A composite surface configuration towards improving cycling stability of Li-rich layered oxide materials

Shi, Zhepu; Gu, Qingwen; Yun, Liang; Wei, Zhining; Hu, Di; Qiu, Bao; Chen, George Zheng; Liu, Zhaoping

Abstract

Li-rich layered oxides are promising positive electrode candidates for next-generation high-energy Li-ion batteries. However, they suffer from a severe gas release issue and side reaction-induced surface degradation resulting in significant capacity fade and voltage decay. Herein, this work proposes a composite surface configuration by coordinating the three different structures from Nb/Al surface doping, surface oxygen vacancies and Al2O3layerviasolution coating. A comprehensive characterization provided persuasive evidence that the composite surface configuration not only mitigates oxygen release but also regulates Li+ion extraction/insertion during cycling. Due to the reduced side reaction and promoted surface stability, a decent specific discharge capacity of about 270 mA h g−1at 0.1C between 2.0 and 4.6 Vvs.Li+/Li was achieved with 57.0% capacity preservation after 1000 cycles at 1C. Most importantly, a 20 A h pouch cell fabricated with this surface-modified positive electrode and an SGC/Gr-negative electrode delivered 345 W h kg−1in specific energy and retained 77.9% of it at 0.2C after 340 cycles.

Citation

Shi, Z., Gu, Q., Yun, L., Wei, Z., Hu, D., Qiu, B., Chen, G. Z., & Liu, Z. (2021). A composite surface configuration towards improving cycling stability of Li-rich layered oxide materials. Journal of Materials Chemistry A, 9(43), 24426-24437. https://doi.org/10.1039/d1ta06971c

• Journal Article Type: Article
• Acceptance Date: Oct 11, 2021
• Online Publication Date: Oct 12, 2021
• Publication Date: Nov 21, 2021
• Deposit Date: Oct 22, 2021
• Publicly Available Date: Oct 13, 2022
• Journal: Journal of Materials Chemistry A
• Print ISSN: 2050-7488
• Electronic ISSN: 2050-7496
• Publisher: Royal Society of Chemistry
• Peer Reviewed: Peer Reviewed
• Volume: 9
• Issue: 43
• Pages: 24426-24437
• DOI: https://doi.org/10.1039/d1ta06971c
• Keywords: General Materials Science; Renewable Energy, Sustainability and the Environment; General Chemistry
• Public URL: https://nottingham-repository.worktribe.com/output/6508960
• Publisher URL: https://pubs.rsc.org/en/Content/ArticleLanding/2021/TA/D1TA06971C