| 研究開始時の研究の概要 |
Lithium (Li) metal batteries that use Li metal directly as the anode have extremely high energy-density and are considered to be the "holy grail" in the field of electrochemical energy storage. By designing porous current collectors with specific structures, electrodes with excellent performance for Li metal batteries may be achieved. This research uses a unique template method to synthesize porous current collectors for accommodating electrodes, and the electrochemical behavior of these new electrodes in the battery will be studied, thus contribute to the development of novel batteries.
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| 研究実績の概要 |
In this year, firstly, porous copper (Cu) and nickel (Ni), obtained through the textile template method, were used as cathode current collectors in lithium-sulfur (Li-S) batteries to investigate their impact on battery performance. Porous Ni, supporting polyacrylonitrile-sulfur cathodes, showed excellent catalysis in sulfur's redox reactions, with Li-S batteries achieving initial capacities of 1903 mAh/g, far exceeding commercial Ni foam's 689.6 mAh/g. Additionally, the study explored porous metal as anode current collectors for zinc-ion batteries, where porous copper was proved ideal for uniform zinc (Zn) deposition and suppressing Zn dendrite formation.
Throughout this study, it was demonstrated that porous metal with channel-like porous structures, prepared via the textile-template method, could optimize Li deposition when capacities lower than 1mAh/cm2. Channels with a micron-sized pore were found to be suitable for Li deposition rather than nano-pores. The growth of larger Li crystals will hinder the subsequent electrodeposition of Li within the channel cavities, but introducing lithiophilic nanoparticles can slightly mitigate this issue. Moreover, the same design was applicable for optimizing Zn metal deposition in Zn-ion batteries. Additionally, employing the prepared porous metals as catalysts for electrode reactions in Li-S batteries also achieved notable success. Over the three years, several papers have been published, and the results were also presented at conferences, e.g., ECS meetings, etc. Other outcomes will be further showcased after refinement.
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