Structural changes and thermal stability of charged Ni-based layered cathode materials for Li-ion batteries studied by in situ TEM

Title
Structural changes and thermal stability of charged Ni-based layered cathode materials for Li-ion batteries studied by in situ TEM
Authors
장원영박성민조병원정경윤Eric A. Stach
Keywords
thermal stability; charged cathode; in-situ TEM
Issue Date
2011-10
Publisher
220th ECS Meeting
Abstract
Li-ion batteries (LIBs) have been widely considered as attractive energy storage devices for a variety of transportation systems because of their high energy density and power performance. Ni-rich layered cathode materials such as LiNi0.8Co0.15Al0.05O2 are promising candidates to replace LiCoO2, which has suffered from high cost and environmental issues concerning Co. However, LIB cell using LiNi0.8Co0.15Al0.05O2 cathode has shown a significant impedance rise and capacity fade upon aging or cycling at elevated temperatures1,2. Furthermore, it was reported that in highly delithiated states, the reduction of Ni ions during heating releases oxygen that can accelerate thermal runaway of the cell, resulting from reaction with the flammable electrolyte3,4. Although much attention has been paid to this issue, the exact thermal decomposition mechanism of Ni-based layered cathode remains unknown.
URI
http://pubs.kist.re.kr/handle/201004/40455
Appears in Collections:
KIST Publication > Conference Paper
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