Details

Autor(en) / Beteiligte

• Li, Tianyu
• Deng, Shiqing
• Zhu, Ruixue
• Yang, Jiyuan
• Xu, Shiqi
• Dong, Yongqi
• Liu, Hui
• Huo, Chuanrui
• Gao, Peng
• Luo, Zhenlin
• Diéguez, Oswaldo
• Huang, Houbing
• Liu, Shi
• Chen, Long-Qing
• Qi, He
• Chen, Jun

Titel

Ultrahigh-Efficiency Superior Energy Storage in Lead-Free Films with a Simple Composition

Ist Teil von

• Journal of the American Chemical Society, 2024-01, Vol.146 (3), p.1926-1934

Ort / Verlag

United States: American Chemical Society

Erscheinungsjahr

2024

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Dielectric capacitors are highly desired in modern electronic devices and power systems to store and recycle electric energy. However, achieving simultaneous high energy density and efficiency remains a challenge. Here, guided by theoretical and phase-field simulations, we are able to achieve a superior comprehensive property of ultrahigh efficiency of 90–94% and high energy density of 85–90 J cm–3 remarkably in strontium titanate (SrTiO3), a linear dielectric of a simple chemical composition, by manipulating local symmetry breaking through introducing Ti/O defects. Atomic-scale characterizations confirm that these Ti/O defects lead to local symmetry breaking and local lattice strains, thus leading to the formation of the isolated ultrafine polar nanoclusters with varying sizes from 2 to 8 nm. These nanoclusters account for both considerable dielectric polarization and negligible polarization hysteresis. The present study opens a new realm of designing high-performance dielectric capacitors utilizing a large family of readily available linear dielectrics with very simple chemistry.