Boehmite/Polyacrylonitrile Composite Nanofiber Separator with Enhanced Ionic Conductivity and Thermal Stability for Lithium-Ion Batteries

Zhi-Jun Tu; Sheng-Bin Cao; Xiao-Song Liu; Xiao-Peng Li; Wei Luo; Dávid István Kis

doi:10.1007/s10118-026-3751-1

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Boehmite/Polyacrylonitrile Composite Nanofiber Separator with Enhanced Ionic Conductivity and Thermal Stability for Lithium-Ion Batteries

RESEARCH ARTICLE | Updated：2026-08-19

- Boehmite/Polyacrylonitrile Composite Nanofiber Separator with Enhanced Ionic Conductivity and Thermal Stability for Lithium-Ion Batteries
- Boehmite/Polyacrylonitrile Composite Nanofiber Separator with Enhanced Ionic Conductivity and Thermal Stability for Lithium-Ion Batteries
- Chinese Journal of Polymer Science 2026年44卷页码：1-15
- Affiliations：
  
  a.School of Materials, Shanghai Dianji University, Shanghai 201306, China
  b.Oxford Suzhou Centre for Advanced Research, Suzhou 215123, China
  c.College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
  d.Department of Innovative Vehicles and Materials, GAMF Faculty of Engineering and Computer Science, John von Neumann University, Kecskemét 6000, Hungary
- Author bio：
  
  caosb@sdju.edu.cn
- Funds：
  
  The authors declare no interest conflict.Electronic supplementary information (ESI) is available free of charge in the online version of this article at http://doi.org/10.1007/s10118-026-3751-1.The date in this study can be available from the authors uopn reasonable reasons.
- DOI：10.1007/s10118-026-3751-1
  中图分类号：
- 收稿：2026-03-31，
  
  录用：2026-05-18，
  
  网络首发：2026-08-18，
  
  纸质出版：2026-06
- Accepted：
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Tu, Z. J.; Cao, S. B.; Liu, X. S.; Li, X. P.; Luo, W.; Kis, D. I. Boehmite/polyacrylonitrile composite nanofiber separator with enhanced ionic conductivity and thermal stability for lithium-ion batteries. Chinese J. Polym. Sci. https://doi.org/10.1007/s10118-026-3751-1

Zhi-Jun Tu, Sheng-Bin Cao, Xiao-Song Liu, et al. Boehmite/Polyacrylonitrile Composite Nanofiber Separator with Enhanced Ionic Conductivity and Thermal Stability for Lithium-Ion Batteries[J/OL]. Chinese Journal of Polymer Science, 2026, 441-15.
Tu, Z. J.; Cao, S. B.; Liu, X. S.; Li, X. P.; Luo, W.; Kis, D. I. Boehmite/polyacrylonitrile composite nanofiber separator with enhanced ionic conductivity and thermal stability for lithium-ion batteries. Chinese J. Polym. Sci. https://doi.org/10.1007/s10118-026-3751-1 DOI：

Zhi-Jun Tu, Sheng-Bin Cao, Xiao-Song Liu, et al. Boehmite/Polyacrylonitrile Composite Nanofiber Separator with Enhanced Ionic Conductivity and Thermal Stability for Lithium-Ion Batteries[J/OL]. Chinese Journal of Polymer Science, 2026, 441-15. DOI： 10.1007/s10118-026-3751-1.

摘要

Abstract

Polyethylene (PE) and polypropylene (PP) are widely used in commercial lithium-ion battery (LIB) separators owing to their high mechanical strength and chemical stability. However

both polymers suffer from poor high-temperature tolerance

low porosity

and inadequate electrolyte wettability

making it difficult to reconcile electrochemical performance with safety under thermal stress. Developing advanced lithium-i

on battery separators is therefore crucial for achieving high efficiency

safe LIBs. This study presents a boehmite/polyacrylonitrile (BM/PAN) composite nanofiber separator fabricated by electrospinning and systematically examines how BM loading affects separator microstructure and electrochemical behavior. Compared with commercial PP separators

the BM/PAN composites exhibit a unique three-dimensional interconnected fiber network

together with markedly improved wettability

thermal stability and electrochemical properties. The optimal formulation contains 4 wt% BM (denoted PAN-BM-4) exhibited an outstanding wettability with electrolyte uptake of 692.5% with the porosity of 80.7% and electrolyte contact angle of 25.5°

ensuring rapid electrolyte infiltration and efficient ion transport. It also displayed a higher mechanical property with tensile strength of 7.9 MPa and elongation at break of 27% (cf. 6.5 MPa and about 45% for pure PAN)

indicating enhanced structural integrity. Meanwhile

such PAN-BM-4 separator demonstrates an excellent thermal stability with negligible shrinkage at 200 °C and a residual mass of 57.6% at 800 °C

effectively mitigating the thermal-runaway risk of conventional separators. Moreover

as to the electrochemical performance

this unique PAN-BM-4 separator showed an ionic conductivity of 3.31 mS/cm

more than six times that of commercial PP

and the electrochemical stability window exceeding 5.5 V (versus Li

/Li) and a Li

transference number (

) of 0.42

substantially higher than PP (0.28) and pure PAN (0.34)

reflecting enhanced selective Li

transport. Besides

in half-cell testing

the PAN-BM-4 separator delivers an initial discharge capacity of 140.6 mAh/g at 0.5 C with 88.3% capacity retention after 100 cycles. In summary

this work establishes a viable materials-design strategy and experimental framework for next-generation LIB separators that simultaneously achieve high ionic conductivity

superior therm

al stability and favorable interfacial compatibility.

关键词

Keywords

references

Zeng, Z.; Dong, Y.; Yuan, S.; Zhao, W.; Wang, L.; Liu, S.; Yang, Y.; Ge, P.; Sun, W.; Ji, X. Natural mineral compounds in energy-storage systems: development, challenges, prospects. Energy Storage Mater. 2022 , 45 , 442−464..

Lingappan, N.; Lee, W.; Passerini, S.; Pecht, M. A comprehensive review of separator membranes in lithium-ion batteries. Renew. Sustain. Energy Rev. 2023 , 187 , 113726..

Yu, Y.; Liu, M.; Chen, Z.; Zhang, Z.; Qiu, T.; Hu, Z.; Xiang, H.; Zhu, L.; Xu, G.; Zhu, M. Advances in nonwoven-based separators for lithium-ion batteries. Adv. Fiber Mater. 2023 , 5 , 1827−1851..

Lagadec, M. F.; Zahn, R.; Wood, V. Characterization and performance evaluation of lithium-ion battery separators. Nat. Energy 2019 , 4 , 16−25..

Liu, J. H.; Wang, P.; Gao, Z.; Li, X. Review on electr ospinning anode and separators for lithium ion batteries. Renew. Sustain. Energy Rev. 2024 , 189 , 113939..

Wang, Y.; Zhuang, W.; Bian, H.; Yang, B.; Bin, D.; Shi, J.; Lu, H. Lithium-ion battery separator using inorganic materials: a mini review. J. Power Sources 2025 , 643 , 237015..

Jiang, Y.; Ding, Y.; Zhang, P.; Li, F.; Yang, Z. Temperature-dependent on/off PVP@TiO 2 separator for safe Li-storage. J. Membr. Sci. 2018 , 565 , 33−41..

Shi, C.; Zhang, P.; Huang, S.; He, X.; Yang, P.; Wu, D.; Zhao, J. Functional separator consisted of polyimide nonwoven fabrics and polyethylene coating layer for lithium-ion batteries. J. Power Sources 2015 , 298 , 158−165..

Wu, D.; Shi, C.; Huang, S.; Qiu, X.; Wang, H.; Zhan, Z.; Lin, L. Electrospun nanofibers for sandwiched polyimide/poly(vinylidene fluoride)/polyimide separators with the thermal shutdown function. Electrochim. Acta 2015 , 176 , 727−734..

Sun, G.; Liu, B.; Niu, H.; Hao, F.; Chen, N.; Zhang, M.; Wu, D. In situ welding: superb s trength, good wettability and fire resistance tri-layer separator with shutdown function for high-safety lithium ion battery. J. Membr. Sci. 2020 , 595 , 117509..

Wang, K.; Wang, W.; Wang, Y.; Wang, M. Dual phase change separator combining cooling and thermal shutdown functions for Li-ion battery with enhanced safety. Chem. Eng. J. 2024 , 481 , 148538..

Zheng, G.; Zeng, Z.; Shao, Z.; Shen, R.; Li, H.; Jiang, J.; Liu, Y. Coaxial electrospun core-shell lithium-ion battery separator with flame retardant and thermal shutdown functions. Mater. Chem. Phys. 2023 , 301 , 127647..

Kim, T. H.; Kim, M.; Kim, E. J.; Ju, M.; Kim, J. S.; Lee, S. H. Highly stretchable thermoplastic polyurethane separators for Li-ion batteries based on non-solvent-induced phase separation method. Polymers 2024 , 16 , 357..

Zhu, H.; Dong, B.; Cai, X.; Xi, L.; Zhang, P.; Hao, Y.; Zeng, R. In situ covalent crosslinking strategy to construct highly stable composite separators for lithium-ion batteries. Chem. Eng. J. 2024 , 488 , 151120..

Tang, W.; Liu, Q.; Luo, N.; Chen, F.; Fu, Q. High safety and electrochemical performance electrospun para-aramid nanofiber composite separator for lithium-ion battery. Compos. Sci. Technol. 2022 , 225 , 109479..

He, J.; Yang, L.; Ruan, X.; Liu, Z.; Liao, K.; Duan, Q.; Zhan, Y. Electrospun PVDF-based polymers for lithium-ion battery separators: a review. Polymers 2024 , 16 , 2895..

Cai, M.; Yuan, D.; Zhang, X.; Pu, Y.; Liu, X.; He, H.; Ning, X. Lithium ion battery separator with improved performance via side-by-side bicomponent electrospinning of PVDF-HFP/PI followed by 3D thermal crosslinking. J. Power Sources 2020 , 461 , 228123..

Chen, Y.; Song, Z.; Liu, H.; Xu, H.; Xi, Y.; Yin, C.; Zhou, L. Cross-linking synergistic effects to enhance the comprehensive properties of electrospun polyimide nanofiber membranes for advanced lithium-ion batteries. ACS Sustainable Chem. Eng. 2024 , 12 , 5953−5964..

Gong, W.; Zhang, Z.; Wei, S.; Ruan, S.; Shen, C.; Turng, L. S. Thermosensitive polyacrylonitrile/polyethylene oxide/polyacrylonitrile membrane separators for prompt and safer thermal lithium-ion battery shutdown. J. Electrochem. Soc. 2020 , 167 , 020509..

[Chen, Z.; Guan, M.; Cheng, Y.; Li, H.; Ji, G.; Chen, H.; Wu, C. Boehmite-enhanced poly(vinylidene fluoride-co-hexafluoropropylene)/polyacrylonitrile (PVDF-HFP/PAN) coaxial electrospun nanofiber hybrid membrane: a superior separator for lithium-ion batteries. Adv. Compos. Hybrid Mater. 2023 , 6 , 219..

Li, Y.; Pan, C.; Gan, F.; Lin, Z. X.; Yu, J. C.; Wei, Z. Z.; Zhao, Y. Robust composite separator randomly interwoven by PI and pre-oxidized PAN nanofibers for high performance lithium-ion batteries. Chinese J. Polym. Sci. 2024 , 42 , 1768−1779..

Wang, Y.; Wang, Q.; Wei, X.; Song, Z.; Lan, Y.; Luo, W.; Li, X. A novel three-dimensional boehmite nanowhiskers network-coated polyethylene separator for lithium-ion batteries. Ceram. Int. 2021 , 47 , 10153−10162..

Li, X.; Chen, S.; Xia, Z.; Li, L.; Yuan, W. High performance of boehmite/polyacrylonitrile composite nanofiber membrane for polymer lithium-ion battery. RSC Adv. 2020 , 10 , 27492−27501..

Jafaripour, H.; Sanaee, Z.; Mahdavi, H. Polymer-less electrospinning for realization of silica nanofibers membrane as a flexible separator with ultra-high electrolyte uptake, for high safety lithium ion batteries. J. Power Sources 2025 , 631 , 236237..

Nien, Y. H.; Chang, C. N.; Chuang, P. L.; Hsu, C. H.; Liao, J. L.; Lee, C. K. Fabrication and characterization of nylon 66/PAN nanofibrous film used as separator of lithium-ion battery. Polymers 2021 , 13 , 1984..

Wang, X.; Cui, X.; He, B.; Zhao, Q.; Wang, Y.; Xiao, D.; Li, K. A high-safety lithium-ion battery electrospun separator with Si 3 N 4 -assisted sulfonated poly(ether ether ketone) for regulating lithium flux. J. Colloid Interface Sci. 2025 , 678 , 460−471..

Wang, J.; Sun, X.; Sun, X.; He, C.; Li, L.; Wang, W.; Huang, Y. Superior and safer lithium-ion batteries enabled by electrospun poly(m-phenylene isophthalamide)-based separator with high heat resistance and flame retardance. J. Energy Storage 2025 , 137 , 118697..

Li, H.; Feng, T.; Liang, Y.; Wu, M. Construction of PMIA@PAN/PVDF-HFP/TiO 2 coaxial fibrous separator with enhanced mechanical strength and electrolyte affinity for lithium-ion batteries. Chin. Chem. Lett. 2023 , 34 , 108350..

Gu, J. P.; Zhang, K. Y.; Li, X. T.; Dong, J.; Zhang, Q. H.; Zhao, X. Construction of Safety and Non-Flammable Polyimide Separator Containing Carboxyl Groups for Advanced Fast Charging Lithium-Ion Batteries. Chinese J. Polym. Sci. 2022 , 40 , 345−354..

Al-Okaidy, H. S.; Waisi, B. I. The effect of electrospinning parameters on morphological and mechanical properties of PAN-based nanofibers membrane. Baghdad Sci. J. 2023 , 20 , 1433−1433..

Shayapat, J.; Chung, O. H.; Park, J. S. Electrospun polyimide-composite separator for lithium-ion batteries. Electrochim. Acta 2015 , 170 , 110−121..

Meera, K.; Ramesan, M. T. Tailoring the performance of boehmite nanoparticles reinforced carboxymethyl chitosan/cashew gum blend nanocomposites via green synthesis. Polymer 2023 , 268 , 125706..

Kirecci, A.; Özkoç, Ü.; İçoğlu, H. İ. Determination of optimal production parameters for polyacrylonitrile nanofibers. J. Appl. Polym. Sci. 2012 , 124 , 4961−4968..

Habeeb, S. A.; Rajabi, L.; Dabirian, F. Production of polyacrylonitrile/boehmite nanofibrous composite tubular structures by opposite-charge electrospinning with enhanced properties from a low-concentration polymer solution. Polym. Compos. 2020 , 41 , 1649−1661..

Guo, M.; Zhu, H.; Wan, P.; Xu, F.; Wang, C.; Lu, S.; Xu, J. Freestanding and ultra-flexible PAN/ZIF-67 hybrid membrane with controlled porosity for high-performance and high-safety lithium batteries separator. Adv. Fiber Mater. 2022 , 4 , 1511−1524..

Chen, X.; Yu, Z.; Cui, W.; Ding, Y.; Wu, J.; Hou, Y.; Gong, G. Surfactant-Enabled BM particle-embedded coaxial PVDF/PEI electrospun membranes enhancing Lithium-Ion battery safety. Chem. Eng. J. 2025 , 503 , 158225..

Szewczyk, P. K.; Ura, D. P.; Metwally, S.; Knapczyk-Korczak, J.; Gajek,M.; Marzec, M. M.; Stachewicz, U. Roughness and fiber fraction dominated wetting of electrospun fiber-based porous meshes. Polymers 2018 , 11 , 34..

Gong, X.; Xiao, Q.; Li, Q. Y.; Liang, W. C.; Chen, F.; Li, L. Y.; Ren, S. J. Cross-linked electrospun gel polymer electrolytes for lithium-ion batteries. Chinese J. Polym. Sci. 2024 , 42 , 1021−1028..

Yang, C.; Tong, H.; Luo, C.; Yuan, S.; Chen, G.; Yang, Y. Boehmite particle coating modified microporous polyethylene membrane: A promising separator for lithium ion batteries. J. Power Sources 2017 , 348 , 80−86..

Choi, E. S.; Lee, S. Y. Particle size-dependent, tunable porous structure of a SiO 2 /poly(vinylidene fluoride-hexafluoropropylene)-coated poly(ethylene terephthalate) nonwoven composite separator for a lithium-ion battery. J. Mater. Chem. 2011 , 21 , 14747−14754..

[Luo, Z.; Lin, Z.; Lu, J.; Zhang, D.; Li, Y.; Liu, L.; Liu, D. Hydrogen-bonding mesoporous boehmite orchestrating anion-derived solvation regulation and confinement toward dendrite-free lithium anodes. Adv. Compos. Hybrid Mater . 2026 , 9 , 70..

Yu, J.; Dong, N.; Liu, B.; Tian, G.; Qi, S.; Wu, D. A newly-developed heat-resistance polyimide microsphere coating to enhance the thermal stability of commercial polyolefin separators for advanced lithium-ion battery. Chem. Eng. J. 2022 , 442 , 136314..

Lee, J. H.; Nathan, M. G. T.; Kim, H. W.; Lee, S. M.; Kim, H. I.; Kim, J. H.; Kim, J. K. A High-stable polyacrylonitrile/ceramic composite membranes for high-voltage lithium-ion batteries. Mater. Chem. Phys. 2022 , 291 , 126516..

Ding, W.; Liu, Y.; Xu, L. Batch preparation and performance study of boehmite-based electrospun nanofiber separators for lithium-ion batteries. Molecules 2024 , 29 , 3938..

Peng, F.; Jiang, Y.; Liu, F.; Feng, J.; Feng, J.; Li, L. Hydrothermal assisted synthesis of heat resistant, well-crystallized aerogels constructed by boehmite nano rods. Ceram. Int. 2022 , 48 , 16232−16240..

Deng, J.; Cao, D.; Yang, X.; Zhang, G. Cross-linked cellulose/carboxylated polyimide nanofiber separator for lithium-ion battery application. Chem. Eng. J. 2022 , 433 , 133934..

Hou, Y.; Huang, Z.; Chen, Z.; Li, X.; Chen, A.; Li, P.; Zhi, C. Bifunctional separators design for safe lithium-ion batteries: Suppressed lithium dendrites and fire re tardance. Nano Energy 2022 , 97 , 107204..

Gao, T.; Tian, P.; Xu, Q.; Pang, H.; Ye, J.; Ning, G. Class of boehmite/polyacrylonitrile membranes with different thermal shutdown temperatures for high-performance lithium-ion batteries. ACS Appl. Mater. Interfaces 2022 , 15 , 2112−2123..

Yanilmaz, M.; Lu, Y.; Dirican, M.; Fu, K.; Zhang, X. Nanoparticle-on-nanofiber hybrid membrane separators for lithium-ion batteries via combining electrospraying and electrospinning techniques. J. Membr. Sci. 2014 , 456 , 57−65..

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