期刊
ADVANCED FUNCTIONAL MATERIALS
卷 31, 期 47, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202104830
关键词
ion conductance; intrinsic microporosity; mechanical properties; poly(ethylene oxide) electrolytes; polymers; polysulfide shuttling
类别
资金
- National Key R&D Program of China [2020YFB07045000, 2016YFB0700600, 2016YFB0100300]
- Shenzhen Science and Technology Research Grant [JCYJ20200109140416788]
- Chemistry and Chemical Engineering Guangdong Laboratory [19220180]
- Faraday Institution [EP/S003053/1, FIRG014]
- EPSRC [EP/S003053/1] Funding Source: UKRI
By synthesizing a polymer of intrinsic microporosity (PIM) and forming a composite electrolyte (PEO-PIM), the performance of PEO can be greatly enhanced, including improved mechanical strength, hardness, and ionic conductivity, as well as reduced polysulfide shuttle effect, leading to improved rate performance, long-cycling stability, and excellent safety features for solid-state Li-S batteries.
Poly(ethylene oxide) (PEO) is a promising solid electrolyte material for solid-state lithium-sulfur (Li-S) batteries, but low intrinsic ionic conductivity, poor mechanical properties, and failure to hinder the polysulfide shuttle effect limits its application. Herein, a polymer of intrinsic microporosity (PIM) is synthesized and applied as an organic framework to comprehensively enhance the performance of PEO by forming a composite electrolyte (PEO-PIM). The unique structure of PIM-1 not only enhances the mechanical strength and hardness over the PEO electrolyte by an order of magnitude, increasing stability toward the metallic lithium anode but also increases its ionic conductivity by lowering the degree of crystallinity. Furthermore, the PIM-1 is shown to effectively trap lithium polysulfide species to mitigate against the detrimental polysulfide shuttle effect, as electrophilic 1,4-dicyanooxanthrene functional groups possess higher binding energy to polysulfides. Benefiting from these properties, the use of PEO-PIM composite electrolyte has achieved greatly improved rate performance, long-cycling stability, and excellent safety features for solid-state Li-S batteries. This methodology offers a new direction for the optimization of solid polymer electrolytes.
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