Development of Electric Energy Storage Devices Utilizing Biomaterials

作为生物材料存在的天然聚合物已被应用于电能存储装置的辅助材料，本研究的目的主要是为了提高电能存储装置的功率性能。首先，研究了dna修饰纳米碳电极的EDLC特性，发现其充放电过程中的离子扩散阻力显著降低。此外，将海藻酸和壳聚糖作为生物聚合物组成的凝胶电解质应用于EDLC，电极界面电阻的下降实现了输出功率的提高。研究发现，这些凝胶电解质也适用于锂离子电池。此外，我们发现这些生物聚合物材料也可以应用于EDLC电极和锂离子电池电极的粘合剂，并且在每个功率器件的输出上都有很大的提高。

The natural polymers which exist as biomaterial have been applied to auxiliary materials for electric energy storage devices, and the aim of this research was mainly to improve power performance of such devices. First, the characteristics of EDLC with DNA-modified nanocarbon electrodes were examined, and a sharp decrease in ion-diffusion resistance of charge and discharge processes was attained. Moreover, the gel electrolytes which consists of alginic acid and chitosan as biopolymer were applied to EDLC, and the fall of electrode-interface resistance realized improvement in an output power. It was found that these gel electrolytes are applicable also to a lithium-ion battery. Furthermore, we found that these biopolymeric materials can be applied also to the binder of an EDLC electrode as well as a lithium ion battery electrode, and attained the large improvement in each power-device output.