Journal
ADVANCED ENERGY MATERIALS
Volume 12, Issue 42, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202200967
Keywords
2D fluorinated graphene; grain refinement effects; polymer electrolytes; solid-state lithium batteries; stable electrode; electrolyte interfaces
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Funding
- National Natural Science Foundation of China [U1932205, 22171016, 51872012]
- Key R&D Program of Shandong Province [2021CXGC010401]
- Taishan Scholars Program [ts201712035]
- Project of Qingdao Leading Talents in Entrepreneurship and Innovation
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This paper reports the design of 2D fluorinated graphene-reinforced PVDF-HFP-LiTFSI polymer electrolytes for improving the mechanical properties and electrode/electrolyte interfacial reaction in solid-state lithium batteries. The use of this polymer electrolyte enables long-term Li plating/stripping and stable cycling, promoting the applications of solid polymer electrolytes in high-performance solid-state lithium batteries.
Solid polymer electrolytes (SPEs) hold a great promise in the application of solid-state lithium batteries, but suffer from poor mechanical properties and uncontrolled electrode/electrolyte interfacial reaction, which restrict their overall electrochemical performance. Herein, the design of 2D fluorinated graphene-reinforced PVDF-HFP-LiTFSI (FPH-Li) polymer electrolytes to address these challenges is reported. Uniformly dispersed fluorinated graphene induces a unique grain refinement effect, which effectively improves the mechanical properties without excessively increasing the thickness of the polymer electrolyte. Significant reduction in polymer grain size enhances interfacial lithium ion (Li-ion) transport and homogenizes Li-ion flux, thereby improving Li-ion conductivity and promoting uniform Li plating/stripping. Furthermore, extensive characterizations show that fluorinated graphene is involved in the construction of a stable artificial interface, which effectively prevents the side reactions between the lithium metal anode and solvated molecules. As a result, the use of thin FPH-Li polymer electrolytes (thickness of approximate to 45 mu m) enables long-term Li plating/stripping with a small overpotential in Li/Li symmetrical cells and stable cycling of Li/LiNi0.6Co0.2Mn0.2O2 full cells with a high average Coulombic efficiency of 99.5% at 1.0 C. This work verifies the effectiveness of 2D materials in improving the comprehensive properties of polymer electrolytes and promotes the applications of SPEs in high-performance solid-state lithium batteries.
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