| 摘要 |
A lithium ion battery with a long cycle performance. The present invention relates to the field of batteries. A material system of the lithium ion battery takes lithium iron phosphate with a stable cycle performance as a cathode, lithium titanate with an excellent cycle performance as an anode and graphene with a high conductivity performance as a conductive additive. A cathode and anode material system with the excellent cycle performance is adopted, the areal density and compaction density of a cathode pole piece and an anode pole piece are optimized and controlled, and the cycle performance of the battery is greatly improved. The graphene with the high conductivity performance is adopted as a conductive agent additive, such that the defect of reduction of an active material proportion of a cathode to an anode due to the fact that a large number of conventional conductive agents need to be added when they are adopted is avoided, and the volume energy density of the battery is further improved. An electrolyte containing a PC solvent is adopted, and the high freezing point and high conductivity of the PC solvent are utilized, such that the problem of battery heat dissipation under the large current charge-discharge conditions is effectively buffered, and the cycle stability of the battery is further guaranteed. A preparation process for the lithium ion battery is simple, and a manufactured lithium battery is excellent in performance. |
