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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS · 2024 ·Vol. 35 ·期 34 ·1-9 · IF 2.8

Anti-reduction of Ti4+ and improved quality factor in Cu-doped Ca0.61Nd0.26TiO3 ceramics

Gao Dawei,Ma Juncheng,Zhang Jiafen,Shi Qingang,Xiong Zhe,Zhang Xing,Tang Bin

The occurrence of "dark holes" is a common phenomenon in TiO 2 -based ceramics, resulting from the reduction of Ti 4+ under high-temperature and low-oxygen partial pressure sintering conditions. To achieve low dielectric loss, Ca 0.61 Nd 0.26 Ti 1- x Cu x O 3 ceramics were designed and prepared in this work. The results indicate that moderate doping of CuO not only enhances insulation resistivity and Q × f value but also reduces the positive τ f value. The Ca 0.61 Nd 0.26 Ti 0.98 Cu 0.02 O 3 sample exhibited the highest Q × f value of 16,895 GHz, contributing to the miniaturization and insertion loss of microwave devices.

CAS / MDL: 13463-67-7 471-34-1

研究领域: 材料科学 · 电子工程

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Energy Storage Materials · 2023 · IF 20.4

High-performance lithium metal batteries based on composite solid-state electrolytes with high ceramic content

Xiaoyu Zhang,Jinhuan Wang,Dongqi Hu,Wei Du,Chuanxin Hou,Huiyu Jiang,Yuting Wei,Xiao Liu,Fuyi Jiang,Jianchao Sun,Hua Yuan,Xiaoyu Huang

The large scale application of solid state lithium metal batteries based on NASICON-type Li 1+x Al x Ti 2-x (PO 4 ) 3 (LATP) electrolyte has been hindered by insufficient ion conductivity and interface instability due to the spontaneous Ti 4+ reduction reaction between Li metal and LATP. To address these issues, Li 1.7 Al 0.3-x Bi x Ti 1.7 (PO 4 ) 3 (0 ≤ x ≤ 0.03) (LABTP) electrolytes were prepared, and the influence of Bi substitution on the microstructure and conductivity of LATP were investigated. Suitable amount of Bi substitution accelerates densification and improves the ionic conductivity . Furthermore, unlike commonly used polyethylene oxide (PEO) and polyvinylidene difluoride (PVDF), polyvinylbutyral (PVB)-based quasi-solid electrolytes with LABTP is first-time proposed to improve the compatibility and stability of the LATP/Li interface. The synergistic effect of Bi doping and PVB reduces the reduction reaction of Ti 4+ . Small voltage hysteresis is observed in the corresponding Li||Li symmetric cells. The solid-state Li|LABTP@PVB|LiFePO 4 full cell can deliver a high capacity of 146.2 mAh g −1 and a stable cycling performance without reduction after 200 cycles.

研究领域: 材料科学 · 电化学 · 电池技术

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Anti-reduction of Ti4+ and improved quality factor in Cu-doped Ca0.61Nd0.26TiO3 ceramics

High-performance lithium metal batteries based on composite solid-state electrolytes with high ceramic content