Journal
ACS APPLIED ENERGY MATERIALS
Volume 4, Issue 4, Pages 4129-4137Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.1c00468
Keywords
plasticizer; room temperature; 3D framework; solid polymer electrolyte; solid-state battery
Funding
- National Key Research and Development Program o f China [2016YFB0100105]
- National Natural Science Foundation of China [U1964205, 51872303, 51902321]
- Zhejiang Provincial Natural Science Foundation of China [LD18E020004]
- Ningbo S&T Innovation 2025 Major Special Programme [2018B10061, 2018B10087, 2019B10044]
- Jiangxi Provincial Key R&D Program of China [20182ABC28007]
- Youth Innovation Promotion Association CAS [2017342]
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A composite solid polymer electrolyte with high ionic conductivity and good mechanical property has been proposed for next-generation solid-state lithium batteries. The solid-state LiFePO4/PEO-SN23-LiTFSI10-GF/Li battery shows excellent capacity retention after 100 cycles of testing.
Solid polymer electrolytes (SPEs) can alleviate the safety issues existing in commercialized lithium ion batteries with liquid electrolyte. However, the low room-temperature ionic conductivity and poor mechanical properties of current polymer electrolyte hinder its practical applications. Herein, a composite solid polymer electrolyte consisting of poly(ethylene oxide) (PEO), the solid plasticizer succinonitrile (SN), and a 3D framework glass fiber (GF) with high ionic conductivity and good mechanical property is proposed. The optimized composite electrolyte PEO-SN25-LiTFSI10-GF has a room-temperature ionic conductivity of 2.85 x 10(-4) S cm(-1), which is 100 times higher than that of pristine PEO. An electrochemical window up to 5.5 V and a tensile strength of over 8 MPa are also exhibited by the optimized composite electrolyte. The solid-state LiFePO4/PEO-SN23-LiTFSI10-GF/Li battery shows good cyclic performance with a capacity retention of 98.5% after 100 cycles at 0.2 C under room temperature, demonstrating a promising polymer composite electrolyte for the next-generation solid-state lithium batteries with high energy density and high safety.
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