Rikka Vallabha Rao, Sahu Sumit Ranjan, Chatterjee Abhijit, Prakash Raju, Sundararajan G, Gopalan R
Centre for Automotive Energy Materials, International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Chennai 600113, Tamil Nadu, India.
Department of Chemical Engineering, Indian Institute of Technology Bombay, Powai 400076, Maharashtra, India.
iScience. 2022 Aug 2;25(9):104831. doi: 10.1016/j.isci.2022.104831. eCollection 2022 Sep 16.
Range anxiety is a primary concern among present-day electric vehicle (EV) owners, which could be curtailed by maximizing the driving range per charge or reducing the charging time of the lithium-ion battery (LIB) pack. Maximizing the driving range is a multifaceted task as charging-discharging the LIB up to 100% of its nominal capacity is limited by the cell chemistry (voltage window) and cell operating conditions. Our studies on commercial LiFePO/graphite cells show that a cycle life of 4320 is achieved at 4C rate with 80% SOC-100% DOD combination (12 min charging time), which is the highest among the works reported with this cell chemistry. Complete utilization of electrodes' lithium during cycling resulted in the lowest cycle life of 956. This study demonstrates LIB charging-discharging protocol enabling longer driving range with quicker charging times. Besides, it might endow promising possibilities of future EV LIB packs with reduced size/weight and high safety.
续航焦虑是当今电动汽车车主的主要担忧，这可以通过最大化每次充电的行驶里程或缩短锂离子电池组的充电时间来缓解。最大化行驶里程是一项多方面的任务，因为将锂离子电池充电至其标称容量的100%受到电池化学性质（电压窗口）和电池工作条件的限制。我们对商用磷酸铁锂/石墨电池的研究表明，在4C倍率、80%的荷电状态-100%的放电深度组合（充电时间12分钟）下可实现4320次循环寿命，这是该电池化学性质相关报道中最高的。循环过程中电极锂的完全利用导致最低循环寿命为956次。本研究展示了一种锂离子电池充放电方案，可实现更长的行驶里程和更快的充电时间。此外，它可能为未来尺寸更小/重量更轻且安全性高的电动汽车锂离子电池组带来有前景的可能性。
