• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to project page

2017 Fiscal Year Annual Research Report

Development of new rechargeable batteries with superconcentrated electrolytes

Research Project

Project/Area Number 16F16051
Research InstitutionThe University of Tokyo

Principal Investigator

山田 淳夫  東京大学, 大学院工学系研究科(工学部), 教授 (30359690)

Co-Investigator(Kenkyū-buntansha) WANG JIANHUI  東京大学, 工学(系)研究科(研究院), 外国人特別研究員
Project Period (FY) 2016-04-22 – 2018-03-31
Keywordssodium-ion battery / lithium-ion battery / electrolyte / safety
Outline of Annual Research Achievements

Severe safety concerns are currently impeding the large-scale employment of lithium/sodium batteries. Conventional electrolytes are highly flammable and volatile, which may cause catastrophic fires or explosions. Efforts to introduce flame-retardant solvents into the electrolytes have generally resulted in compromised battery performance because those solvents do not suitably passivate carbonaceous anodes. We propose a salt-concentrated electrolyte design to resolve this dilemma via the formation of a robust inorganic passivation film on the anode. We demonstrated that a concentrated electrolyte using a salt and a popular flame-retardant solvent (trimethyl phosphate), without any additives or soft binders, realized stable charge-discharge cycling of both hard carbon and graphite anodes for more than 1000 cycles (over one year) with negligible degradation; this performance is comparable or superior to that of conventional flammable carbonate electrolytes. The unusual passivation character of the concentrated electrolyte coupled with its fire-extinguishing property contributes to developing safe and long-lasting batteries, and unlocking the limit toward development of much higher energy-density batteries. Moreover, we found that this concentrated electrolyte potentially enables the battery operation from -20 to 100 °C.

Research Progress Status

29年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

29年度が最終年度であるため、記入しない。

  • Research Products

    (3 results)

All 2017

All Journal Article (2 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 2 results,  Open Access: 2 results) Patent(Industrial Property Rights) (1 results)

  • [Journal Article] Fire-extinguishing organic electrolytes for safe batteries2017

    • Author(s)
      Wang Jianhui、Yamada Yuki、Sodeyama Keitaro、Watanabe Eriko、Takada Koji、Tateyama Yoshitaka、Yamada Atsuo
    • Journal Title

      Nature Energy

      Volume: 3 Pages: 22~29

    • DOI

      10.1038/s41560-017-0033-8

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Unusual Passivation Ability of Superconcentrated Electrolytes toward Hard Carbon Negative Electrodes in Sodium-Ion Batteries2017

    • Author(s)
      Takada Koji、Yamada Yuki、Watanabe Eriko、Wang Jianhui、Sodeyama Keitaro、Tateyama Yoshitaka、Hirata Kazuhisa、Kawase Takeo、Yamada Atsuo
    • Journal Title

      ACS Applied Materials & Interfaces

      Volume: 9 Pages: 33802~33809

    • DOI

      10.1021/acsami.7b08414

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Patent(Industrial Property Rights)] 二次電池用消化性電解液、及び当該電解液を含む二次電池2017

    • Inventor(s)
      山田淳夫、山田裕貴、ワン・ジェンフイ
    • Industrial Property Rights Holder
      国立大学法人東京大学
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      特願2017-215587

URL: 

Published: 2018-12-17  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi