Journal Article FZJ-2024-02563

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Revealing the Effect of High Ni Content in Li‐Rich Cathode Materials: Mitigating Voltage Decay or Increasing Intrinsic Reactivity

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2023
Wiley-VCH Weinheim

Small 19(20), 2207328 () [10.1002/smll.202207328]

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Abstract: Li-rich layered oxides are considered as one of the most promising cathode materials for secondary lithium batteries due to their high specific capacities, but the issue of continuous voltage decay during cycling hinders their market entry. Increasing the Ni content in Li-rich materials is assumed to be an effective way to address this issue and attracts recent research interests. However, a high Ni content may induce increased intrinsic reactivity of materials, resulting in severe side reactions with the electrolyte. Thus, a comprehensive study to differentiate the two effects of the Ni content on the cell performance with Li-rich cathode is carried out in this work. Herein, it is demonstrated that a properly dosed amount of Ni can effectively suppress the voltage decay in Li-rich cathodes, while over-loading of Ni, on the contrary, can cause structural instability, Ni dissolution, and nonuniform Li deposition during cycling as well as severe oxygen loss. This work offers a deep understanding on the impacts of Ni content in Li-rich materials, which can be a good guidance for the future design of such cathodes for high energy density lithium batteries.

Classification:

Note: Unterstützt durch DFG, Projekt Li 2916/2-1

Contributing Institute(s):
  1. Helmholtz-Institut Münster Ionenleiter für Energiespeicher (IEK-12)
Research Program(s):
  1. 1221 - Fundamentals and Materials (POF4-122) (POF4-122)

Appears in the scientific report 2024
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Medline ; Creative Commons Attribution-NonCommercial-NoDerivs CC BY-NC-ND 4.0 ; OpenAccess ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Wiley ; Essential Science Indicators ; IF >= 10 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection
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Dokumenttypen > Aufsätze > Zeitschriftenaufsätze
Institutssammlungen > IMD > IMD-4
Workflowsammlungen > Öffentliche Einträge
IEK > IEK-12
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Open Access

 Datensatz erzeugt am 2024-04-10, letzte Änderung am 2025-02-03


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