화학공학소재연구정보센터
학회 한국화학공학회
학술대회 2019년 봄 (04/24 ~ 04/26, 제주국제컨벤션센터)
권호 25권 1호, p.481
발표분야 에너지 환경(Energy and Environment)
제목 Compositionally and structurally redesigned High Nickel hybrid cathode for lithium batteries
초록 A hybrid cathode, Li[Ni0.886Co0.049Mn0.050Al0.015]O2, consisting of a core of Li[Ni0.934Co0.043Al0.015]O2 encapsulated by Li[Ni0.844Co0.061Mn0.080Al0.015]O2 is prepared. This core/shell-type structure combining a Ni-enriched Li[NixCoyAl1-x-y]O2 (NCA) cathode with an Al-doped Li[NixCoyMn1-x-y]O2 (NCM) cathode provides an exceptionally high discharge capacity of 225 mAh g-1 at 4.3 V and 236 mAh g-1 at 4.5 V. The hybrid cathode also exhibits microstructural attributes that are beneficial to long-term cycling stability, namely, spatially correlated peripheral primary particles that are crystallographically textured to expedite Li intercalation and nano-sized core primary particles retard the propagation of interparticle microcracks. In addition, ordered intermixing of Li and transition metal ions is observed in the cycled hybrid cathode. This cation ordering stabilizes the host structure during cycling and facilitates Li intercalation. These structural features allow the hybrid cathode to retain 91% of its initial capacity after 1000 cycles, which easily surpasses the performance of currently available cathodes.
저자 김운혁, 선양국
소속 한양대
키워드 에너지 환경
E-Mail yksun@hanyang.ac.kr
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