2023 Fiscal Year Annual Research Report
リチウム金属負極の性能向上ために織物テンプレート法で特異構造な銅集電体の開発
| Project/Area Number |
22KJ0030
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| Allocation Type | Multi-year Fund |
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| Research Institution | Hokkaido University |
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Principal Investigator |
朱 瑞傑 北海道大学, 工学研究院, 特別研究員(PD)
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| Project Period (FY) |
2023-03-08 – 2024-03-31
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| Keywords | optimized Li deposition / 3D Cu current collector / channel-like structure / micron-sized pores / 3D Ni current collector / Li-S battery / enhanced sulfur redox / optimized Zn deposition |
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| Outline of Annual Research Achievements |
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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