Kaboli Shirin, Demers Hendrix, Paolella Andrea, Darwiche Ali, Dontigny Martin, Clément Daniel, Guerfi Abdelbast, Trudeau Michel L, Goodenough John B, Zaghib Karim
Hydro-Québec's Center of Excellence in Transportation Electrification and Energy Storage, Varennes, Québec J3X 1S1, Canada.
University of Texas at Austin, 202 Spence Street, College Station, Texas 77840, United States.
Nano Lett. 2020 Mar 11;20(3):1607-1613. doi: 10.1021/acs.nanolett.9b04452. Epub 2020 Feb 7.
We present the first results of in situ scanning electron microscopy (SEM) of an all-solid Li battery with a nickel-manganese-cobalt-oxide (NMC-622) cathode at 50 °C and an operating voltage of 2.7-4.3 V. Experiments were conducted under a constant current at several C rates (C rate: cycling in 1/ h): C/12, C/6, and C/3. The microstructure evolution during cycling was monitored by continuous secondary electron imaging. We found that the chemical degradation of the solid polymer electrolyte (SPE) was the main mechanism for battery failure. This degradation was observed in the form of a gradual thinning of the SPE as a function of cycling time, resulting in gas generation from the cell. We also present various dynamic electrochemical and mechanical phenomena, as observed by SEM images, and compare the performance of this battery with that of an all-solid Li battery with a LiFePO cathode.
我们展示了在50°C和2.7 - 4.3 V工作电压下，对具有镍锰钴氧化物（NMC - 622）阴极的全固态锂电池进行原位扫描电子显微镜（SEM）观察的首批结果。实验在几个C倍率（C倍率：以1 / h进行循环）下恒流进行：C/12、C/6和C/3。通过连续二次电子成像监测循环过程中的微观结构演变。我们发现，固态聚合物电解质（SPE）的化学降解是电池失效的主要机制。这种降解表现为SPE随着循环时间逐渐变薄，导致电池产生气体。我们还展示了通过SEM图像观察到的各种动态电化学和力学现象，并将该电池的性能与具有磷酸铁锂阴极的全固态锂电池的性能进行了比较。
