Common lithium battery characteristics and parameters

Common lithium battery characteristics and parameters We often talk about ternary lithium batteries or lithium iron batteries, which are named based on active activity data. This article reviews six common lithium battery types and their important functional parameters. As we all know, the technical route of the cell is the same, and its detailed parameters are not the same. This article shows the general parameter level at that time. The six lithium batteries are LiCoO2, LiMn2O4, LiNiMnCoO2 or NMC, LiNiCoAlO2 or NCA, lithium iron phosphate (LiFePO4) and lithium titanate (Li4Ti5O12). The high specific energy of lithium cobalt oxide (LiCoO2) makes lithium cobalt oxide a popular choice for mobile phones, notebook computers and digital cameras. The battery consists of a cobalt oxide cathode and a graphite carbon anode. The cathode has a layered structure. Lithium ions move from the anode to the cathode during the discharge process, while the charging process is reversed. The cathode has a layered structure. During the discharge process, lithium ions move from the anode to the cathode. When charging, current flows from the cathode to the anode. The disadvantages of lithium cobalt oxide are short service life, low thermal stability, and limited load capacity (specific power). Like other cobalt hybrid lithium batteries, lithium cobalt oxide uses graphite anodes, and its cycle life is mainly limited by the solid electrolyte interface (SEI), and is mainly limited by the gradual thickening of the SEI film, and the anode lithium during rapid charging or low-temperature charging plating. Newer information systems have added nickel, manganese, and/or aluminum to increase lifespan, load capacity, and reduce costs. Lithium cobalt oxide cannot be charged or discharged with a current higher than its capacity. This means that the 2400 mAh 18650 battery can only be charged and discharged at a speed lower than 2400 mAh. Forcing fast charging or applying a load higher than 2400mA will cause overheating and overload pressure. Regarding the optimal fast charging, the manufacturer recommends a charging rate of 0.8c or about 2000mA. The battery maintenance circuit limits the charge and discharge rate of the energy unit to a safe level of about 1C. The hexagonal spider diagram (Figure 2) summarizes the detailed energy or capacity function related to operation of lithium cobalt oxide; can supply detailed power or large current; safety; functions are reflected in high and low temperature environments; longevity includes calendar longevity and Long life cycle; cost characteristics. Other important features not shown in the spider chart include toxicity, fast charging ability, self-discharge, and shelf life. Lithium cobalt oxide is being replaced by lithium manganese oxide, especially NMC and NCA, because of the high cost of cobalt, its function is significantly improved when mixed with other active cathode materials. (See the description of NMC and NCA below.) Lithium manganate (LiMn2O4) spinel lithium manganate battery was first published in a data research report in 1983. In 1996, Molipower commercialized a lithium battery with lithium manganate as the cathode. The structure forms a three-dimensional spinel structure, improves the ion activity on the electrode, reduces the internal resistance, and improves the current carrying capacity. Another advantage of spinel is high thermal stability and improved safety, but limited cycle and calendar life. Low internal resistance, fast charging, high current discharge. 18650 battery, lithium manganate battery can be 20-30A current, moderate heat storage. It is also possible to apply load pulses up to 50A for 1 second. Continuous high load under this current will cause heat accumulation, and the battery temperature must not exceed 80C (176F). Lithium manganate is used in power tools, medical equipment, hybrid and pure electric vehicles. Figure 4 shows the formation of a three-dimensional crystal framework on the cathode of a lithium manganate battery. The spinel structure is usually composed of diamond shapes connected to the crystal lattice and usually appears after the battery is formed. 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 are the shortcomings of Ni-MH batteries?