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Preparation and Characterization of Porous Carbon Nanotubes for High Rate Capability Li-S Batteries
DC Field | Value | Language |
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dc.contributor.advisor | 박종래 | - |
dc.contributor.author | 정요찬 | - |
dc.date.accessioned | 2017-07-14T03:09:20Z | - |
dc.date.available | 2017-07-14T03:09:20Z | - |
dc.date.issued | 2014-08 | - |
dc.identifier.other | 000000021389 | - |
dc.identifier.uri | https://hdl.handle.net/10371/123322 | - |
dc.description | 학위논문 (석사)-- 서울대학교 대학원 : 재료공학부, 2014. 8. 박종래. | - |
dc.description.abstract | Porous carbon nanotubes were prepared by KOH activation and investigated for the application of high performance lithium sulfur batteries. The enhanced specific surface area, increased pore volume and functionalization for the interaction with polysulfide and lithium sulfide were realized on the carbon matrix. The morphological and chemical changes of porous carbon nanotubes were examined with the electrochemical performances.
The effects of the uniformity of sulfur loaded on carbon nanotubes were also investigated in the viewpoint of electrochemistry. Three methods of preparing CNT/sulfur composites were studied. For the result, the uniform distribution of sulfur on the carbon matrix and the best electrochemical performance were obtained with the solution based sulfur precipitation method followed by thermal treatment. Porous CNT/sulfur composite which was activated for 2 hours delivered the highest performance of 688 mAh/g at 5 C and retained 672 mAh/g even after 50 cycles. This outstanding performance was proven to be originated from the shorten electron penetration depth and guaranteed lithium ion diffusion pathway in the composite. | - |
dc.description.tableofcontents | Abstract i
Contents iii List of Tables v List of Figures vi 1. Introduction 1 1.1 General introduction of lithium sulfur batteries (LSBs) 1 1.1.1 Increasing demands on the high energy density batteries 1 1.1.2 Opportunities of LSBs 2 1.1.3 Challenges of LSBs 3 1.2 Current strategies addressing the challenges of LSBs 5 1.2.1 Porous carbon materials 5 1.2.2 Functionalization on carbon materials 7 1.2.3 Insertion of physical barriers 9 1.2.4 Electrolytes 10 1.2.5 Limitations and summary 11 1.3 State of the art on high rate performance 12 1.4 Requirements for the high rate capability 13 1.5 Scope and aim of this study 16 2. Experimental 17 2.1 Reagents and chemicals 17 2.2 Preparation of partially unzipped CNTs (PCNTs) 18 2.3 Preparation of PCNT/sulfur composites 18 2.4 Characterization 19 2.5 Electrochemical experiments 20 3. Results and discussion 21 3.1 Analysis on PCNTs 21 3.1.1 Morphological characteristics 21 3.1.2 Chemical surface characteristics 28 3.2 Study on the effect of uniform sulfur distribution for the preparation of PCNT/sulfur composites 32 3.2.1 Morphological, microstructural and thermal characteristics 32 3.2.2 Electrochemical performance of CNT/sulfur composites depending on the uniformity of sulfur 36 3.3 Analysis on PCNT/sulfur composites 38 3.3.1 Visual investigation on PCNT/sulfur composites 38 3.3.2 Microstructural analysis and thermal stability of PCNT/sulfur composites 40 3.4 Electrochemical performance of PCNT/sulfur composites 43 3.4.1 Cycle performances of PCNT/sulfur composites 43 3.4.2 The effects of material properties on the electrochemical performances 47 3.4.3 The electrochemical impedance spectroscopy analysis of PCNT/sulfur composites 54 3.5 Further works 55 4. Conclusion 56 5. Reference 57 국 문 초 록 60 | - |
dc.format | application/pdf | - |
dc.format.extent | 2749762 bytes | - |
dc.format.medium | application/pdf | - |
dc.language.iso | en | - |
dc.publisher | 서울대학교 대학원 | - |
dc.subject | porous carbon nanotubes | - |
dc.subject | carbon nanotubes | - |
dc.subject | lithium sulfur batteries | - |
dc.subject | high rate capability | - |
dc.subject | high performance batteries | - |
dc.subject | cathode materials | - |
dc.subject.ddc | 620 | - |
dc.title | Preparation and Characterization of Porous Carbon Nanotubes for High Rate Capability Li-S Batteries | - |
dc.type | Thesis | - |
dc.contributor.AlternativeAuthor | Jeong, Yo Chan | - |
dc.description.degree | Master | - |
dc.citation.pages | viii, 61 | - |
dc.contributor.affiliation | 공과대학 재료공학부 | - |
dc.date.awarded | 2014-08 | - |
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