Study of electrochemical properties and thermal stability of the high-voltage spinel cathode material for lithium-ion accumulators

Study of electrochemical properties and thermal stability of the high-voltage spinel cathode material for lithium-ion accumulators

WoS Article

This article deals with the properties of high-voltage cathode material LiNi0.5Mn1.5O4 synthesised by a solid-state reactions method. The sample LiNi0.5Mn1.5O4 was synthesised by two steps of annealing process. A number of electrochemical and physical methods were used to analyse the samples. The obtained LiNi0.5Mn1.5O4 powder was characterised by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS) and galvanostatic charge/discharge measurements at different loads and high temperature in lithium-ion cells with metal lithium as a counter electrode. All these analyses were used for confirmation of the structure of the material LiNi0.5Mn1.5O4 and for investigating its electrochemical properties. A special analysis was used for this paper to understand and confirm the function of this type of material. It is called electron paramagnetic resonance (EPR) spectroscopy, which is used in the field of lithium-ion batteries and also which is not common. This analysis is typically used to analyse free radicals. It is possible to study changes of valence in cathode materials during charging and confirming the valence change of Mn from Mn3+ to Mn4+ and of Ni from Ni2+ to Ni3+ and then to Ni4+ with EPR analysis. Thermogravimetric (TG) analysis of stability of the material LiNi0.5Mn1.5O4 with in situ observation of structural changes by SEM was used as the last analysis.

This article deals with the properties of high-voltage cathode material LiNi0.5Mn1.5O4 synthesised by a solid-state reactions method. The sample LiNi0.5Mn1.5O4 was synthesised by two steps of annealing process. A number of electrochemical and physical methods were used to analyse the samples. The obtained LiNi0.5Mn1.5O4 powder was characterised by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS) and galvanostatic charge/discharge measurements at different loads and high temperature in lithium-ion cells with metal lithium as a counter electrode. All these analyses were used for confirmation of the structure of the material LiNi0.5Mn1.5O4 and for investigating its electrochemical properties. A special analysis was used for this paper to understand and confirm the function of this type of material. It is called electron paramagnetic resonance (EPR) spectroscopy, which is used in the field of lithium-ion batteries and also which is not common. This analysis is typically used to analyse free radicals. It is possible to study changes of valence in cathode materials during charging and confirming the valence change of Mn from Mn3+ to Mn4+ and of Ni from Ni2+ to Ni3+ and then to Ni4+ with EPR analysis. Thermogravimetric (TG) analysis of stability of the material LiNi0.5Mn1.5O4 with in situ observation of structural changes by SEM was used as the last analysis.

Lithium-ion battery, High-voltage cathode material, Solid-state reactions, EPR spectroscopy, In situ ESEM

Lithium-ion battery, High-voltage cathode material, Solid-state reactions, EPR spectroscopy, In situ ESEM

KAZDA, T.; VONDRÁK, J.; DI NOTO, V.; SEDLAŘÍKOVÁ, M.; ČUDEK, P.; OMELKA, L.; ŠAFAŘÍKOVÁ, L.; KAŠPÁREK, V.

2016

14.02.2015

Springer Berlin Heidelberg

Berlin

1432-8488

JOURNAL OF SOLID STATE ELECTROCHEMISTRY

19

6

Federal Republic of Germany

1579

1590

12

http://link.springer.com/article/10.1007/s10008-015-2772-4?sa_campaign=email/event/articleAuthor/onlineFirst