Study on Enhanced Properties of 343/442/541NCM Cathode Materials Derived from (Na0.25K0.15)Ni2.6-kMnk[Co(CN)6]2 Prussian Blue Analogues for Lithium-ion Batteries.
- Title
- Study on Enhanced Properties of 343/442/541NCM Cathode Materials Derived from (Na0.25K0.15)Ni2.6-kMnk[Co(CN)6]2 Prussian Blue Analogues for Lithium-ion Batteries.
- Other Titles
- 프러시안 블루 아날로그를 통해 합성한 343/442/541 조성의 NCM 리튬이온배터리 양극물질의 향상된 특성에 관한 연구
- Author
- 조성한
- Alternative Author(s)
- Seonghan JO
- Advisor(s)
- 백운규
- Issue Date
- 2020-02
- Publisher
- 한양대학교
- Degree
- Master
- Abstract
- It is technologically important to develop LiNixCoyMnzO2 (NCM) cathode materials for Li-ion batteries with the higher energy density. However, Li+/Ni2+ cation mixing phenomenon is a critical problem and makes Li ion kinetics poor, preventing the commercialization by widening an operating voltage window. Here, we report a new method of LiNixCoyMnzO2 synthesis by using (Na0.25K0.15)Ni2.6-kMnk[Co(CN)6]2 (PBA) and interesting physicochemical aspects for advanced Li-ion batteries. A chemical lithiation process of the PBAs is invented for an alkali metal/transition metal layered structure, which enables an effective transition to the NCM phase at a relatively low calcination temperature. As-prepared NCM retains a LiO2 slab space of 2.637 Å (an ideal value of 2.64 Å). In addition, It shows ~1 at.% of an suppressed Li+/Ni2+ mixing, resulting in a lowered barrier energy of 20–30 meV and an improved reversibility of a and c lattice constant during cycling. In addition, a chemical densification process is developed to sustain well-defined cubic morphology even at a high calcination temperature over 700 ℃. Resultant NCM microcubes demonstrates rate capability and superior cyclability in a broad potential windows of 2.7–4.5 V versus Li/Li+. Our results indicate that an importance of suppressing the Li+/Ni2+ cation mixing in LiNixCoyMnzO2 for a development of Li-ion batteries with the higher energy density.
- URI
- https://repository.hanyang.ac.kr/handle/20.500.11754/123037http://hanyang.dcollection.net/common/orgView/200000437078
- Appears in Collections:
- GRADUATE SCHOOL[S](대학원) > ENERGY ENGINEERING(에너지공학과) > Theses (Master)
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