Journal Article

FZJ-2018-06543

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Monitoring the reaction between lithium manganese spinel and Li2MnO3 during heat treatment using Electron Paramagnetic Resonance (EPR) spectroscopy

Sun, R. (Corresponding author)FZJ*RWTH* ; Jakes, P.FZJ* ; Taranenko, S.FZJ* ; Kungl, H.FZJ* ; Eichel, R.-A.FZJ*RWTH*

2018
Elsevier Science Amsterdam [u.a.]

This record in other databases:    

Please use a persistent id in citations: doi:10.1016/j.ssi.2018.08.012

Abstract: The composition of lithium manganese spinel Li1+xMn2−xO4 (LMO) cathode materials for lithium-ion batteries is very sensitive with respect to temperature conditions during processing. Elevated calcination temperatures promote the formation of Li2MnO3 secondary phase in addition to the spinel phase. Under heat treatments at lower temperature secondary-phase Li2MnO3 can react with the LMO spinel main phase and form a new spinel phase with higher Li-content. This solid state reaction has been observed but its kinetic behavior has not been investigated. An experimental approach to monitor the change of Li2MnO3 amount during heat treatment on lithium manganese spinel materials is addressed by implementing Electron Paramagnetic Resonance (EPR) spectroscopy. It is shown that for materials prepared initially at 1073 K, the reaction occurs from 673 K to 973 K and it is active between interface of spinel and Li2MnO3. The Li2MnO3 amounts after varied heating temperatures and holding times were quantified and analyzed. The reaction kinetics, based on a quantitative analysis of the EPR resonances, are discussed by using pseudofirst-order and second-order rate laws. Detailed data analysis indicates that the reaction follows different kinetics depending on the microstructure of Li2MnO3.

---

Contributing Institute(s):

1. Grundlagen der Elektrochemie (IEK-9)

Research Program(s):

1. 131 - Electrochemical Storage (POF3-131) (POF3-131)
2. HITEC - Helmholtz Interdisciplinary Doctoral Training in Energy and Climate Research (HITEC) (HITEC-20170406) (HITEC-20170406)

Appears in the scientific report 2018

---

Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

---