The ternary lithium battery or lithium iron battery we often say is the name given to the lithium battery based on the positive active material. This article reviews six common lithium-ion battery types and their main performance parameters. As we all know, the specific parameters of the cells of the same technical route are not completely the same. This article gives the general level of the current parameters. The six kinds of lithium batteries specifically include: LiCoO2, LiMn2O4, LiNiMnCoO2 or NMC, LiNiCoAlO2 (LiNiCoAlO2 or NCA), LiFePO4, Li4Ti5O12.
The rechargeable lithium battery is the most widely used battery in modern digital products such as mobile phones and notebook computers, but it is more delicate and cannot be overcharged or overloaded (it will damage the battery or make it scrap). Therefore, there are protective elements or protective circuits on the battery to prevent expensive battery damage. The charging requirements of lithium-ion batteries are very high. In order to ensure that the terminal voltage accuracy is within ±1%, major semiconductor device factories have developed various power charging ICs to ensure safe, reliable, and fast charging.
Mobile phones are basically lithium-ion batteries. Proper use of lithium-ion batteries is very important for extending battery life. It can be made into flat rectangle, cylinder, rectangle and button type according to the requirements of different electronic products, and several batteries are connected in series and parallel to form a battery pack. Due to material changes, the rated voltage of lithium-ion batteries is generally 3.7V, and the rated voltage of lithium iron phosphate (hereinafter referred to as ferro-phosphorus) cathode is 3.2V. When fully charged, the terminal charging voltage is generally 4.2V, and FeP is 3.65V. The terminal discharge voltage of the power supply is 2.75V ~ 3.0V (the battery factory gives the operating voltage range or terminal discharge voltage, each parameter is slightly different, generally 3.0V, iron phosphate 2.5V). Continue to discharge below 2.5V (iron phosphate 2.0V) is called overdischarge, and overdischarge will damage the battery.
Lithium-cobaltate-type lithium li battery and front electrode are not suitable for high current discharge, because excessive current discharge will reduce the discharge time (higher internal temperature will occur and energy loss), which may be dangerous, but lithium iron phosphate The cathode material lithium battery can be charged and discharged with a high current of 20 C or greater (C is the battery capacity, such as C = 800 mah, 1 C charging rate, 800 mA charging current), which is especially suitable for electric vehicles. Therefore, the maximum discharge current given by the battery manufacturer should be less than the maximum discharge current in use. Lithium-ion batteries have certain requirements for temperature. The charging temperature range, discharge temperature range and storage temperature range given by the factory, overvoltage charging will cause permanent damage to the lithium li battery. The charging current of lithium-ion batteries should be based on the recommendations of the battery manufacturer, and a current limiting circuit is required to avoid overcurrent (overheating). The commonly used charging rate is 0.25C ~ 1C. It is often necessary to check the battery temperature during high-current charging to prevent damage to the battery or explosion due to overheating.
Li-ion battery charging is divided into two stages: constant current charging, to near-end voltage and then to constant voltage charging. For example, for a battery with a capacity of 800mAh, the final charging voltage is 4.2V. In the constant current charging of the 800 mA battery (charging rate 1 c), the battery voltage starts with a larger ramp boost. When the battery voltage is close to 4.2 V to 4.2 V constant voltage charging, the current gradually decreases, and the voltage changes little. The charging current is 1/10-50 c (GeChang has different values and does not affect the use), which is close to full and may terminate charging (start time, 1/10 c after the end of some charger charging years).