Operando study of mechanical integrity of high-volume expansion Li-ion battery anode materials coated by Al2O3. (4th June 2023)

• Record Type: Journal Article
• Authors: Zhou, Xinwei; Stan, Liliana; Hou, Dewen; Jin, Yang; Xiong, Hui; Zhu, Likun; Liu, Yuzi
• Is Part Of: Nanotechnology. Volume 34:Number 23(2023)
• Publication Date: 2023-06-04
• Subjects: operando -- coating -- Li-ion battery; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/1361-6528/acbeb1
• Languages: English
• ISSNs: 0957-4484

Abstract

Abstract: Group IV elements and their oxides, such as Si, Ge, Sn and SiO have much higher theoretical capacity than commercial graphite anode. However, these materials undergo large volume change during cycling, resulting in severe structural degradation and capacity fading. Al2 O3 coating is considered an approach to improve the mechanical stability of high-capacity anode materials. To understand the effect of Al2 O3 coating directly, we monitored the morphology change of coated/uncoated Sn particles during cycling using operando focused ion beam–scanning electron microscopy. The results indicate that the Al2 O3 coating provides local protection and reduces crack formation at the early stage of volume expansion. The 3 nm Al2 O3 coating layer provides better protection than the 10 and 30 nm coating layer. Nevertheless, the Al2 O3 coating is unable to prevent the pulverization at the later stage of cycling because of large volume expansion.