What are the factors that affect the cycle life of lithium batteries

The choice of materials is the first element that affects the performance of lithium batteries. The cycle performance of the material is poor. On the one hand, it may be that the crystal structure changes too fast during the cycle to continuously complete the lithium insertion and removal. On the other hand, it may be that the active material and the corresponding electrolyte cannot form a dense and average SEI film, which causes the active material. Premature side reactions with the electrolyte will cause the electrolyte to be consumed too quickly and affect the circulation. 2. Positive and negative electrode compaction The positive and negative electrode compaction is too high, although it can increase the energy density of the lithium battery, but it will also reduce the cycle performance of the material to a certain extent. Decomposing theoretically, the greater the compaction, the greater the damage to the structure of the material. 3. Excessive moisture will cause side reactions between the lithium battery and the positive and negative active materials, destroy its structure and affect the cycle. At the same time, excessive moisture is not conducive to the formation of SEI film. 4. Coating film density. The inconsistency of film density will either bring about a difference in capacity, or a difference in the number of battery core windings or laminated layers. For lithium batteries of the same model, capacity, and material, reducing the film density is equivalent to adding one or more layers of winding or lamination. The new diaphragm can absorb more electrolyte to ensure circulation. ⒌Excessive negative electrode If the negative electrode is excessively excessive, the lithium battery may not release lithium before cycling, but the structure of the positive electrode changes little after hundreds of cycles, but the structure of the negative electrode is severely damaged and cannot completely receive the lithium ions supplied by the positive electrode to precipitate lithium. Cause the capacity to drop prematurely. 6. Electrolyte amount Insufficient amount of electrolyte has three main reasons that affect the cycle life of lithium batteries. One is insufficient injection volume, and the other is that although the injection volume is sufficient, the aging time is not enough, or the positive and negative electrodes are over compacted. The immersion liquid is not sufficient, and the third is that the internal electrolyte of the circulating cell is consumed. 7. Use environment Although the use environment of lithium batteries is very wide, there are still requirements. Lithium batteries are extremely sensitive to temperature. If they are used for a long time below freezing, they may have a great impact and harm on battery life. Long-term exposure to an overheated environment will greatly reduce the life of the battery. In severe cases, the internal pressure will increase and cause an explosion. Even if there is no explosion, the battery will be quickly scrapped in high heat. 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 advantages of lithium battery dust removal devices