材料科学
电化学
泄流深度
离子
动能
热的
石墨
扩散
锂(药物)
电池(电)
航程(航空)
化学
电解质
分析化学(期刊)
热力学
电极
复合材料
功率(物理)
有机化学
量子力学
物理化学
内分泌学
物理
医学
色谱法
作者
Yan Ji,Yancheng Zhang,Chao Yang Wang
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2013-01-01
卷期号:160 (4): A636-A649
被引量:409
摘要
Substantially reduced energy and power capabilities of lithium-ion cell operating at low temperatures pose a technical barrier for market penetration of hybrid electric vehicles and pure electric vehicles. The present work delineates Li-ion cell behaviors at low temperatures by a combined experimental and modeling approach. An electrochemical-thermal coupled model, incorporating concentration- and temperature-dependent transport and kinetic properties, is applied and validated against 2.2Ah 18650 cylindrical cells over a wide range of temperatures (−20°C to 45°C) and discharge rates. Simulation and experimental results demonstrate the dramatic effects of cell self-heating upon electrochemical performance. A nonisothermal Ragone plot accounting for these important thermal effects is proposed for the first time for Li-ion cells and more generally for thermally coupled batteries. Detailed resistance analysis indicates that performance limits at −20°C depend on not only discharge rates but also thermal conditions. Optimization of cell design parameters and material properties is performed for 1 C rate discharge starting from −20°C, where the principal performance limitations are found to be Li+ diffusion in the electrolyte and solid-state Li diffusion in graphite particles, instead of charge-transfer kinetic or ohmic resistance.
科研通智能强力驱动
Strongly Powered by AbleSci AI