期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 7, 期 17, 页码 14539-14544出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b02099
关键词
LiCrTiO4; nanowires; cathode; Me2+/Li+ hybrid batteries
资金
- National Natural Science Foundation of China [51672235]
- National Ten Thousand Talents Program
- Program for Changjiang Scholars and Innovative Research Team in the University of Ministry of Education of China [IRT1081]
Magnesium-lithium hybrid batteries attract considerable attention due to combined advantages of metallic magnesium anode (free dendrite) and Li-driven reaction cathode (fast ion diffusion rate). In this work, nanowired LiCrTiO4 with moderate redox potential is chosen as a potential cathode material for magnesium-lithium hybrid batteries. LiCrTiO4 nanowires are made up of small dispersed nanoparticles. In such a structure, the diffusion/migration barrier of Li+ insertion is reduced and the infiltration of electrolyte is enhanced, leading to faster ion diffusion rates and smaller potential polarization. The Mg2+/Li+ hybrid battery exhibits a high reversible capacity (128.7 mA h g(-1) after 100 cycles at 50 mA g(-1)) and excellent rate performance (even at a high current density of 500 mA g(-1), a specific capacity of 110.1 mA h g(-1) can be still achieved, corresponding to 67.8% of that at 30 mA g(-1)). Notably, the ion storage mechanism of LiCrTiO4 nanowires in Mg2+/Li+ hybrid battery is systematically investigated by ex situ X-ray diffraction and ex situ X-ray photoelectron spectroscopy. This research demonstrates that the nanowired LiCrTiO4 cathode is a high-performance candidate for magnesium-lithium hybrid batteries.
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