How to choose the lithium ion battery cathode material?

Source: 2020 - 04 - 15 18:55 hits: how to choose the lithium ion battery cathode material? Lithium ion battery anode materials is mainly responsible for in offer lithium ion battery reaction. The choice of the lithium ion battery cathode material generally need to have the following features: ( 1) Material containing the ion of easy oxidation/reduction, such as transition metal; ( 2) The use of the anode material can ensure that Li reversible embedding and embedded, is conducive to a higher energy. ( 3) Because of Li + needs to be reversible nesting and nested, in order to guarantee the stability of cocoa sustainability, need to reversible these materials to embedded in Li +, the main structure do not change; In order to guarantee the whole battery can more stable charge and discharge, request the anode oxidation reduction potential change is small, ensure the battery voltage has not been changed obviously; Ions and electrons in the material with high conductivity, as much as possible to reduce the polarization phenomenon, also can be a battery can have a big electric current charge and discharge; This material has a good stability under normal working environment, try not to react with the electrolyte. 7. Guarantee the lithium ions in the electrode material is easy to spread, to facilitate rapid charge and discharge; Today a good thermal stability; 9. From the point of practical application, this kind of material as cheap as possible, no pollution. Although in theory there is a lot of material to be used as anode of lithium ion battery materials, but in general, the use of the anode material itself do not meet all these conditions. Today the mass market of lithium ion battery material is the same with many years ago, mainly of transition metal oxides. , of course, the researchers are trying to explore and improve the process, as far as possible to optimize the existing the anode material, looking for better the anode material, at present the performance of lithium ion battery cathode material in common use such as shown in table 1, table 1 commonly used anode material performance comparison of the advantages and disadvantages of positive electrode materials for lithium cobalt oxide ( LiCoO2) High capacity ( 138 mah / g) , the loop performance is good, can be large current charge and discharge with limited resources, high prices, poor safety lithium nickelate ( LiNiO2) The highest capacity ( 180 mah / g) Low price, bad circulation, production control difficulty, poor safety spinel lithium manganese acid ( LiMn2O2) Abundant resources, cheap price, the current charge and discharge performance is good, good safety, low pollution less capacity ( 100 - 110 mah / g) , the high temperature damping blocks ( 50 - 60℃) What is the basic principle of lithium ion battery constitute a lithium ion battery of the positive and negative compounds need to be able to make the lithium ion reversible embedding and release. Battery in normal working condition, in order to meet the requirements of the job, metallic lithium battery with ion exist, they can in the internal battery anode materials are normal 'embedded' lattice, and can from the lattice 'out', under the condition of the whole work, they need to be constantly 'embedded' in this way, 'out', so, keep the battery work, play its effectiveness, embedding and appear, don't damage is negative crystal structure.