(A) study on energy storage devices based on binder-free and hierarchical/core-shell-like architectured electrode materials for practical applications
저자
발행사항
용인 : 경희대학교 대학원, 2020
학위논문사항
학위논문(박사)-- 경희대학교 대학원 : 전자공학과 2020.8
발행연도
2020
작성언어
영어
DDC
621 판사항(20)
발행국(도시)
경기도
형태사항
ix, 106 p. : 삽화, 도표 ; 26 cm
일반주기명
경희대학교 논문은 저작권에 의해 보호받습니다.
지도교수: JAE SU YU
참고문헌: p. 98-99
UCI식별코드
I804:11006-200000321640
소장기관
Emerging new trends in modern consumer electronics have stimulated the researchers to develop alternative, sustainable, economically-viable, and high-performance energy storage systems to mitigate the reliance on conventional energy resources. Particularly, rechargeable batteries and supercapacitors (SCs) have been garnered a substantial attraction among the developed energy storage technologies. The rechargeable batteries demonstrate high capacity and energy density properties owing to the Faradaic charge storage mechanism. Whereas, the SCs exhibit high power density, prolonged lifetime, and rapid charge-discharge ability due to the surface-controlled reaction mechanism. Though the charge storage mechanism is different in these two energy technologies, some common factors such as electrode material and its contact with the current collector, chemical composition, morphology, and preparation methods play a vital role in their energy storage performance. Especially, electrode materials are the main and common factors in attaining the high energy storage performance. Accordingly, the research community has been focusing on the development of versatile electrode materials with enriched redox activity, high electrochemical conductivity, multi-valence states, and good structural stability. Besides the electrode materials, their preparation methods affect the large-scale production and cost of the device fabrication. Therefore, a simple and cost-effective preparation methods need to be developed to ease the abovementioned issues. Employing such simple and economically-viable methods, designing the nanoarchitectures with benefit-enriched characteristics of high surface area, porosity, hierarchical connection, and core-shell-like configuration would be a promising approach.
In this thesis, we prepared highly redox-active electrode materials with beneficial morphologies using facile synthesis routes in the absence of non-conductive polymer binders and employed them as electrode materials in rechargeable batteries and SCs. As is well known that the usage of non-conductive binders affects the electrochemical performance and it causes a “dead-mass” in the total mass of active material. Therefore, preparing the electrode materials directly on the surface of current collectors would be a promising strategy in achieving the enhanced performance. Accordingly, we employed simple and cost-effective solution-processing methods to fabricate the binder-free electrode materials. As a result, the production cost of wearable/portable electronics that incorporated with energy storage devices could greatly be reduced. On the other hand, the beneficial features of morphologies such as hierarchical connection and/or core-shell-like configuration have garnered significant interest. Because, the hierarchical connection of nanostructures empowers the rapid charge transportation, which leads to low charge transfer resistance. Whereas, the core-shell-like configuration endows the improved active sites and electrochemical conductivity to an entire composite material.
Considering all the above factors, chapter 3 describes the fabrication of nickel-cobalt layered double hydroxide material on the high conductive silver nanowires decorated carbon cloth (NC LDH@Ag@CC) using a facile electrodeposition technique at room temperature (RT). The Ag NWs that are decorated on the CC (Ag@CC) by a facile dip-coating method substantially improved the hydrophilic nature of bare CC. As a result, the loaded mass of NC LDH@Ag@CC was relatively higher than that of NC LDHs on bare CC (NC LDH@CC). The obtained morphology of NC LDH@Ag@CC is similar to core-shell-like architecture, in which, the core-like Ag NWs are served as conductive skeletons to transfer the charge from active material to the load. Whereas, the shell-like NC LDH nanosheets with hierarchical connection and high surface area perform numerous redox reactions with electrolyte ions. Owing to the core-shell-like architecture and improved active material mass, the NC LDH@Ag@CC electrode demonstrated higher electrochemical properties to the NC LDH@CC and Ag@CC electrodes. To demonstrate the practical applicability, the hybrid SC (HSC) was assembled with NC LDH@Ag@CC as positive and activated carbon coated CC (AC@CC) as negative electrodes, respectively. The fabricated HSC device also exhibited superior energy storage performance along with good cycling stability. Besides, the stable performance of HSC was investigated even under different flexed conditions.
Chapter 4 introduces a novel hot-water therapy (HWT) method for the growth of ternary LDH nanosheets on the surface of conductive fabric (CF). The proposed HWT method provides the selective growth of nanostructures with hierarchical connection and open-porous properties. Moreover, no chemicals are used in the growth of electrode material, which specifies the eco-friendly and cost-effective features. In addition, the HWT method is a simple and scalable process in the fabrication of large-scale electrodes and exploring the novel active materials. In the HWT method, de-ionized water (DIW) exhibits a significant role in the synthesis of Ni-Cu-Co LDH NSs from the CF substrate without employing any raw chemicals. The impact of DIW on the growth of LDH NSs is extensively elaborated in this chapter. The prepared Ni-Cu-Co LDH NSs/CF sample is directly employed as the cathode in the fabrication of flexible HSC. The fabricated HSC demonstrated a decent energy storage performance by exploiting the structural and morphological properties of the Ni-Cu-Co LDH NSs. Furthermore, practical applications are also demonstrated by harvesting solar energy, thereby switching the electronic components
Inspiring from the constructive features of metal-organic frameworks (MOFs) and good electrochemical activity of metal vanadates, Chapter 5 introduces simplistic wet-chemical methods to prepare metal vanadate-based core-shell-like nanoarchitecture. Utilizing Cu(OH)2 nanorod arrays (CH NRAs), which are in-situ grown on copper foam as conductive skeletons, the MOF particles are decorated over their surface. To further improve the electrochemical activity, the vanadium ions are incorporated with these CH NRAs as well as MOF particles by performing the vanadium exchange reactions. All the above procedures are implemented at RT. To improve the crystallinity, the entire composite is carried out to thermal treatment in the inert medium. The resulted metal vanadate composite, i.e., CuV2O6 and Co3V2O8 (CuV-CoV) in the form of core-shell-like architecture demonstrated superior electrochemical performance in lithium (Li)-ion battery (LIB)- as well as SC-study. The metal vanadates in the LIB-study exhibited superior capacity and cycling performance to the metal oxides due to the incorporation of metal ions in host vanadium oxide. In SC-study, the CuV-CoV composite material also demonstrated a fine electrochemical property. Furthermore, the porous carbon is derived from the MOF particles, which can be employed as a negative electrode material in SCs. The HSC is constructed with CuV-CoV as a positive electrode and the porous carbon derived from the MOF particles as negative electrode materials. The fabricated HSC delivered superior energy storage performance. Besides, the real-time applicability of HSC is also explored by successfully harvesting the dynamic energy of a bicycle in the form of an electric energy with the aid of a DC generator. The practical viability of HSC is also investigated by switching/powering the various electronic components.
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