Morphology-Controlled WO3 and WS2 Nanocrystals for Improved Cycling Performance of Lithium Ion Batteries
- 주제(키워드) Lithium Ion Batteries
- 발행기관 고려대학교 대학원
- 지도교수 박정희
- 발행년도 2019
- 학위수여년월 2019. 8
- 유형 Text
- 학위구분 석사
- 학과 대학원 신소재화학과
- 원문페이지 33 p
- 실제URI http://www.dcollection.net/handler/korea/000000084800
- UCI I804:11009-000000084800
- DOI 10.23186/korea.000000084800.11009.0000933
- 본문언어 영어
- 제출원본 000046007161
초록/요약
As a promising candidate for anode materials in lithium ion battery (LIB), tungsten trioxide (WO3) and tungsten disulfide (WS2) nanocrystals were synthesized, and their electrochemical properties were comprehensibly studied using a half cell.One-dimensional WO3 nanowires with uniform diameter of 10 nm were synthesized by hydrothermal method, and two-dimensional (2D) WS2nanosheetsby unique gasphase sulfurization of WO3 using H2S. WS2 nanosheets exhibits uniformly 10 nm thickness. TheWO3nanowiresand WS2 nanosheets showedmaximum capacities of 552and 633 mA h g-1, respectively, after 100 cycles. Especially, the capacity of WS2is significantly larger than the theoretical capacity (433 mA hg-1).We also examined the cycling performance using a larger size WO3 and WS2nanocrystals, showing that the smaller size plays an important role in enhancing the capacity of LIBs. The larger capacity of WS2 nanosheets than the theoretical value is ascribed to the lower chargetransfer resistance of2D nanostructures. Key word:Tungsten oxide, Tungsten sulfide, Nanocrystals, Gas phase sulfurization, Lithium ion battery.
more목차
1. Introduction ····················································2
2. Experimental Section ···································3
3. Results and Discussion ·······························6
4. Conclusions ················································17
5. References ····················································18
6. Supporting Information ·····························22
