Comprehensive analysis of lithium polymer batteries

Li-polymer battery (Li-polymer, also known as polymer lithium battery): Compared with other lithium batteries, it is a kind of battery with high energy, miniaturization and light weight. In terms of shape, the lithium polymer battery has the characteristics of ultra-thin, and can be made into batteries of different shapes and capacities in accordance with the requirements of some products. This type of battery has a small thickness of 0.5mm. 1; Principle Lithium batteries currently have two types: liquid lithium batteries (LIB) and lithium polymer batteries (PLIB). Among them, the liquid lithium battery refers to a secondary battery in which Li+ intercalation compounds are positive and negative electrodes. The positive electrode uses lithium compounds LiCoO2, LiNiO2 or LiMn2O4, and the negative electrode uses lithium-carbon intercalation compound LixC6. The typical battery system is: (-)C|LiPF6EC+DEC|LiCoO2(+) The positive electrode reaction: LiCoO2u003dLi1-xCoO2+xLi++ xe- negative electrode reaction: 6C+xLi++xe-u003dLixC6 battery total reaction: LiCoO2+6Cu003dLi1-xCoO2+LixC6 The principle of lithium polymer battery is the same as that of liquid lithium, the important difference is that the electrolyte is different from liquid lithium. The essential structure of the battery includes three elements: positive electrode, negative electrode and electrolyte. The so-called lithium polymer battery means that at least one or more of these three critical structures use polymer materials as the critical battery system. In the lithium polymer battery system developed, polymer materials are critically applied to positive electrodes and electrolytes. Cathode materials include conductive polymer or inorganic compounds commonly used in lithium batteries. The electrolyte can use solid or colloidal polymer electrolytes, or organic electrolytes. Generally, lithium ion technology uses liquid or colloidal electrolytes. The need for a sturdy secondary packaging to contain the flammable active ingredients adds weight and also limits the flexibility of size. The shape of the new generation of lithium polymer batteries can be achieved theoretically, and the shape is diversified, which improves the flexibility of battery shape design, so that it can be made into batteries of some shapes and capacities according to product requirements, and is suitable for application equipment. The developer provides a high degree of design flexibility and adaptability in the power processing method to optimize the performance of its products. At the same time, the unit energy of lithium polymer batteries is 10% higher than that of ordinary lithium batteries. Its capacity, cycle life and other aspects are greatly improved compared with lithium batteries. Lithium batteries are produced and customized 2; type working principle Li polymer batteries use file alloys as the positive electrode, and use polymer conductive materials, polyacetylene, polyaniline or poly Phenol is used as the negative electrode, and the organic solvent is used as the electrolyte. The specific energy of the lithium polyaniline battery can reach 350W.h/kg, but the specific power is only 50-60W/kg, the operating temperature is -40-70 degrees, and the life span is about 330 times. 3; Features Related to lithium batteries, the characteristics of lithium polymer batteries are as follows: 1. Relatively, the problem of battery leakage is improved, but it has not been completely improved. 2. Can be made into a thin battery: With a capacity of 3.6V250mAh, its thickness can be as thin as 0.5mm. 3. The battery can be designed into a variety of shapes. 4. It can be made into a single high voltage: a liquid electrolyte battery can only obtain high voltage by connecting several batteries in series, while a polymer battery can be made into a multi-layer combination within a single battery to achieve high voltage because there is no liquid. 5. The discharge capacity is theoretically 100% higher than that of a lithium battery of the same size. 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 article: Cylindrical batteries for new energy vehicles are good Or is the soft pack battery better?