Is rice-husk-derived charcoal a promising active material on Li-ion battery anodes?

• Project/Area Number: 21K21330
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 1101:Environmental analyses and evaluation, environmental conservation measure and related fields
• Research Institution: Akita University
• Principal Investigator: ABE Yusuke 秋田大学, 電動化システム共同研究センター, 特任助教 (60908953)
• Project Period (FY): 2021-08-30 – 2023-03-31
• Project Status: Completed (Fiscal Year 2022)
• Budget Amount: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000); Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
• Keywords: 二次電池 / Liイオン電池 / 負極 / 活物質 / もみ殻 / 炭化物 / リチウムイオン電池 / 酸化ケイ素 / 蓄電デバイス / 負極活物質 / バイオマス

Outline of Research at the Start

もみ殻を不活性雰囲気下で加熱処理して得られる炭化物は非晶質な炭素と酸化ケイ素で構成される。本研究では，もみ殻炭化物に含まれる酸化ケイ素を水酸化ナトリウム水溶液に浸漬させることで部分的に除去，およびLiイオン電池組立前にもみ殻炭化物の負極に不可逆容量を低減するLiドープを行う。水酸化ナトリウム水溶液への浸漬条件，およびもみ殻炭化物の負極へのLiドープ条件を多様に変化させ，Liイオン電池の優れた充放電特性を引き出せる条件を探索し，もみ殻炭化物はLiイオン電池用負極活物質として有望か見極める。

Outline of Final Research Achievements

Rice-husk-derived carbonized products containing amorphous C and silicon oxides (SiOx) can be produced by heating a rice husk under nitrogen gas conditions. In this work, the anodic performance of the rice-husk-derived C/SiOx and its possibility of applications were investigated by demonstrating performance evaluations with the various SiOx contents and the Li doping to the anodes. The role of SiOx contents on charging-discharging performances in Li-ion batteries using rice-husk-derived C/SiOx was clarified. I found that successful application of the rice-husk-derived C/SiOx on Li-ion battery anodes, which was achieved by producing C/SiOx with 4.8-44.6 mass% SiOx and adapting Li dopant prior to the cell assembly.

Academic Significance and Societal Importance of the Research Achievements

携帯型電子機器，電気自動車，再生可能エネルギー発電の貯蔵設備などにおける，Liイオン電池の利用意義は高い。それら用途でLiイオン電池の需要は増加し続け，Liイオン電池および電極の生産のためには大量の電極材料が必要となる。本研究では，もみ殻から炭化物を生成し，その物性および電気化学特性を明らかにし，Liイオン電池負極活物質として応用可能であることを示した。Liイオン電池のさらなる需要が見込まれる状況において，もみ殻をその原料として提供できる可能性を示した本研究は社会的意義も大きく，さらにもみ殻炭化物のLiイオン電池負極活物質用途としての特性解明は学術的に大きく貢献した。

Research Products

• [Journal Article] Effects of Excessive Prelithiation on Full-Cell Performance of Li-Ion Batteries with a Hard-Carbon/Nanosized-Si Composite Anode (2022)
  • Author(s): Abe Yusuke、Saito Ippei、Tomioka Masahiro、Kabir Mahmudul、Kumagai Seiji
  • Journal Title: Batteries Volume: 8 Issue: 11 Pages: 210-210
  • DOI: 10.3390/batteries8110210
  • Peer Reviewed / Open Access
• [Journal Article] Role of SiOx in rice-husk-derived anodes for Li-ion batteries (2022)
  • Author(s): Yusuke Abe, Masahiro Tomioka, Mahmudul Kabir, Seiji Kumagai
  • Journal Title: Scientific Reports Volume: 12 Issue: 1 Pages: 975-975
  • DOI: 10.1038/s41598-022-04979-5
  • Peer Reviewed / Open Access
• [Journal Article] もみ殻由来C/SiOx負極を用いるリチウムイオン電池 (2022)
  • Author(s): 安部勇輔，熊谷誠治
  • Journal Title: アグリバイオ Volume: 6 Pages: 73-77
• [Presentation] Rice Husk as a Worthful Source of Battery Materials for High-performance Li-ion Battery Anodes (2022)
  • Author(s): Yusuke Abe, Masaki Nemoto, Masahiro Tomioka, Seiji Kumagai
  • Organizer: The 9th International Conference of Materials Engineering for Resources
  • Int'l Joint Research