We report a mechano-chemical model for anodic degradation during fast-charging of nickel-manganese-cobalt (NMC)/graphite (C) cell due to SEI growth, lithium plating/stripping, dead lithium storage, and film fracture of composite SEI and plated lithium film. Degradation of the battery is analyzed for a range of charging rates from 1 to 6 C-rates, and the influence of plating mechanisms – lithium plating and dead lithium deposition and recovery during stripping – on the film resistance of the anode are accounted for in the model. Dynamic evolution of the interfacial properties is modeled using rule-of-mixture approach. Model predictions of plating associated stress fields are used to compute critical energy release rate for film cracking. The results indicate an increased tendency of fracture for thinner SEI film with lithium plating at higher charging rates. The process of reforming the cracked film absorbs a significant portion of the electrode current thereby reducing the cell capacity and plating efficiency. The mechano-chemical model provides an extensive analytical framework for understanding the synergistic coupling of anodic degradation mechanisms, prognosticating conditions of SEI failure, and evaluating the capacity fade and efficiency of lithium-ion battery.

我们报告了由于SEI增长，锂电镀/剥离，死锂存储和复合SEI的膜破裂而导致的镍锰钴（NMC）/石墨（C）电池快速充电过程中阳极降解的力学化学模型。镀锂膜。分析了电池在1至6 C充电速率范围内的降解情况，并考虑了电镀机理-锂电镀以及剥离过程中死锂的沉积和回收-对阳极膜电阻的影响。模型。界面特性的动态演变是使用混合规则方法进行建模的。电镀相关应力场的模型预测用于计算薄膜破裂的临界能量释放速率。结果表明，在较高的充电速率下，使用锂电镀的SEI薄膜越薄，断裂的趋势越大。重整裂纹膜的过程吸收了很大一部分电极电流，从而降低了电池容量和电镀效率。机械化学模型为理解阳极降解机制的协同耦合，预测SEI失效的条件以及评估锂离子电池的容量衰减和效率提供了广泛的分析框架。