Electrochemical performances of 0.9Li2MnO3–0.1Li(Mn0.375Ni0.375Co0.25)O2 cathodes: Role of the cycling induced layered to spinel phase transformation
作者： C. Ghanty , R.N. Basu , S.B. Majumder
DOI: 10.1016/J.SSI.2013.12.032
关键词:
摘要: Abstract In the present work, we have reported that as compared to Li2MnO3 lean compositions, electrochemical properties of rich integrated cathodes (viz. 0.9Li2MnO3–0.1Li(Mn0.375Ni0.375Co0.25)O2) are singular in three different ways. First, unlike its counterparts, oxygen and concomitant lithium extraction composition Li(Li0.31Mn0.646Ni0.026Co0.017)O2) continues beyond first charging cycle. Second, for layered spinel phase transformation seems be unavoidable with repeated charge–discharge cycling. Formation triggers capacity fading these cathodes. We found cathodes, galvanostatic cycling at relatively higher rate (> 20 mA g− 1) retards formation improvement retention Finally, major contribution is due reversible manganese redox (~ 3 V ~ 2.6 V). Therefore, energy densities less compositions.
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