| 초록 |
Electrochemical properties and structural and thermal stability of Li[Ni0.65Co0.13Mn0.22]O2 (FCG65), Li[Ni0.75Co0.08Mn0.17]O2 (TSFCG75), and Li[Ni0.85Co0.05Mn0.10]O2 (TSFCG85) with concentration gradients of Ni and Mn were evaluated to comprehensively demonstrate the effectiveness of compositional gradation for a wide range of Ni-rich Li[NixCoyMn1−x−y]O2 (NCM) cathodes. In addition, the highly correlated particle orientation helped to reduce the anisotropic internal strain induced by Li removal/extraction from the Ni-rich NCM cathodes. The accelerated aging test (storing the delithiated cathodes in an electrolyte at elevated temperature) reconfirmed the superior stability of the TSFCG85 cathode compared to the commercial Li[Ni0.82Co0.14Al0.04]O2 cathode, which exhibited fast structural degradation. |
