Journal
NANOSCALE RESEARCH LETTERS
Volume 15, Issue 1, Pages -Publisher
SPRINGER
DOI: 10.1186/s11671-020-03355-4
Keywords
Solid-state electrolyte; Polyethylene oxide; Grain boundary; Reforming; Li-ion battery
Funding
- National Natural Science Foundation of China [51702040, 51402045]
- Fundamental Research Funds for the Central Universities [ZYGX2017KYQD193, ZYGX2018J084]
- Guangdong Provincial Key Laboratory of Energy Materials for Electric Power [2018B030322001]
- Major Project of Education Department in Sichuan [18ZB0229]
- Sichuan Province Science and Technology Support Program [20YYJC4163, 18ZDYF2973]
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Polyethylene oxide (PEO)-based solid polymer electrolyte (SPE) is considered to have great application prospects in all-solid-state li-ion batteries. However, the application of PEO-based SPEs is hindered by the relatively low ionic conductivity, which strongly depends on its crystallinity and density of grain boundaries. In this work, a simple and effective press-rolling method is applied to reduce the crystallinity of PEO-based SPEs for the first time. With the rolled PEO-based SPE, the LiFePO4/SPE/Li all-solid li-ion battery delivers a superior rechargeable specific capacity of 162.6 mAh g(-1) with a discharge-charge voltage gap of 60 mV at a current density of 0.2 C with a much lower capacity decay rate. The improvement of electrochemical properties can be attributed to the press-rolling method, leading to a doubling conductivity and reduced activation energy compared with that of electrolyte prepared by traditional cast method. The present work provides an effective and easy-to-use grain reforming method for SPE, worthy of future application.
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