Citation: Huilan Li, Tingting Feng, Yufeng Liang, Mengqiang Wu. Construction of PMIA@PAN/PVDF-HFP/TiO₂ coaxial fibrous separator with enhanced mechanical strength and electrolyte affinity for lithium-ion batteries[J]. Chinese Chemical Letters, ;2023, 34(12): 108350. doi: 10.1016/j.cclet.2023.108350 shu

Construction of PMIA@PAN/PVDF-HFP/TiO₂ coaxial fibrous separator with enhanced mechanical strength and electrolyte affinity for lithium-ion batteries

School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, China

fengtt@uestc.edu.cn

mwu@uestc.edu.cn

Received Date: 12 February 2023
Revised Date: 13 March 2023
Accepted Date: 16 March 2023
Available Online: 23 March 2023

Figures(4)

Poly(m-phthaloyl-m-phenylenediamine) (PMIA) is promising as the separator in lithium-ion batteries (LIBs) for its excellent thermostability, insulation and self-extinguishing properties. However, its low mechanical strength and poor electrolyte affinity limit its application in LIBs. In this work, a new PMIA@polyacrylonitrile-polyvinylidene fluoride hexafluoropropylene-titanium dioxide (PMIA@PAN/PVDF-HFP/TiO₂) composite fibrous separator with a coaxial core-shell structure was developed by combining coaxial electrospinning, hot pressing, and heat treatment techniques. This separator not only inherits the exceptional thermostability of PMIA, showing no evident thermal shrinkage at 220 ℃, but also reveals improved mechanical strength (29.7 MPa) due to the formation of firm connections between fibers with the melted PVDF-HFP. Meanwhile, the massive polar groups in PVDF-HFP play a vital role in improving the electrolyte affinity, which renders the separator a high ionic conductivity of 1.36 × 10⁻³ S/cm. Therefore, the LIBs with PMIA@PAN/PVDF-HFP/TiO₂ separators exhibited excellent cycling and rate performance at 25 ℃, and a high capacity retention rate (76.2%) at 80 ℃ for 200 cycles at 1 C. Besides, the lithium metal symmetric battery assembled by the separator showed a small overpotential, indicating that the separator had a role in inhibiting lithium dendrites. In short, the PMIA@PAN/PVDF-HFP/TiO₂ separator possesses a wide application prospect in the domain of LIBs.
- Poly(m-phthaloyl-m-phenylenediamine) (PMIA),
- Fibrous separator,
- Coaxial electrospinning,
- Mechanical strength,
- Lithium-ion batteries
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Construction of PMIA@PAN/PVDF-HFP/TiO2 coaxial fibrous separator with enhanced mechanical strength and electrolyte affinity for lithium-ion batteries

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通讯作者: 陈斌, bchen63@163.com

Construction of PMIA@PAN/PVDF-HFP/TiO₂ coaxial fibrous separator with enhanced mechanical strength and electrolyte affinity for lithium-ion batteries