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

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

Research output: Journal PublicationArticlepeer-review

3 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)24426-24437
Number of pages12
JournalJournal of Materials Chemistry A
Volume9
Issue number43
DOIs
Publication statusPublished - 21 Nov 2021

ASJC Scopus subject areas

  • Chemistry (all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science (all)

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