고용량 음극의 구조제어 및 표면개질을 통한 리튬이차전지의 성능향상에 관한 연구 = Studies on the structural control and surface modification of high capacity anode for enhancing the performance of lithium secondary batteries

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For over a decade, lithium-ion batteries (LIBs) have been the preferred source of electric power for mobile devices such as digital cameras, smart phones, and laptop computers. This is owing to their high energy density per volume (volumetric) and weight (gravimetric). However, the depletion of petroleum resources coupled with regulations to reduce environmental pollution has created a new demand for large-scale LIBs for electrical vehicles (EVs) and for sustainable energy storage systems (ESSs) to store energy from renewable sources (water, sun, biomass, geothermal, and hydrogen). These large-scale LIBs should ideally exhibit a variety of reversible capacities, cyclabilities, and power capabilities in order to meet this demand. Graphitic carbon has been widely used as a commercial anode material because of its high coulombic effi-ciency and superior cyclability. However, owing to its relatively low theoretical capacity (372 mAh $g^{-1}$), significant efforts have been dedicated to finding high-capacity anode materials that exhibit high efficiencies and long-term stability. Among the various candidate materials, Si and Li metal have been investigated extensively because of those extremely high theoretical capacities (Si: 4200 mAh $g^{-1}$, Li: 3860 mAh $g^{-1}$). The practical use of Si-based anodes is hindered by the fact that the Si particles in the anodes undergo pulverization accompanied by large volume changes (up to 300%) during cycling, resulting in electrically isolated and dead Si anodes. This is accompanied by the continuous growth of a solid electrolyte interphase (SEI) layer on the newly exposed surfaces of the Si anodes owing to electrolyte decomposition. Various nanosized or nanostructured Si materials, whose electrochemical performances are significantly better than those of micron-sized Si materials, have been proposed to address this problem. In particular, nanoscaled Si structures such as nanowires, hollow nanoparticles and nanotubes can eff...
Advisors
Park, Jung-Kiresearcher박정기
Description
한국과학기술원 : 생명화학공학과,
Publisher
한국과학기술원
Issue Date
2014
Identifier
591780/325007  / 020107067
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 생명화학공학과, 2014.8, [ x, 123 p. ]

Keywords

Lithium secondary batteries; 리튬보호막; 다공성나노섬유; 질소도핑탄소; 고용량음극; 리튬이차전지; High capacity anode; Nitrogen-doped carbon; Porous nanofiber; Li protective layer

URI
http://hdl.handle.net/10203/196406
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=591780&flag=dissertation
Appears in Collection
CBE-Theses_Ph.D.(박사논문)
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