Local degradation and thermal stability of charged LixNiyMnzCo1-y-zO2 cathode materials for Lithium ion batteries studied by TEM-EELS
- Local degradation and thermal stability of charged LixNiyMnzCo1-y-zO2 cathode materials for Lithium ion batteries studied by TEM-EELS
- 황수연; 김세영; 김승민; 박성민; 조병원; 정경윤; 이정용; Eric A. Stach; 장원영
- thermal stability; cathode; Li-ion batteries; TEM-EELS
- Issue Date
- 한국전기화학회 2014년도 추계 학술발표회 논문집
- We present here a systematic study on the evolution of the surface structure of
charged LixNiyMnzCo1-y-zO2 (NMC) cathode materials during heating, using a combination
of high-resolution electron microscopy (HREM) imaging, selected area electron diffraction
(SAED) and electron energy loss spectroscopy (EELS). Controlling a ratio among
transition metals of NMC cathode materials significantly affects electrochemical properties
as well as thermal stability. In general, it was reported that high Ni content in the NMC
contributes to a higher capacity at the expense of safety; high Mn content enhances the
structural stability with the sacrifice of capacity and high Co content improves the rate
performances. However, deeper understanding on the relationship between both
crystallographic and electronic structures and thermal – and electrochemical stabilities of
the NMC materials are still required in order to develop safe battery with high performance for the practical applications. In this study, we take advantage of real time electron microscopy to directly investigate the process of thermal decomposition as it occurs at the surface of NMC cathode materials with several different compositions (NMC; 433, 622 and 811) that have been charged to different state of charge (SOC). All the details will be available at the meeting.
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