锂离子电池石墨负极材料衰减机理研究

石墨负极材料因具有比容量高、价格低廉以及环境友好等特性在锂电池领域得到广泛的应用.但材料在循环过程中也显露出缺陷,如在循环过程中体积不断变化导致微裂纹、石墨化度降低、接触损失、SEI膜变化、金属锂析出、不均匀性等缺点导致其在锂电池的循环中容量衰减.本文对负极材料循环过程中容量衰减有关机理进行总结,并提出各种衰减机理的简...

Research on the Degradation Mechanism of Negative Materials for Lithium-Ion Battery

Graphite anode materials have been widely used in the field of lithium batteries because of their high specific capacity, low price and environmental friendliness. However, the material also exhibits some defects during the charge-discharge process, such as microcracks, graphitization degree reduction, contact loss, solid electrolyte interphase film change, lithium metal precipitation, inhomogeneity and other defects, which cause the capacity degradation of lithium-ion battery. In this paper, the mechanism of capacity decay in the cycle of anode materials was summarized, and the solutions of various degradation mechanisms were given briefly.