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Dual-Functional Gel-Polymer Electrolyte for Lithium Ion Batteries with Superior Rate and Safety Performances

Abstract

The ability to judiciously utilize gel-polymer electrolyte (GPE) that replaces liquid electrolyte is widely recognized as an attractive route to solving 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, excellent electrochemical and safety performances are developed via in-situ polymerization of the pentaerythritol tetraacrylate (PETEA) in liquid electrolyte. Notably, the capacity retention of NCA/graphite and NCA/graphite-Si/C GPE batteries after 200 cycles at the discharge rate of 5 C are 95.5% and 81.2%, respectively, which are much larger than those implementing liquid electrolytes (i.e., only 55.9% and 51.4%, respectively). Interestingly, GPE batteries also displayed considerably lower gas production, especially for 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 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 electrode during the cycling process and reduced the heat reactions between electrodes and electrolyte.

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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, Accepted Manuscript
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    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, B. Li, Q. Yang, F. Kang and Z. Lin, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA04415A

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