Organic compounds can be used as lithium ion battery cathode material

Source: 2020 - 04 - 04 13:07 hits: times of organic compounds can be used as anode materials for lithium-ion secondary battery has a lot of research at home and abroad of organic compounds of lithium ion battery cathode materials have a lot of fruitful work, especially in the aspect of oxygen-containing organic conjugated compounds, some high electrochemical activity of oxygen containing functional group and the molecular structure of the active organic compound design has important guidance and reference, which about solving organic cathode material in the electrolyte solubility and low conductivity method also has many place worthy of learning. As the positive active material of organic compound molecules, lithium ion to obtain excellent electrochemical performance, must consider the following three factors: insoluble in electrolyte; ( 3) Has a certain electrical conductivity. At present, the existing research of oxygen-containing organic compounds anode material has carried on many aspects of the improvement measures of conductive agent, sodium lithium/salinization of carbonyl compounds, polymerization process of carbonyl compound, and so on, and achieved certain results. But there are still the following problems: ( 1) Add conductive material and improve the solubility and conductivity to some extent, reflects the performance of a greater degree of organic materials, on the other hand, the conductive agent part of the ability to help, but will increase a lot of conductive material lead to reduce of active material, reduce the electrode capacity, which can lead to irreversible capacity increase; ( 2) Although lithium salt measures can reduce the solubility, can introduce some of the electrochemical activity of Li + - o- Functional groups, results in the decrease of specific capacity. ( 3) Although polymerization process can effectively reduce solubility, but no chemical activity components will be introduced in, such as accidentally repeat) And lead to a drop in specific capacity, and low electrical conductivity polymer and monomer slow ion/big charge repulsion between the electron transfer rate, and polymer swelling and gathered in the process of charging and discharging structure will influence the diffusion rate of lithium ion. In order to solve these problems, at the same time, the future research should be on the basis of existing research, foster strengths and circumvent weaknesses, design some special function structure of organic compounds, such as changing oxygen containing groups conjugated macrocyclic conjugate structure system, which can realize in the process of charging and discharging lithium ion nested and embedded, alternative activity level, achieve higher theoretical specific capacity. Macrocyclic conjugated system on the one hand, can reduce the solubility in the electrolyte lithium ion battery, further improve the lithium ion battery discharge capacity and cycle stability, on the other hand also can improve the electrical conductivity. Green energy and sustainable energy is the development direction of the future, as the world's attention to the sustainable development of energy, organic cells will attract more attention.