고온에서 H2WO4 코팅된 Li[Ni0.8Co0.15Al0.05]O2의 수명 향상에 관한 연구
- Title
- 고온에서 H2WO4 코팅된 Li[Ni0.8Co0.15Al0.05]O2의 수명 향상에 관한 연구
- Other Titles
- H2WO4-coated Li[Ni0.8Co0.15Al0.05]O2 lithium battery with improved cycling performance at 55 ℃
- Author
- 유태구
- Alternative Author(s)
- Yoo Tae Gu
- Advisor(s)
- 선양국
- Issue Date
- 2015-02
- Publisher
- 한양대학교
- Degree
- Master
- Abstract
- To improve cycling performance of the Li[Ni0.8Co0.15Al0.05]O2 at high temperature (55 ℃), we make homogeneously coated H2WO4 layer on to the surface of Li[Ni0.8Co0.15Al0.05]O2 materials via dry coating method. The morphology of the H2WO4-coated Li[Ni0.8Co0.15Al0.05]O2 was analyzed using scanning electron microscope (SEM) and transmission electron microscopy (TEM) instruments and we found that the surface of the Li[Ni0.8Co0.15Al0.05]O2 was uniformly coated by H2WO4 with a thickness of 10-20nm. At high temperature, the H2WO4-coated Li[Ni0.8Co0.15Al0.05]O2 electrode delivered discharge capacity of 206.4 mAh g-1 while the pristine delivered as slightly lower capacity of 204.5 mAh g-1 and provided a high capacity retention of 90.3% after 100 cycles, compared of 86.1% for pristine. Through the comparison of the impedance results for both pristine and H2WO4-coated Li[Ni0.8Co0.15Al0.05]O2 electrode, both surface (Rsf) and charge transfer (Rct) resistances were reduce by the H2WO4 coating layer. In addition, The H2WO4 coating layer possesses good thermal stability; The pristine shows a relatively large exothermic peak at 221.1 ℃ with a corresponding heat generation of 896.4 J g-1. In the case of the H2WO4-coated Li[Ni0.8Co0.15Al0.05]O2, however, the exothermic peak shifts to more a higher temperature (245.0 ℃) with lower heat generation (509.7 J g-1).
- URI
- https://repository.hanyang.ac.kr/handle/20.500.11754/128885http://hanyang.dcollection.net/common/orgView/200000425987
- Appears in Collections:
- GRADUATE SCHOOL[S](대학원) > ENERGY ENGINEERING(에너지공학과) > Theses (Master)
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