Local degradation and thermal stability of charged LixNiyMnzCo1-y-zO2 cathode materials for Lithium ion batteries studied by TEM-EELS

Title
Local degradation and thermal stability of charged LixNiyMnzCo1-y-zO2 cathode materials for Lithium ion batteries studied by TEM-EELS
Authors
황수연김세영김승민박성민조병원정경윤이정용Eric A. Stach장원영
Keywords
thermal stability; cathode; Li-ion batteries; TEM-EELS
Issue Date
2014-11
Publisher
한국전기화학회 2014년도 추계 학술발표회 논문집
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/48609
Appears in Collections:
KIST Publication > Conference Paper
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