Electronic structural studies on the improved thermal stability of Li(Ni0.8Co0.15Al0.05)O2 by ZrO2 coating for lithium ion batteries
| Autor: | Wonyoung Chang, Kyung Yoon Chung, Jiyoung Kim, Kyung-Wan Nam, Sang Hoon Kim, Xiao-Qing Yang, Won-Sub Yoon, Dong-Hyun Kim, Se Young Kim, Byung Won Cho, Dieky Susanto, Seong-Min Bak |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
X-ray absorption spectroscopy
Materials science Absorption spectroscopy General Chemical Engineering Analytical chemistry 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Cathode 0104 chemical sciences law.invention Coating law Oxidation state Electrode Materials Chemistry engineering Thermal stability 0210 nano-technology |
| Zdroj: | Journal of Applied Electrochemistry. 47:565-572 |
| ISSN: | 1572-8838 0021-891X |
| DOI: | 10.1007/s10800-017-1062-5 |
| Popis: | The electronic structures of bare and ZrO2-coated Li(Ni0.8Co0.15Al0.05)O2 electrode systems were investigated using a combination of time-resolved X-ray diffraction and soft X-ray absorption spectroscopy (XAS) techniques. The ZrO2 coating on the surface of Li(Ni0.8Co0.15Al0.05)O2 was effective in elevating the onset temperature of the dissociation of charged Li0.33(Ni0.8Co0.15Al0.05)O2, which will enhance the safety of Li-ion cells. Soft XAS spectra of the Ni LII,III-edge in the partial electron yield mode were obtained, which showed that the enhanced electrochemical properties and thermal stability of the cathode materials by ZrO2 coating can be attributed to the suppression of unwanted Ni oxidation state changes at the surface. The electronic structural effects of a ZrO2 coating on Li(Ni0.8Co0.15Al0.05)O2 were examined by soft X-ray absorption spectroscopy. The coating stabilized the Ni oxidation state at the electrode surface against decomposition |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|