法拉第效率
石墨
电解质
电化学
锂(药物)
材料科学
介电谱
电极
分析化学(期刊)
化学
物理化学
复合材料
色谱法
医学
内分泌学
作者
Connor Aiken,Eric Logan,Ahmed Eldesoky,Helena Hebecker,julian oxner,Jessie Harlow,Michael Metzger,J. R. Dahn
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2022-05-01
卷期号:169 (5): 050512-050512
被引量:33
标识
DOI:10.1149/1945-7111/ac67b5
摘要
Single crystal Li[Ni 0.5 Mn 0.3 Co 0.2 ]O 2 //graphite (NMC532) pouch cells with only sufficient graphite for operation to 3.80 V (rather than ≥4.2 V) were cycled with charging to either 3.65 V or 3.80 V to facilitate comparison with LiFePO 4 //graphite (LFP) pouch cells on the grounds of similar maximum charging potential and similar negative electrode utilization. The NMC532 cells, when constructed with only sufficient graphite to be charged to 3.80 V, have an energy density that exceeds that of the LFP cells and a cycle-life that greatly exceeds that of the LFP cells at 40 °C, 55 °C and 70 °C. Excellent lifetime at high temperature is demonstrated with electrolytes that contain lithium bis(fluorosulfonyl)imide (LiFSI) salt, well beyond those provided by conventional LiPF 6 electrolytes. Ultra-high precision coulometry and electrochemical impedance spectroscopy are used to complement cycling results and investigate the reasons for the improved performance of the NMC cells. NMC cells, particularly those balanced and charged to 3.8 V, show better coulombic efficiency, less capacity fade and higher energy density compared to LFP cells and are projected to yield lifetimes approaching a century at 25 °C.
科研通智能强力驱动
Strongly Powered by AbleSci AI