Porous mullite fiber nonwoven separator materials containing Nano-MgO particles for the design of thermal batteries

摘要

Porous ceramic separator materials have been used to enhance the performance of thermal batteries but they are not sufficiently effective. In this study, we developed a porous ceramic fiber separator substrate using Mullite fiber (a kind of ceramic fiber) employing the wet-laid technology. The substrate was modified using magnesium acetate precursors to obtain a porous, flexible, strong ceramic fiber separator (CFS) containing Nano-MgO particles. Although the diameter of CFS exceeded 11.3 cm, it was relatively thin (approximately 0.3 mm). Application of CFS clearly improved the electrochemical performance of the conventional Li-B/LiF-LiCl-LiBr/FeS2 electrochemical system. Li-B/LiF-LiCl-LiBr/FeS2 electrochemical system fitted with CFS increases the specific capacity of the battery by 24% and yields a polarization resistance of 0.011 Omega even with a high current pulse density of 5000 mA.cm(-2). The findings of this study demonstrate that CFS can effectively improve performance of current thermal battery electrochemical systems.

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