Explain the basic principles and performance of lithium-ion batteries in detail

You must understand the basic principles and performance of lithium-ion batteries. The new green battery is a high-performance, non-polluting battery that has been put into use or is being developed in recent years. Lithium-ion batteries, nickel-hydrogen batteries, mercury-free alkaline zinc-manganese batteries, lithium or lithium-ion plastic batteries, fuel power batteries, electrochemical energy storage supercapacitors, etc. are widely used in new green batteries. With the rapid development of the electronic information industry and people’s increasing attention to the relationship between energy and the environment, light, safe, non-toxic, and high specific energy reversible energy materials have begun to receive more and more attention. The development of lithium-ion batteries also conforms to this trend [1-5]. Lithium-ion batteries refer to secondary batteries in which lithium ions are repeatedly intercalated and deintercalated with positive and negative electrode materials through an electrolyte. Compared with traditional nickel-cadmium batteries and nickel-hydrogen batteries, it has the advantages of high working voltage, high energy density, low self-discharge rate, and wide operating temperature range. Electrolyte is an important part of lithium-ion batteries. Compared with traditional organic liquid electrolyte materials, polymer electrolyte materials have the following advantages: improved safety; shapes can be designed flexibly and so on. As the energy storage system of electric vehicles, lithium-ion batteries have high safety, good performance and low cost. During my country's Tenth Five-Year Plan period, great progress has been made in the research of high-power and high-energy lithium-ion batteries, which promoted the research and application of high-safety, low-cost lithium-ion battery materials. Lithium-ion battery is a new type of battery energy. It does not contain lithium metal. During charging and discharging, only lithium ions move between the positive and negative electrodes, and the electrodes and electrolyte do not participate in the reaction. The energy capacity density of lithium ion batteries can reach 300Wh/L, and the weight capacity density can reach up to 300Wh/L. Lithium-ion batteries generally use 24-hour self-discharge to quickly test their charge retention capabilities. The battery is discharged with 0.2~3.0v, and charged with constant current and constant voltage of 1C~4.2v. Cut-off current: 10 horses, 15 minutes after shelving, 1c discharge to measure its discharge capacity C1 to 3.0V, then the battery is charged with 1c constant current and constant voltage to 4.2V, horse 10 cut-off current, 1c, let sit for 24 hours and test capacity C2 , C2/C1*100% should be greater than a new battery for more than 12 hours of charging. It is indeed the previous decline from nickel batteries, nickel cadmium (Ni-Cd) and nickel metal hydride (NiMH batteries), but in the advancement of technology, At the end of the lithium-ion battery, you should never do this at all! Even if it is overcharged and discharged, lithium-ion batteries are harmful. Many products (mobile phones, digital cameras, satellite navigation) require you to charge for more than 12 hours at the first time. , Really to ensure safety, because these products are transported from the factory to the sales to the user's hands, this process may take several months, and the period of time for these batteries may be lost and cause power drops, so in In the initial specification, it is usually recommended that you connect the charger first and charge it for more than 12 hours. It is really to prevent that when you pick up the device and start playing, if the battery you play is lower than 2.5V, then the battery will be broken. That's it! So the original factory will charge you for 12 hours. This is actually to prevent users from accidentally causing the 18650 lithium-ion battery to run out and develop good habits. Don't wait until it is completely empty before charging, and don't continue to overcharge for a long time. . Lithium ion is relatively shallow. Of course, for ordinary users, it is very difficult to always remember when to charge or close the software and other power-saving operations. Doctor Jinshan can achieve this goal through one-key intelligence, and according to the actual situation of the user Customized system mode is provided for living habits to help users use mobile phone power more reasonably. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete the previous one: Li-ion battery charger Production process