Citation: Dongyang Chen, Xiaoxu Liu, Haonan Chen, Yaru Wang, Jing Li, Jiaming Sun, Xiaofeng Wang, Qiong Liu. Defect engineering using Ti-doped calcium niobate nanosheets in polymer-based dielectrics for high temperature capacitance[J]. Chinese Chemical Letters, ;2026, 37(9): 111436. doi: 10.1016/j.cclet.2025.111436 shu

Defect engineering using Ti-doped calcium niobate nanosheets in polymer-based dielectrics for high temperature capacitance

Dongyang Chen ^a ,
Xiaoxu Liu ^{a, *,} ,
Haonan Chen ^a ,
Yaru Wang ^a ,
Jing Li ^a ,
Jiaming Sun ^a ,
Xiaofeng Wang ^{b, *,} ,
Qiong Liu ^c

a.
School of Materials Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science and Technology, Xi'an 710021, China
b.
School of Mechanical and Electrical Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
c.
Xi'an Herong New Energy Technology Co., Ltd., Xi'an 710021, China

xiaoxuliu@sust.edu.cn

ansteelmaker@163.com

Received Date: 27 April 2025
Revised Date: 9 June 2025
Accepted Date: 10 June 2025
Available Online: 10 June 2025

Figures(5)

Although the incorporation of fillers has improved the high temperature (150–200 ℃) capacitance of polymer composite dielectrics, effective strategies for designing filler-matrix interface structures remains a formidable challenge. Herein, defect-rich nanosheets (Ca₂Nb_2.75Ti_0.25O₁₀, CT) were coated with a zeolite imidazolate frameworks-8 (ZIF-8, Zn(C₄H₅N₂)₂) layer (mCT). The mCT was integrated into polyetherimide (PEI) to create the polymer-based dielectrics. The defects on the surface of the negative CT nanosheets exhibited strong anchoring effects on the Zn²⁺ in ZIF-8, enhancing the filler-coating layer interface. Additionally, X-ray absorption fine structure analysis and density functional theory confirmed that the porous ZIF-8 coating layer forms strong coordination bonds with the PEI molecular chains, thereby an increased band gap (3.3 eV) of PEI/mCT compared to PEI (3.0 eV). It demonstrated exceptional performance at high temperatures, achieving ultra-high energy storage densities of 5.25 and 4.47 J/cm³ with efficiency > 90% at 150 and 200 ℃, which are higher than PEI (0.4 and 0.4 J/cm³). This work offers a new approach and reference for designing high-temperature polymer composite dielectrics for energy storage applications.
- Defect engineering,
- Titanium-doped calcium niobate nanosheets,
- Inorganic-organic interface,
- Polymer dielectrics,
- High temperature capacitance
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