期刊
ELECTROCHIMICA ACTA
卷 401, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2021.139496
关键词
Thermal battery; Hierarchical V2O5; Structured confinement effects; Binder-free MgO; High/stable discharge voltage platforms
资金
- National Natural Science Foundation of China [51904148]
- Natural Science Foundation of Shandong Province [ZR2019PEE035]
- PhD early development program of Liaocheng University [318051829]
Hierarchical V2O5/molten salt cathodes with binder-free MgO are designed to improve the conductivity of thermal batteries. By optimizing the composition and structure, high specific capacity and energy can be achieved under certain operating conditions, providing a new strategy for solid-state batteries.
Despite the excellent thermal/air stability and high discharge voltage of V2O5 cathodes in thermal batteries, their poor conductivity must be overcome by adding molten salt. To ensure the mechanical integrity of V2O5 electrodes, MgO is used as a binder to suppress flow of molten salt. The poor conductivity of MgO increases the resistance, and leads to rapid attenuation of the voltage. Hence, we design a hierarchical V2O5/molten salt cathode with binder-free MgO by using a novel liquid mixing method. The molten salt is anchored on the interspace of hierarchical V2O5 with structured confinement effects. Cathodes synthesized with 20 wt.% of molten salt exhibit a short active time and high specific energy. To further improve electronic conductivity, 10 wt.% Ni is added into the aforementioned cathodes. The optimum specific capacity (255.80 mAh g(-1)) and specific energy (559.74 Wh Kg(-1)) can be obtained with 0.1 A cm(-2) at 500 degrees C and a cut-off voltage of 1.6 V. Excellent discharge performance is achieved because of the low resistance (high Li+ diffusion and well-organized electron transport path), good mechanical integrity, and complete chemical reaction. This strategy provides a new way to regulate the conductivity of binder-free solid-state batteries. (C) 2021 Elsevier Ltd. All rights reserved.
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