期刊
ACS APPLIED ENERGY MATERIALS
卷 4, 期 8, 页码 8454-8464出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.1c01658
关键词
PVDF; PVA; hydrogen bond; relaxor ferroelectric; discharge energy density
资金
- National Natural Science Foundation of China [92066204, 51773166, 52073225, 52003214]
- Key Laboratory Construction Program of Xi'an Municipal Bureau of Science and Technology [201805056ZD7CG40]
- Foundation of National Ministry and Commission [613262]
- Fundamental Research Funds for the Central Universities [xzy012020035]
- China Postdoctoral Science Foundation [2019M663699, 2020T130507]
By introducing PVA side chains into PVDF and constructing hydrogen bonds, P(VTrCT)-g-PVA materials with suppressed ferroelectric loss and enhanced breakdown strength were successfully fabricated, leading to improved energy density and charge-discharge efficiency.
Polymer-based dielectrics with high energy density and low dielectric loss are urgently needed in microelectronic equipment and high-power density electric energy storage devices. In an effort to overcome the disadvantage of the high energy loss of poly(vinylidene fluoride) (PVDF)-based ferroelectric fluoropolymers, herein, a series of poly(vinylidene fluoride-co-trifluoroethylene-co- chlorotrifluoroethylene)-g-poly(vinyl alcohol) [P(VTrCT)-g-PVA] were fabricated using the reversible addition-fragmentation chain transfer polymerization procedure. The PVA side chain shows great compatibility with the PVDF main chain and the hydrogen bond could be constructed among the hydroxyl and ester groups, which is responsible for the suppressed ferroelectric loss and enhanced breakdown strength and thus improved energy density and charge-discharge efficiency observed in the P(VTrCT)-g-PVAs. The graft copolymer containing 23 mol % PVA shows the maximum discharge energy density of 13.6 J/cm(3) at 500 MV/m. The work demonstrates that the hydrogen bond constructed based on the hydroxyl group may offer a strategy to tune the ferroelectric and energy storage performance of PVDF-based fluoropolymers.
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