리튬이차전지용 전체 농도 구배형 양극활물질의 조성별 전기화학적 특성 및 열 안정성에 대한 연구
- Title
- 리튬이차전지용 전체 농도 구배형 양극활물질의 조성별 전기화학적 특성 및 열 안정성에 대한 연구
- Other Titles
- Comparison of various full concentration gradient cathode materials for lithium-ion batteries
- Author
- 주진욱
- Alternative Author(s)
- Ju, Jin Wook
- Advisor(s)
- 선양국
- Issue Date
- 2014-02
- Publisher
- 한양대학교
- Degree
- Master
- Abstract
- Li[NixCoyMn1-x-y]O2 cathode materials were synthesized with varying concentration gradients of Ni and Co ions from the particle center to the surface at a fixed Mn concentration, i.e., full concentration gradient (FCG). In particular, the Mn concentration (20, 25, 30, and 33 mol%) was controlled to optimize electrode performance. The average chemical compositions of lithiated products were Li[NixCo0.16Mn0.84-x]O2 (x= 0.51, 0.54, 0.59, and 0.64). These cathode materials with concentration gradients followed the general performance trend of conventional layered materials; an increase in Ni content improved the capacity, whereas a higher amount of Mn delivered better capacity retention and thermal properties at the expense of capacity. As a result, we determined an optimal level of Mn concentration among the tested FCG cathodes, which maximized the discharge capacity of 188 mAh g-1 and had an excellent capacity retention of 96% over 100 cycles operated up to 4.3 V at 25 oC, with a composition of FCG Li[Ni0.59Co0.16Mn0.25]O2.
- URI
- https://repository.hanyang.ac.kr/handle/20.500.11754/131250http://hanyang.dcollection.net/common/orgView/200000423705
- Appears in Collections:
- GRADUATE SCHOOL[S](대학원) > ENERGY ENGINEERING(에너지공학과) > Theses (Master)
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