Calorimetric Studies on Chemically Delithiated LiNi0.4Mn0.4Co0.2O2: Investigation of Phase Transition, Gas Evolution and Enthalpy of Formation

Wenjiao Zhao; Julian Gebauer; Thomas Bergfeldt; Magnus Rohde; Carlos Ziebert; Yong Du; Hans J. Seifert

doi:10.3390/batteries9050275

Batteries (May 2023)

Calorimetric Studies on Chemically Delithiated LiNi0.4Mn0.4Co0.2O2: Investigation of Phase Transition, Gas Evolution and Enthalpy of Formation

Wenjiao Zhao,
Julian Gebauer,
Thomas Bergfeldt,
Magnus Rohde,
Carlos Ziebert,
Yong Du,
Hans J. Seifert

Affiliations

Wenjiao Zhao: Volkswagen AG, 38239 Salzgitter, Germany
Julian Gebauer: Karlsruhe Institute of Technology, Institute of Applied Materials-Applied Materials Physics (IAM-AWP), 76344 Eggenstein-Leopoldshafen, Germany
Thomas Bergfeldt: Karlsruhe Institute of Technology, Institute of Applied Materials-Applied Materials Physics (IAM-AWP), 76344 Eggenstein-Leopoldshafen, Germany
Magnus Rohde: Karlsruhe Institute of Technology, Institute of Applied Materials-Applied Materials Physics (IAM-AWP), 76344 Eggenstein-Leopoldshafen, Germany
Carlos Ziebert: Karlsruhe Institute of Technology, Institute of Applied Materials-Applied Materials Physics (IAM-AWP), 76344 Eggenstein-Leopoldshafen, Germany
Yong Du: State Key Lab of Powder Metallurgy, Central South University, Changsha 410083, China
Hans J. Seifert: Karlsruhe Institute of Technology, Institute of Applied Materials-Applied Materials Physics (IAM-AWP), 76344 Eggenstein-Leopoldshafen, Germany

DOI: https://doi.org/10.3390/batteries9050275
Journal volume & issue: Vol. 9, no. 5
p. 275

Abstract

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Li1.11(Ni0.4Mn0.4Co0.2)O2 powders were chemically delithiated by (NH4)2S2O8 oxidizer to obtain Lix(Ni0.4Mn0.4Co0.2)O2 powders. The thermal behavior of two delithiated specimens, Li0.76Ni0.41Mn0.42Co0.17O2.10 and Li0.48Ni0.38Mn0.46Co0.16O2.07, was studied compared to the pristine specimen. Phase transitions at elevated temperatures were investigated by simultaneous thermal analysis (STA) and the gas evolution accompanying the phase transitions was analyzed by mass spectroscopy and an oxygen detector. The enthalpy of two delithiated samples and a pristine specimen were measured by a high temperature drop solution calorimeter. Based on these results, the enthalpies of formation were calculated.

Published in Batteries

ISSN: 2313-0105 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Production of electric energy or power. Powerplants. Central stations; Technology: Chemical technology: Industrial electrochemistry
Website: http://www.mdpi.com/journal/batteries

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