2023-04-25 ノースカロライナ州立大学(NCState)
彼らはグラフェンとマンガン酸化物を使用して、繊維状の亜鉛イオン電池を作成するために特殊な製造工程を使用した。この技術は、将来的に衣服に統合できるようになるかもしれない。
＜関連情報＞
- https://news.ncsu.edu/2023/04/researchers-design-battery-prototype-with-fiber-shaped-cathode/
- https://pubs.acs.org/doi/10.1021/acsami.3c02989
異なるMnO2添加剤を用いた酸化グラフェン繊維の湿式紡糸について Wet Spinning of Graphene Oxide Fibers with Different MnO2 Additives
Nakarin Subjalearndee, Nanfei He, Hui Cheng, Panpanat Tesatchabut, Priew Eiamlamai, Somruthai Phothiphiphit, Orapan Saensuk, Pimpa Limthongkul, Varol Intasanta, Wei Gao and Xiangwu Zhang
ACS Applied Materials and Interfaces Published:April 5, 2023
DOI:https://doi.org/10.1021/acsami.3c02989
Abstract
We present the fabrication of graphene oxide (GO) and manganese dioxide (MnO2) composite fibers via wet spinning processes, which entails the effects of MnO2 micromorphology and mass loading on the extrudability of GO/MnO2 spinning dope and on the properties of resulted composite fibers. Various sizes of rod and sea-urchin shaped MnO2 microparticles have been synthesized via hydrothermal reactions with different oxidants and hydrothermal conditions. Both the microparticle morphology and mass loading significantly affect the extrudability of the GO/MnO2 mixture. In addition, the orientation of MnO2 microparticles within the fibers is largely affected by their microscopic surface areas. The composite fibers have been made electrically conductive via chemical or thermal treatments and then applied as fiber cathodes in Zn-ion battery prototypes. Thermal annealing under an argon atmosphere turns out to be an appropriate method to avoid MnO2 dissolution and leaching, which have been observed in the chemical treatments. These rGO/MnO2 fiber cathodes have been assembled into prototype Zn-ion batteries with Zn wire as the anode and xanthan-gum gel containing ZnSO4 and MnSO4 salts as the electrolyte. The resulted electrochemical output depends on the annealing temperature and MnO2 distribution within the fiber cathodes, while the best performer shows stable cycling stability at a maximum capacity of ca. 80 mA h/g.
