In situ formed polymer gel electrolytes for lithium batteries with inherent thermal shutdown safety features

文献情報

出版日 2019-06-25

DOI 10.1039/C9TA02341K

インパクトファクター 12.732

著者

Hongyao Zhou, Haodong Liu, Yejing Li, Xiujun Yue, Xuefeng Wang, Matthew Gonzalez, Ying Shirley Meng, Ping Liu

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要旨

Rechargeable lithium metal batteries based on organic electrolytes face challenges of both lithium metal cycling stability and the associated safety issues. Herein, we demonstrate an in situ formed polymer gel electrolyte which enables dendrite-free lithium metal cycling. Moreover, the gel electrolyte goes through further polymerization at elevated temperatures and loses its ionic conductivity, effectively shutting down the battery. When lithium iodide (LiI) is dissolved in vinylene carbonate (VC), LiI induces the polymerization of VC to form poly(vinylene carbonate) (polyVC). The electrolyte then transforms into a polymer gel electrolyte containing VC as the solvent and LiI as the salt. At room temperature, the gel electrolyte enables dendrite-free lithium metal cycling at current densities as high as 5 mA cm−2 for 500 cycles. Furthermore, a Li/Li4Ti5O12 (LTO) cell retains 50% of the initial capacity at the 700th cycle. When the cell is heated to 80 °C, the ionic resistance of the electrolyte increases by a factor of 103, resulting in the shutdown of the cell due to the complete polymerization of VC. The approach of using in situ polymerization to enable stable lithium cycling and to serve as a thermally triggered shutdown mechanism provides a new pathway for fabricating safer lithium metal batteries.

掲載誌

Journal of Materials Chemistry A

CiteScore: 19.5

自己引用率: 4.7%

年間論文数: 2211

Journal of Materials Chemistry A, B & C cover high quality studies across all fields of materials chemistry. The journals focus on those theoretical or experimental studies that report new understanding, applications, properties and synthesis of materials. The journals have a strong history of publishing quality reports of interest to interdisciplinary communities and providing an efficient and rigorous service through peer review and publication. The journals are led by an international team of Editors-in-Chief and Associate Editors who are all active researchers in their fields. Journal of Materials Chemistry A, B & C are separated by the intended application of the material studied. Broadly, applications in energy and sustainability are of interest to Journal of Materials Chemistry A, applications in biology and medicine are of interest to Journal of Materials Chemistry B, and applications in optical, magnetic and electronic devices are of interest to Journal of Materials Chemistry C. More than one Journal of Materials Chemistry journal may be suitable for certain fields and researchers are encouraged to submit their paper to the journal that they feel best fits for their particular article. Example topic areas within the scope of Journal of Materials Chemistry A are listed below. This list is neither exhaustive nor exclusive. Artificial photosynthesis Batteries Carbon dioxide conversion Catalysis Fuel cells Gas capture/separation/storage Green/sustainable materials Hydrogen generation Hydrogen storage Photocatalysis Photovoltaics Self-cleaning materials Self-healing materials Sensors Supercapacitors Thermoelectrics Water splitting Water treatment

In situ formed polymer gel electrolytes for lithium batteries with inherent thermal shutdown safety features

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Journal of Materials Chemistry A

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