TEM-EELS studies of degradation and thermal stability of charged LixNi0.8Co0.15Al0.05O2 cathode materials for lithium ion batteries
- TEM-EELS studies of degradation and thermal stability of charged LixNi0.8Co0.15Al0.05O2 cathode materials for lithium ion batteries
- 황수연; 김동현; 조병원; 정경윤; 이정용; Eric A. Stach; 장원영
- TEM-EELS; thermal stability; cathode; surface structure
- Issue Date
- 한국전기화학회 2013년도 추계 학술발표회 논문집
- Lithium ion batteries (LIBs) have been successfully used in numerous portable electronic devices, and recently have attracted for large scale applications such as electric vehicles (EVs). Ni-based layered cathode materials - for example, LiNi0.8Co0.15Al0.05O2 (NCA) – are considered to be promising materials for EV applications due to their high discharge capacity (~200mAhg-1). However, these materials have significant hurdles that must be overcome in order for the commercialization such as a capacity fade and an impedance rise with electrochemical cycling, as well as poor thermal stability.
In this study, we use transmission electron microscopy (TEM) to investigate the evolution of the surface structure of LixNi0.8Co0.15Al0.05O2 cathode materials as a function of state of charge at room temperature and/or during heating, using a combination of high-resolution electron microscopy (HREM) imaging, selected area electron diffraction (SAED) and electron energy loss spectroscopy (EELS). There have been quite a number of x-ray spectroscopic studies that have investigated the evolution of the average crystallographic structure of the cathode materials as a function of either temperature or degree of delithiation. However, because the degradation of electrode materials and the initiation of thermal runaway may start very locally within electrode materials, a complementary method is required to elucidate how these phenomena occur at the nanoscale. TEM combined with EELS allowed us to gain information regarding both the crystallographic and electronic structure modifications occurring in NCA materials, as well as the morphology of a local area at high spatial resolution. All the details will be available at the meeting.
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