Integrated Ni and Li-Rich Layered Oxide Cathode Materials for High Voltage Cycling in Rechargeable Li-Ion Batteries

Yuvashri Jayamkondan, Philipp Adelhelm, Prasant Kumar Nayak

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Although the Ni-rich oxide cathodes possess a high specific capacity above 180 mAh g−1, they suffer from capacity fading upon cycling to above 4.3 V due to their high surface reactivity with the electrolyte, structural layered to rock-salt phase transformation and development of micro-cracks. Herewith, the Ni-rich oxide is integrated with those of Li and Mn-rich oxides and their electrochemical performance is evaluated in Li half-cells: LiNi0.6Mn0.2Co0.2O2 (NMC622), 0.5LiNi0.6Mn0.2Co0.2O2 ⋅ 0.5Li1.2Ni0.16Mn0.56Co0.08O2 (NL5050), and 0.25 LiNi0.6Mn0.2Co0.2O2 ⋅ 0.75 Li1.2Ni0.16Mn0.56Co0.08O2 (NL2575). Interestingly, the resultant integrated 0.5LiNi0.6Mn0.2Co0.2O2 ⋅ 0.5Li1.2Ni0.16Mn0.56Co0.08O2 (NL5050) cathode with an equal molar concentration of Ni and Li-rich oxides exhibits a specific capacity of about 190 mAh g−1 with a capacity retention of 83 % after 100 cycles at 0.1 C rate. On the other hand, the Ni-rich oxide alone although exhibits an initial high specific capacity of 200 mAh g−1, it suffers from a low capacity retention of only 35 % after 100 cycles. Thus, this study clearly indicates the benefits of higher cycling stability that results from the integration of Ni-rich and Li-rich oxide cathodes. Hence, the current work promotes the high voltage cycling of oxides through the optimization of integrated oxide cathodes, which can provide high capacity and long cycle-life for Li-ion batteries.

Original languageEnglish
Article numbere202200786
JournalChemElectroChem
Volume9
Issue number21
DOIs
StatePublished - 15 Nov 2022
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2022 Wiley-VCH GmbH.

Keywords

  • Cathode materials
  • high capacity
  • Li and Mn-rich layered oxide
  • long cycle-life
  • Ni-rich oxide

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