Study on improvement in the amount of mechanical energy storage using carbon nanotube.

2018 Fiscal Year Final Research Report

• Project/Area Number: 16K04893
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Nanomaterials chemistry
• Research Institution: Suwa University of Science (2018); Tokyo University of Science, Suwa (2016-2017)
• Principal Investigator: Utsumi Shigenori 公立諏訪東京理科大学, 工学部, 准教授 (00454257)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Keywords: 単層カーボンナノチューブ / 捻り / 機械的エネルギー貯蔵 / 重量エネルギー密度 / 物理的修飾 / 化学的修飾

Outline of Final Research Achievements

The purpose of this study is to improve the amount of mechanical energy storage by twisting single wall carbon nanotube (SWCNT). The preparation method of rope samples consisting of SWCNT with 1.5 nm in diameter was established. The system was improved to measure the dynamic gravimetric energy density, and the average value of 0.22 MJ/kg and the maximum value of 0.45 MJ/kg were obtained. Various chemical and physical modifications were performed to strengthen rope samples. The average and maximum values were 0.30 and 0.76 MJ/kg for flash-light-irradiated samples, 0.32 and 0.68 MJ/kg for sulfur-reacted samples, and 0.27 and 0.82 MJ/kg for carbon-deposited samples. Considering that the gravimetric energy density was less than 0.1 MJ/kg at the beginning of this research, it is a great progress to be able to repeatedly prepare SWCNT ropes exceeding lithium-ion batteries (0.72 MJ/kg).

Free Research Field

ナノカーボン材料，物理化学，界面化学

Academic Significance and Societal Importance of the Research Achievements

カーボンナノチューブの高弾性・高強度に着目した機械的エネルギー貯蔵は格段の安全性・軽量性を備えており，貯蔵エネルギー量が既存デバイス（リチウムイオン電池やスーパーキャパシタ）の2-3倍になれば圧倒的に有利である。捻りという単純な機構から，再生可能エネルギー・移動体のエネルギー・四肢の運動エネルギーの貯蔵などあらゆる用途に応用が広がる。これまで有効利用できなかったエネルギーの活用にも適用ができる。