Enhancement of energy density of electrochemical capacitors using porous carbon

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DOI[10.20569/00006018]to the data of the same series

Enhancement of energy density of electrochemical capacitors using porous carbon

Persistent ID (NDL): info:ndljp/pid/12303956

Material type: 博士論文

Author: 江口, 卓弥ほか

Publisher: 秋田大学

Publication date: 2022-03-22

Material Format: Digital

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Name of awarding university/degree: 秋田大学,博士（工学）

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Note (General)：: Electric double layer capacitors (EDLCs) are superior to other energy storage devices in terms of power density and lifetime. Li-ion capacitor (LIC), ...

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Material Type: 博士論文
Title: Enhancement of energy density of electrochemical capacitors using porous carbon
Author/Editor: 江口, 卓弥
EGUCHI, Takuya
Author Heading: 江口, 卓弥
EGUCHI, Takuya
Publication, Distribution, etc.: 秋田大学
Publication Date: 2022-03-22
Publication Date (W3CDTF): 2022-03-22
Alternative Title: 多孔質炭素を用いた電気化学キャパシタの高エネルギー密度化
Degree grantor/type: 秋田大学
Date Granted: 2022-03-22
Date Granted (W3CDTF): 2022-03-22
Dissertation Number: 甲第1435号
Degree Type: 博士（工学）
Conferring No. (Dissertation): 甲第1435号
Text Language Code: eng
Target Audience: 一般
Note (General): Electric double layer capacitors (EDLCs) are superior to other energy storage devices in terms of power density and lifetime. Li-ion capacitor (LIC), which combines the anode of Li ion batteries (LIBs) with the cathode of EDLC, is also a promising energy storage device. LICs can achieve higher energy densities than EDLCs, although its cycle performance is lower than EDLCs. There is a need to increase the energy density of these electrochemical capacitors because it has been one-order lower than that of LIBs. Porous carbons have been used as both the electrodes of EDLCs and as the cathode of LICs, and can be fabricated from a variety of organic materials. This thesis targets on the enhancement of energy density of electrochemical capacitors using porous carbons, as well as new anodic active material of LICs. Activated carbons (ACs) are the active material that can be produced from biomass resources, and various attempts have been made to produce ACs derived from biomass resources. However, there are still many biomass resources that have not been utilized. In Chapter 2, the fabrication of AC derived from unused biomass resources as the electrode active material for high energy density EDLC is described. Next, in Chapter 3, the potential of high-performance AC as the electrode active material of EDLC is described. Finally, in Chapter 4, enhancement of energy density of LIC using high-performance AC cathode and Si-based anode is described. Conclusively, ACs derived from organic wastes were shown to be useful as the electrode active materials. It was also exhibited that the particle size of the high specific surface area AC was an important factor affecting the performance of the EDLC, and the high specific surface area AC with optimal particle size for high energy density EDLCs was obtained. A high energy density LIC was realized by matching the operating capacity of the LIC that combines the above high specific surface area AC cathode and Si anode. Owing to the present study, electrochemical capacitors are expected to be used as energy storage devices in various fields because they can overcome the drawback of low energy density. In other words, they can contribute to the development of sustainable society. 電気⼆重層キャパシタ（EDLC）は、他の蓄電デバイスよりも出⼒密度や寿命の点で優れている。また、Li イオン電池（LIB）の負極とEDLCの正極を組み合わせたリチウムイオンキャパシタ（LIC）は、有望なエネルギー貯蔵デバイスとして期待されている。LIC は、EDLC よりも⾼いエネルギー密度を実現できるが、サイクル性能はEDLC よりも低い。これら電気化学キャパシタのエネルギー密度は、LIB に⽐べて⼀桁低いため、より⾼いエネルギー密度が求められている。多孔質炭素は、EDLC の電極やLIC の正極として⽤いられており、様々な有機材料から作製することが可能である。本論⽂では、多孔質炭素を⽤いた電気化学キャパシタのエネルギー密度の向上と、LIC の新しいアノード活物質を対象としている。多孔質炭素である活性炭はバイオマス資源から製造可能な活物質であり、バイオマス資源由来の活性炭の製造は様々な試みがなされている。しかし、まだ利⽤されていないバイオマス資源が多く存在する。第2 章では、⾼エネルギー密度EDLC のための電極活物質としての未利⽤バイオマス資源由来活性炭の製造について述べる。次に第3 章では，⾼性能活性炭のEDLC の電極活物質としての可能性について述べる。最後に第4 章では、 LIC の⾼エネルギー密度化について述べる。結論として、有機廃棄物由来の多孔質炭素は、電極活物質として有⽤であることが⽰された。また，⾼⽐表⾯積活性炭の粒⼦径がEDLC の性能に影響を与える重要な因⼦であることが⽰され，⾼エネルギー密度EDLC に最適な粒⼦径の⾼⽐表⾯積活性炭が得られた。その⾼⽐表⾯積活性炭正極とSi 負極を組み合わせたLIC の動作容量を⼀致させることで、⾼エネルギー密度LIC を実現した。本研究により、電気化学キャパシタは、エネルギー密度が低いという⽋点を克服できるため、様々な分野でのエネルギー貯蔵デバイスとしての利⽤が期待でき、持続可能な社会の発展に寄与する。
DOI: 10.20569/00006018
https://doi.org/10.20569/00006018
Persistent ID (NDL): info:ndljp/pid/12303956
https://dl.ndl.go.jp/pid/12303956
Collection: 障害者向け資料
Collection (Materials For Handicapped People:1): テキストデータ
Collection (particular): 国立国会図書館デジタルコレクション > デジタル化資料 > 博士論文
https://dl.ndl.go.jp/collections/A00014
Acquisition Basis: 博士論文（自動収集）
Date Accepted (W3CDTF): 2022-07-05T02:30:21+09:00
Date Created (W3CDTF): 2022-06-16
Format (IMT): PDF
Access Restrictions: 国立国会図書館内限定公開
Service for the Digitized Contents Transmission Service: 図書館・個人送信対象外
Availability of remote photoduplication service: 可
Periodical Title (URI): http://dx.doi.org/10.20569/00006018
http://hdl.handle.net/10295/00006018
Data Provider (Database): 国立国会図書館 : 国立国会図書館デジタルコレクション
https://dl.ndl.go.jp