A dual-functional gel-polymer electrolyte for lithium ion batteries with superior rate and safety performances

Xilin Li, Kun Qian, Yan Bing He, Cheng Liu, Decheng An, Yiyang Li, Dong Zhou, Zhiqun Lin, Baohua Li, Quan Hong Yang, Feiyu Kang

Research output: Contribution to journalArticlepeer-review

82 Scopus citations

Abstract

The ability to judiciously utilize gel-polymer electrolytes (GPEs) that replace liquid electrolytes is widely recognized as an attractive route to solving the safety concerns of Li-ion batteries (LIBs). In this context, novel LiNi0.8Co0.15Al0.05O2 (NCA)/graphite GPE and NCA/graphite-Si/C GPE batteries with high energy density and excellent electrochemical and safety performances are developed via in situ polymerization of pentaerythritol tetraacrylate (PETEA) in a liquid electrolyte. Notably, the capacity retention of NCA/graphite and NCA/graphite-Si/C GPE batteries after 200 cycles at the discharge rate of 5C is 92.5% and 81.2%, respectively, which are much larger than those implementing liquid electrolytes (i.e., only 55.9% and 51.4%, respectively). Interestingly, the GPE batteries also displayed considerably lower gas production, especially the graphite-Si/C anode battery, and did not undergo a violent combustion during the nail penetration test compared to the liquid electrolyte batteries. The markedly enhanced performances noted above can be attributed to the three-dimensional framework of the GPE which promoted the formation of a very tight protective film on the surface of the electrodes during cycling, thereby inhibiting the cyclable Li consumption and side reactions with the electrolyte. Furthermore, such a protective film effectively retained the structural integrity of the electrodes during the cycling process and reduced the heat reactions between the electrodes and electrolyte.

Original languageEnglish
Pages (from-to)18888-18895
Number of pages8
JournalJournal of Materials Chemistry A
Volume5
Issue number35
DOIs
StatePublished - 2017

Bibliographical note

Publisher Copyright:
© 2017 The Royal Society of Chemistry.

Fingerprint

Dive into the research topics of 'A dual-functional gel-polymer electrolyte for lithium ion batteries with superior rate and safety performances'. Together they form a unique fingerprint.

Cite this