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Lithium- and oxygen-driven structural evolution in Co-free Li-Mn-rich oxides as cathodes for lithium ion batteries

Hua, Weibo

Abstract (englisch):
Nowadays, the lithium-rich layered 3d-transition-metal (TM) oxides (LLOs) are regarded as one of the most attractive cathode materials for next-generation lithium-ion batteries (LIBs), because they can exhibit a discharge capacity (approaching 300 mAh g-1 at 0.1 C) much higher than that of the currently used materials (~ 180 mAh g-1 at 0.1 C). However, the formation mechanism of LLOs has not been fully understood on a fundamental level yet. One of the most interesting and still open questions is about lithium and oxygen atoms are incorporated into the precursor’s crystal structure during the synthesis of final LLO products. A systematic exploration of this subject was conducted in this PhD work.
In order to obtain the desired LLOs with high performance, it is necessary to design a proper morphology for the precursor which acts as an important source for the high-temperature lithiation reaction. A powerful hydroxide coprecipitation process was employed to synthesize the three dimensional (3D) nanoflower-structured precursor for LLOs.
A combination of thermogravimetric (TG), differential scanning calorimetric (DSC) and in situ high-temperature synchrotron radiation diffraction (SRD) experiments was utilized to investigate the thermally induced structural evolution. ... mehr

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Volltext §
DOI: 10.5445/IR/1000094410
Veröffentlicht am 13.05.2019
Coverbild
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Energiespeichersysteme (IAM-ESS)
Publikationstyp Hochschulschrift
Jahr 2019
Sprache Englisch
Identifikator KITopen-ID: 1000094410
Verlag Karlsruhe
Umfang XXIV, 121 S.
Abschlussart Dissertation
Fakultät Fakultät für Chemie und Biowissenschaften (CHEM-BIO)
Institut Institut für Angewandte Materialien - Energiespeichersysteme (IAM-ESS)
Prüfungsdatum 04.02.2019
Referent/Betreuer Prof. H. Ehrenberg
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
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