Why does the capacity of the ternary material lithium battery decline?

Reasons for the capacity decline of ternary lithium batteries ●Structural changes of ternary lithium battery cathode materials. The cathode material is an important source of lithium ions. When lithium ions are extracted from the cathode, in order to maintain the neutral state of the material, the metal elements will inevitably be Oxidation reaches a high oxidation state, which is accompanied by a change in composition. The transformation of components easily leads to phase transition and changes in bulk structure. The phase transition of the electrode material can cause the change of the lattice parameters and the lattice mismatch. The induced stress caused by this causes the breakage of the crystal grains, and initiates the propagation of cracks, causing mechanical damage to the structure of the material, thereby causing degradation of electrochemical performance. ●Ternary lithium battery anode material structure Commonly used anode materials for commercial lithium batteries include carbon materials, lithium titanate, etc. This article uses typical anode graphite for analysis. The decay of the lithium battery capacity occurs for the first time in the formation stage, during this stage SEI will be formed on the surface of the negative electrode, consuming part of the lithium ions. ●The oxidative decomposition and interface reaction of the electrolyte. The nature of the electrolyte significantly affects the specific capacity, life, rate charge and discharge performance, operating temperature range and safety performance of lithium batteries. The electrolyte mainly includes three parts: solvent, electrolyte and additives. The decomposition of the solvent and the decomposition of the electrolyte will cause the loss of battery capacity. The decomposition and side reactions of the electrolyte are important factors for the capacity degradation of lithium batteries. Regardless of the positive and negative electrode materials and processes used, as the lithium battery is recycled, the decomposition of the electrolyte and the interface between the positive and negative materials will occur. Reactions will cause capacity attenuation. 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: What are the differences between lithium iron phosphate battery pack and ternary lithium battery?