Clarification of the basic requirements of lithium-ion battery cathode materials

First, the material itself has a high potential, so that a large potential difference is formed between the talent and the negative electrode material, resulting in a battery design with high energy density; at the same time, the insertion and extraction of charged ions has little effect on the electrode potential, and the charge and discharge process will not Excessive voltage bumps will not bring unlucky effects to other electrical systems in the system. Second, the material contains high lithium content and the intercalation and deintercalation of lithium ions is reversible. This is a prerequisite for high capacity. Some positive electrode materials have a high theoretical capacity, but half of the lithium ions lose their activity after the first insertion. Such materials cannot be put into commercial use. Third, the diffusion coefficient of lithium ions is large, the movement of lithium ions inside the material is faster, and the ability of insertion and extraction is strong. It is a factor that affects the internal resistance of the cell and also a factor that affects the power characteristics. Fourth, the material has a larger volume than the appearance, and there are a lot of lithium insertion sites. The appearance volume is large, and the insertion channel of the lithium-ion battery is relatively short, so it is easier to embed and release. While the channel is shallow, the position of lithium insertion is also rich. Fifth, the compatibility and thermal stability of the electrolyte with lithium-ion batteries are good, which is out of consideration for safety. The positive electrode material and the electrolyte are not easy to reverberate, and the layout remains unchanged at higher temperatures and it is still not easy to reverberate with the electrolyte. Such a material will not provide heat for the extra heat accumulation of the battery cell, and can eliminate the probability of the battery cell entering the self-heating stage. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete it.