Polyethylene terephthalate-based cathode current collectors coated by ultrathin aluminum metal layers for commercial lithium-ion batteries with high security and long-term cycling stability

Wangbing Yao, Zhuoyuan Zheng, Guoqiang Zhong, Youqin Lin, Dongming Liu, Jinbao Song, Yusong Zhu

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

With the rapidly increasing market demand of lithium-ion batteries (LIBs), safety has become the main focus and challenge in realizing high-energy and high-safety LIBs. In this paper, a light-weight composite current collector, which is prepared by sandwiching a polyethylene terephthalate (PET) film between two ultrathin aluminum (Al) layers, is designed to improve the safety performances of the LIBs. The PET film is selected as the supporting film due to its low density, superior mechanical properties, excellent thermal stability, and remarkable flame resistance. The thermal and mechanical stabilities of the PET-Al based electrode systems, as well as the electrochemical performances of the corresponding LIBs, are evaluated. Nail penetration test further is carried out to investigate the internal short-circuit behaviors of the batteries, which is the most extreme and hazardous condition and may cause thermal runaway and catastrophic accidents. The results well demonstrate that the proposed PET-Al current collector can slow down the temperature rise of the entire battery during the nail penetration, and effectively achieve the aim of improving the reliability performances of LIBs.

Original languageEnglish
Article number168937
JournalJournal of Alloys and Compounds
Volume941
DOIs
StatePublished - 25 Apr 2023

Keywords

  • Aluminum-plastic film
  • Commercial lithium-ion batteries
  • Current collector
  • High security and reliability
  • Polyethylene terephthalate

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