What determines the safety of lithium battery cathode materials?

What determines the safety of cathode materials for lithium batteries? The safety, energy density and power density of cathode materials are the basic basis for choosing different models of lithium batteries. The negative electrode material determines the energy density, life and safety of lithium batteries, accounting for about 30% of the cost of lithium batteries. Lithium cathode material. What does JPG determine the safety of lithium battery cathode materials? In ordinary cathode materials, the content of lithium ions is greater than the ion capacity of the anode materials, thereby improving the power characteristics and cycling of lithium batteries. The higher the temperature of material thermal stability, the material with weaker oxidizing ability, the safer information to ensure that the cathode material does not react with the electrolyte depends on the thermal stability of the cathode material itself and the compatibility of the electrolyte. ◆Cell energy density Each lithium battery cathode material has its theoretical energy density. If you choose the cathode material, you have chosen the upper limit of the energy density of the battery. In the process of designing and manufacturing the cathode material, the energy density of the battery is also affected by the amount of cathode material. ◆The cathode materials with different battery power densities determine the general range of lithium battery charge and discharge power. Some details of the material as an auxiliary factor will also affect the power characteristics. Such as the stability of the crystal structure of the cathode material, particle size, doping atoms, carbon coating technology, material preparation methods, etc. The above factors ultimately affect the power density of the lithium battery, the ability of the cathode material to accommodate lithium ions and the unblocking of the embedding channel. ◆Battery life There are many factors that affect the cycle life of a lithium battery. This is related to the positive electrode material. It is important to include the loss of active material in the recycling of the positive electrode material, and the capacity attenuation of the material structure caused by the lithium ion of the positive electrode during charging and discharging. In the process. Impurities in the cathode material, such as elemental iron and ferric iron, interact with the electrolyte and cause unfavorable side-uses or cause internal micro short circuits. The basic requirements of lithium battery cathode materials First of all, the material itself has a high potential, which forms a large potential difference with the cathode material, resulting in a core design with high energy density; at the same time, the insertion and separation of charged ions has little effect on the electrode potential. Therefore, there will not be too much voltage fluctuation during the charging and discharging process, and will not cause adverse effects on other electrical systems. Second, the material contains high lithium content, and the intercalation of lithium ions is reversible. This is a prerequisite for high capacity. Some negative electrode materials have a high theoretical capacity, but half of the lithium ions, they lose activity after the first insertion. This material is not commercially viable. Third, the diffusion coefficient of lithium ions is large, the movement speed of lithium ions in the material is fast, and it has strong embedding and de-embedding capabilities. It is a factor that affects the internal resistance and power characteristics of the battery. Fourth, the material has a large specific surface area and many places for lithium insertion. Since lithium ions have a larger surface area and a shorter embedding channel, it is easier to embed and de-embed. At the same time, the groove is shallow, and the lithium insertion position should be sufficient. Fifth, it has good compatibility with electrolyte, good thermal stability, safety and reliability. The positive electrode material of lithium battery is not easy to react with electrolyte, the structure is stable at higher temperature, and it is still not easy to react with electrolyte. Such materials will not provide additional heat accumulation for the battery, and can reduce the probability of the battery entering the heating phase. Sixth, the materials are easy to obtain and the production performance is good. Low cost, easy production into electrodes, and stable electrode structure are favorable conditions for the popularization and application of materials. The price trend of lithium battery cathode materials When it comes to the price of lithium battery cathode materials, the first thing we think of is the price of lithium batteries. In fact, the price of lithium-ion cathode materials is an important part of lithium batteries. According to calculations, the price of lithium battery cathode materials accounts for about 25% to 35%. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. 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