期刊
ACS APPLIED ENERGY MATERIALS
卷 4, 期 11, 页码 12709-12717出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.1c02422
关键词
lithium-ion battery; anode; water-soluble binder; ionic liquid; long cycle life; commercial LIBs; poly(vinylidene fl uoride) (PVDF) is
资金
- National Natural Science Foundation of China [52103059, 51773120, 51802201, 21803039]
- Guangdong Basic and Applied Basic Research Foundation [2019A1515110433, 2020A1515010326]
- Shenzhen Science and Technology Planning Project [JCYJ20190808123207674, JCYJ20190808115609663]
- funding program of Foshan supporting policies for promoting the service industry of scientific achievements in universities [2019XCC09]
- scientific Research Project of Guangdong Provincial Department of Education [2020ZDZX2040]
Ionic liquid-decorated copolymers were prepared as binders for Si/Gr anodes in lithium-ion batteries, showing higher rate capability and better cycle stability compared to traditional PVDF and PAA binders. The use of IL-decorated copolymers led to the quick formation of a well-structured SEI layer on the anodes, contributing to the excellent electrochemical performance.
Ionic liquid (IL)-decorated copolymers based on poly((ethylene lium hexafluorophosphate) were prepared and used as binders for Si/Gr anodes in lithium-ion batteries. The IL-decorated copolymer-bonded Si/Gr anodes showed a higher rate capability and better cycle stability than poly(vinylidene fluoride) (PVDF)-bonded and poly(acrylic acid) (PAA)-bonded Si/Gr anodes. In particular, the Si/Gr@CP1 anode exhibited an initial charge/discharge capacity of 1053/1286 mAh g-1 during the first formation cycle and retained 93.1% of its specific capacity after 100 cycles at a current density of 0.6 A g-1. Measurements from electrochemical impedance spectroscopy, scanning electron microscopy, and X-ray photoelectron spectroscopy demonstrated the quick formation of a well-structured solid-electrolyte interphase (SEI) layer on the IL-decorated copolymer-bonded Si/Gr anodes, which led to the excellent electrochemical performance of Si/Gr@CP1. The quick formation of this SEI layer was attributed to the introduction of IL into the polymer binder, which accumulated a large number of PF6- anions on the anode surface and facilitated SEI formation through in situ decomposition. The success of this work provides a promising avenue for pursuing high-capacity lithium-ion batteries (LIBs) with an extended cycle life.
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