off after the charger, the battery part of the discharge after the automatic Start charging and so on.
Rechargeable Lithium Battery charging method is limited voltage constant current, are controlled by the IC chip, the typical charging method is: first test the voltage of the battery to be charged, if the voltage is lower than 3V, first pre-charge, charge current for the set Current of 1/10, the voltage rose to 3V, into the standard charging process.
The standard charging process is: to set the current constant current charging, the battery voltage rose to 4.20V, to constant voltage charging, to maintain the charging voltage of 4.20V. At this time, the charging current gradually decreases, when the current drops to set the charge current of 1/10, the charge is over.