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JOURNAL OF ALLOYS AND COMPOUNDS · 2016 · IF 3.014

Superior effect of RbF on decreasing the dehydrogenation operating temperature of the LiNH2LiH system

Bao-Xia Dong,Long-Zheng Wang,Yun-Lei Teng,Zong-Wei Li,Juan Zhao

In this study, the superior effect of RbF on reducing the hydrogen desorption operating temperature of the Li N H system was demonstrated. By doping 5 mol% RbF in the LiNH 2 LiH system, we obtain the lowest hydrogen desorption peak temperature (211 °C) at a heating rate of 5 °C/min, which is approximately 69 °C lower than that of the pristine LiNH 2 LiH system. Moreover, the system starts to desorb H 2 at 120 °C, which is the lowest hydrogen desorption onset temperature. The hydrogen desorption peak and onset temperatures can be further decreased by doping more RbF. It is proposed that the RbH produced during heat treatment improves the dehydrogenation properties of the RbF-doped LiNH 2 LiH sample.

CAS / MDL: 7789-24-4 13446-74-7

研究领域: 材料科学 · 能源化学

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ACS Applied Materials & Interfaces · 2019 · IF 8.456

RbF as a Dendrite-Inhibiting Additive in Lithium Metal Batteries

Shaopeng Li,Shan Fang,Hui Dou,Xiaogang Zhang

Lithium metal is considered to be one of the most potential anode materials on account of its high theoretical specific capacity and lowermost electrochemical potential. Nevertheless, the critical challenges of dendrite growth and low Coulombic efficiency (CE) of the lithium metal anode during cycling prevent the commercial application of the lithium metal battery. Herein, rubidium fluoride (RbF) as additives is utilized to inhibit the lithium dendrite growth. Benefiting from the stronger electropositive property of Rb+, it can adsorb on the surface of protuberances during the lithium deposition process, form an electrostatic shielding field of the surface, and guide the uniform deposition of Li+. The CE can maintain above 90% with the additives of RbF in the carbonate electrolyte. Besides that, RbF improves the cycle life and decreases the polarization, a stable cycling performance of more than 1000 h is obtained, and the overvoltage is controlled below 100 mV in the cycling test of Li∥Li symmetrical cells at 0.5 mA cm–2. The addition of RbF offers a feasible way for the development of lithium metal batteries (LMBs) in the future.

研究领域: 储能 · 电化学 · 材料科学 · 锂金属电池

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Journal of Energy Chemistry · 2021 · IF 9.676

Synergy of mesoporous SnO2 and RbF modification for high-efficiency and stable perovskite solar cells

Qian Chen,Changtao Peng,Lin Du,Tian Hou,Wenjing Yu,Dong Chen,Hui Shu,Dejun Huang,Xiangqing Zhou,Jinyang Zhang,Wenfeng Zhang,Haijin Li,Jiale Xie,Yuelong Huang

Electron transport layer (ETL) is very critical to the performance of perovskite solar cells (PSCs), and optimization work on ETL has received extensive attentions especially on tin oxide (SnO 2 ) since it is an excellent ETL material widely applied in high-efficiency PSCs. Thereinto, introducing mesoporous structure and surface modification are two important approaches which are commonly applied. Herein, based on the previous work in low-temperature fabrication process of mesoporous SnO 2 (m-SnO 2 ), we introduced a modification process with rubidium fluoride (RbF) to the m-SnO 2 ETL, and successfully achieved a synergy of the m-SnO 2 and RbF modification: not only the shortcoming of the m-SnO 2 in interfacial traps was overcome, but also the carrier collection efficiency was further improved. The PSCs based on the m-SnO 2 ETL with RbF modification demonstrated outstanding performances: a champion power conversion efficiency (PCE) of 22.72% and a stability performance of maintaining 90% of the initial PCE after 300 h of MPP tracking were obtained without surface passivation of perovskite film. Hence, utilizing the abovementioned synergy is a cost-effective and feasible strategy for fabricating high-efficiency and stable PSCs since the fabrication process of the m-SnO 2 ETL is a kind of low temperature process and RbF is cheap.

CAS / MDL: 13446-74-7

研究领域: 材料科学 · 能源科学

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Superior effect of RbF on decreasing the dehydrogenation operating temperature of the LiNH2LiH system

RbF as a Dendrite-Inhibiting Additive in Lithium Metal Batteries

Synergy of mesoporous SnO2 and RbF modification for high-efficiency and stable perovskite solar cells