Does the choice of positive and negative materials for lithium batteries affect safety?

The choice of lithium battery cathode material is based on the following factors: 1) It has a higher oxidation-reduction reaction potential, so that the lithium battery can reach a higher output voltage; 2) The lithium element content is high, and the material packing density is high, which makes the lithium battery have Higher energy density; 3) The structural stability during the chemical reaction process should be good, so that the lithium battery has a long cycle life; 4) The electrical conductivity should be high, so that the lithium battery has good charge and discharge rate performance; 5) Chemical stability and The thermal stability is good, and it is not easy to analyze and generate heat, so that the lithium battery has good safety; 6) the price is cheap, making the cost of the lithium battery low enough; 7) the manufacturing process is relatively simple, which is convenient for large-scale processing; 8) pollution to the environment Low and easy to recycle. Some key indicators such as the energy density, charge-discharge rate, and safety of lithium batteries are tightly controlled by the positive electrode material. Among the cathode materials, the most commonly used materials are lithium cobaltate, lithium manganate, lithium iron phosphate and ternary materials. The cathode material has always been the core of lithium batteries, and its choice directly determines the level of battery performance. The choice of positive electrode material is important, the reversible lithium removal and lithium intercalation transition metal oxide is one of the important components of lithium batteries. The selection of anode materials for lithium batteries should consider the following conditions: 1) It should be layered or tunnel structure to facilitate the deintercalation of lithium ions; 2) There is no structural change during the deintercalation of lithium ions, and it has good charge and discharge. Reversibility and cycle life; 3) Lithium ions should be inserted and extracted as much as possible in order to make the electrode have a higher reversible capacity; 4) The potential of the redox reaction should be low, and the positive electrode material should be matched to make the lithium battery have Higher output voltage; 5) The first irreversible discharge has a smaller specific capacity; 6) Good compatibility with electrolyte solvents; 7) Abundant resources and low price; 8) Good safety; 9) Environmentally friendly. Important anode materials for lithium batteries include tin-based materials, lithium-based materials, lithium titanate, carbon nanomaterials, and graphene materials. The negative electrode material is the main body of the lithium battery to store lithium, allowing the insertion and extraction of lithium ions during the charging and discharging process. The negative electrode is the electrode that flows out electrons when the battery is discharged. The negative electrode material greatly affects the first efficiency and cycle performance of the lithium battery. The performance of the negative electrode material also directly affects the performance of the lithium battery. The negative electrode material accounts for about 5-15% of the total cost of the lithium battery. In summary, in recent years, the research, development and application of positive and negative active materials in lithium batteries have been very active in the world, and great progress has been made. The crystal structure of the material is regular, and the structure does not change irreversibly during the charging and discharging process, which is the key to obtaining a lithium battery with high specific capacity and long cycle life. 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 post: What are the types of lithium batteries