Taiwo O O, Finegan D P, Paz-Garcia J M, Eastwood D S, Bodey A J, Rau C, Hall S A, Brett D J L, Lee P D, Shearing P R
Electrochemical Innovation Lab, Department of Chemical Engineering, University College London, Torrington Place, London WC1E 7JE, UK.
Phys Chem Chem Phys. 2017 Aug 23;19(33):22111-22120. doi: 10.1039/c7cp02872e.
The growth of electrodeposited lithium microstructures on metallic lithium electrodes has prevented their use in rechargeable lithium batteries due to early performance degradation and safety implications. Understanding the evolution of lithium microstructures during battery operation is crucial for the development of an effective and safe rechargeable lithium-metal battery. This study employs both synchrotron and laboratory X-ray computed tomography to investigate the morphological evolution of the surface of metallic lithium electrodes during a single cell discharge and over numerous cycles, respectively. The formation of surface pits and the growth of mossy lithium deposits through the separator layer are characterised in three-dimensions. This has provided insight into the microstructural evolution of lithium-metal electrodes during rechargeable battery operation, and further understanding of the importance of separator architecture in mitigating lithium dendrite growth.
金属锂电极上电沉积锂微结构的生长，由于早期性能退化和安全隐患，阻碍了它们在可充电锂电池中的应用。了解电池运行过程中锂微结构的演变，对于开发高效且安全的可充电锂金属电池至关重要。本研究分别利用同步加速器和实验室X射线计算机断层扫描技术，来研究金属锂电极表面在单电池放电过程中以及多个循环中的形态演变。通过三维方式对表面凹坑的形成以及苔藓状锂沉积物穿过隔膜层的生长进行了表征。这为可充电电池运行期间锂金属电极的微观结构演变提供了见解，并进一步理解了隔膜结构在减轻锂枝晶生长方面的重要性。
