Analysis of the characteristics of lithium battery cathode materials

Characteristics of Lithium Battery Cathode Materials Lithium batteries are different from other batteries. Compared with nickel-hydrogen batteries, lithium batteries have a higher charge and discharge voltage, which is about 3 times that of nickel-hydrogen batteries, which is 3.7v for nickel-hydrogen batteries and 1.2v for nickel-hydrogen batteries. . Compared with metal lithium batteries, both have higher volume specific energy and mass specific energy, but relatively speaking, the stability of lithium batteries is better than that of metal lithium batteries. In terms of performance and stability, the previous lead-acid batteries and nickel-cadmium batteries are not as good as the currently widely used lithium batteries, and are gradually being replaced by lithium batteries and fuel power batteries. In addition, the volume ratio and mass ratio of lithium batteries are higher than nickel-metal hydride batteries. The working principle of lithium batteries is different from other batteries. For example, in a lead-acid battery system, the reactant is an electrolyte. Between the positive electrode and the positive electrode intercalation material, the positive and negative migration between the electrolyte, therefore, the lithium battery has a name, called the swing battery. How does the lithium battery work? The working principle of the lithium battery is relatively simple. Unloading will break a part of the lithium ions in the anode material, in the electrolyte solution, and insert the lithium ions in the same electrolyte into the cathode material, in the external circuit At the same time, electrons flow from the cathode to the anode, supplying energy to the power source and load. Lithium batteries can also undergo a reversible charging process, which occurs when current or voltage is applied to the positive or negative electrode. The characteristics of lithium battery cathode materials Since the advent of the first lithium battery, research on cathode materials has been ongoing. Various low-cost, high-performance new cathode materials have been extensively studied and discussed. (2) Reduce environmental pollution; strong contact stability with electrolyte; must have strong electrical conductivity; (5) When lithium ions are transferred in the electrolyte, they are inserted and extended in the positive electrode material and can interact with lithium ions. Fast reaction; 6 must be able to have a reversible chemical reaction with lithium ions; must be able to undergo redox reactions containing transition metal elements. After meeting the above requirements, the power and thermodynamic characteristics of the embedded battery system should be considered when designing new anode materials. The morphology and structure of the anode material are also factors to be considered in the design. The influence of particle size on the electrochemical performance of anode materials The diameter, density, morphology and distribution dynamics of the material particles have a great impact. The positive electrode of the battery, the stable cell, it plays an important role in the electrochemical performance, for example, spherical particles Together to form a single spherical particle of spinel, which will enhance the cycle performance of the battery, the chemical reaction with a smaller particle size is faster, because the ion and electron diffusion path of the material reduces the particle size and shortens, but the particle size is too small There are also corresponding disadvantages, such as the tap density will lead to lower energy density, low thermal stability, and less reaction when the electrolyte reacts. In continuous research and analysis, various synthesis methods will synthesize material particles of different sizes, and the proper particle size and morphology will make the performance of the lithium battery better. What is 18650 lithium battery? Many people are asking what is 18650 lithium battery? Let’s break it down to explain: 18650 is actually a size standard, the first one is cylindrical, 18 means the diameter of the cylinder is 18mm, 65 means The height of the cylinder is 65mm; 0 means a cylinder; (3) The technical term for lithium batteries is a lithium secondary battery, which can be used repeatedly for charging and discharging. Therefore, the 18650 lithium battery is an 18 by 65 cylindrical rechargeable lithium battery, which is short for battery, similar to 14500 lithium battery, AA battery, and AAA battery. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete.