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Issue 35, 2017
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A dual-functional gel-polymer electrolyte for lithium ion batteries with superior rate and safety performances

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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.

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

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Publication details

The article was received on 22 May 2017, accepted on 11 Aug 2017 and first published on 11 Aug 2017


Article type: Paper
DOI: 10.1039/C7TA04415A
Citation: J. Mater. Chem. A, 2017,5, 18888-18895
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    A dual-functional gel-polymer electrolyte for lithium ion batteries with superior rate and safety performances

    X. Li, K. Qian, Y. He, C. Liu, D. An, Y. Li, D. Zhou, Z. Lin, B. Li, Q. Yang and F. Kang, J. Mater. Chem. A, 2017, 5, 18888
    DOI: 10.1039/C7TA04415A

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