一步法剥离-氟化h-BN粉末对复合材料高温介电储能性能的增强机制

doi:10.19976/j.cnki.43-1448/TF.2026029

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Abstract To meet the demand of film capacitors under high-temperature extreme conditions, this work employed a powder surface engineering strategy to prepare surface fluorinated boron nitride nanosheet (F-BNNS) via a one-step ultrasonic exfoliation and simultaneous fluorination process. The F-BNNS was dispersed into a polyetherimide (PEI) matrix to fabricate nanocomposite films, and their high-temperature dielectric peformance, high-temperature breakdown strength, and energy storage performance were investigated. The results show that the exfoliation of hexagonal boron nitride (h-BN) and the construction of surface chemical active sites have been achieved in this paper. The incorporation of F-BNNS significantly enhances the high-temperature breakdown strength and energy density, achieving 575 MV/m and 5.01 J/cm³ at 150 ℃, and 501 MV/m and 3.89 J/cm³ at 200 ℃, far superior to pure PEI film and composite film with unmodified BN. The powder surface fluorination engineering introduces a highly electronegative fluorinated layer and deep energy level traps on BNNS, modulating charge transport and energy band structure at the filler-matrix interface, which significantly suppresses leakage current and space charge accumulation at high temperature, offering a new strategy for designing and preparing high-performance high-temperature polymer dielectrics via functional filler densign.

Key words： h-BN powder surface fluorination high-temperature insulation energy storage performance composite dielectric film

Received: 18 March 2026 Published: 08 September 2026

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	Articles by authors
	MA Xiaoqin
	YANG Fengyuan
	ZHAO Dongxu
	XIE Meiling
	JIN Xudong
	WANG JianNingxia

Cite this article:

MA Xiaoqin,YANG Fengyuan,ZHAO Dongxu, et al. Enhancement mechanism of one-step exfoliation-fluorination of h-BN powder on high-temperature dielectric energy storage of composites[J]. Materials Science and Engineering of Powder Metallurgy, 2026, 31(4): 413-422.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2026029 OR http://pmbjb.csu.edu.cn/EN/Y2026/V31/I4/413

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