Organic compounds can be used as cathode materials for lithium batteries

Organic compounds can be used as anode materials for lithium batteries. There are many researches on organic compounds in lithium battery cathode materials at home and abroad. There are many fruitful work, especially in the aspect of oxygen-containing organic conjugated compounds, some highly electrochemically active oxygen-containing functional groups and active The molecular structure design of organic compounds has important guidance and reference. Among them, there are many ways to solve the solubility and low conductivity of organic cathode materials in the electrolyte. As the organic compound molecule of the lithium ion cathode active material, in order to obtain excellent electrochemical performance, the following three factors must be considered: insoluble in the electrolyte; (3) having a certain conductivity. At present, the existing research has carried out many improvements on oxygen-containing organic compound anode materials, such as a large number of conductive agents, lithium/sodium salted carbonyl compounds, the polymerization process of carbonyl compounds, etc., and achieved certain results. However, there are still the following problems: (1) Adding conductive agents to improve solubility and conductivity to a certain extent reflects the performance of a greater degree of organic materials. On the other hand, conductive agents contribute to a part of the capacity, but will The addition of a large amount of conductive agent leads to the reduction of active materials, reduces the electrode capacity, and can lead to the increase of irreversible capacity; (2) Although the lithium salt treatment can reduce the solubility, it will introduce some non-electrochemically active Li+-o- functional groups , Resulting in a decrease in specific capacity. (3) Although the polymerization process can effectively reduce the solubility, components that are not chemically active will be introduced, such as accidentally repeating elements) and cause a reduction in specific capacity, and the charge repulsion between low-conductivity polymers and monomers The ion/electron transfer rate is slow, and the swelling property and aggregation structure of the polymer during the charge and discharge process will affect the diffusion rate of lithium ions. In order to solve these problems, at the same time, future research should build on the existing research, maximize the strengths and avoid weaknesses, and design some organic compounds with special functional structures, such as replacing the oxygen containing group conjugated macrocyclic conjugated structure system, which can realize lithium ion Nesting and embedding in the charging and discharging process replaces the activity level and achieves a higher theoretical specific capacity. On the one hand, the macrocyclic conjugated system can reduce the solubility of the lithium battery in the electrolyte, and further improve the discharge capacity and cycle stability of the lithium battery, on the other hand, it can also increase the conductivity. Green energy and sustainable energy are the future development direction. As the world attaches importance to the sustainable development of energy, organic batteries will attract more attention. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous article: Know the advantages and disadvantages of Ni-MH batteries in one article