Stimuli-responsive Open-shell Species of Heavy Group 14 Elements for the Energy Storage System

2016 Fiscal Year Final Research Report

• Project Area: Stimuli-responsive Chemical Species for the Creation of Functional Molecules
• Project/Area Number: 24109006
• Research Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: University of Tsukuba
• Principal Investigator: SEKIGUCHI Akira 筑波大学, 数理物質系, 教授 (90143164)
• Co-Investigator(Renkei-kenkyūsha): ICHINOHE MASAAKI 筑波大学, 数理物質系, 准教授 (90271858) ; NAKAMOTO MASAAKI 筑波大学, 数理物質系, 講師 (90334044)
• Project Period (FY): 2012-06-28 – 2017-03-31
• Keywords: 開殻系分子 / 感応性分子 / 高周期14族元素 / スピン / 二次電池 / ラジカル / レドックス

Outline of Final Research Achievements

The electronic properties of organic materials are understood in terms of their charge and spin. Since organic radical species can undergo fast charge transfer, they are expected to be applied to active battery materials. We developed new anode materials of the secondary batteries to store energy using heavy group 14 element radicals. Si radical battery showed remarkable cycle stability without significant loss of power density. Utilizing the reversible redox process between hypervalent sulfur radicals and the corresponding anions, we also developed bipolar radical battery with high output voltage of 2 V. We also found that dendritic Li formation on the anode surface is avoided up to a practical current density of 10 mA/g at 5 °C when the three-dimensional amorphous polysilynes (RSi)n (R = Me, Ph) are used as anode materials, affording reversible capacities of 244 mAh/g and 180 mAh/g, respectively.

Free Research Field

有機元素化学