Reaching Highly Stable Specific Capacity with Integrated 0.6Li2MnO3: 0.4LiNi0.6Co0.2Mn0.2O2 Cathode Materials

Tirupathi Rao Penki, Prasant Kumar Nayak, Elena Levi, Judith Grinblat, Yuval Elias, Shalom Luski, Boris Markovsky, Doron Aurbach

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

The work described herein was performed to find guidelines for the optimal selection of high-specific-capacity cathode materials for Li-ion batteries. In this study, we compared the electrochemical behavior of three cathode materials working over wide potential domains in Li cells: Li1.2Ni0.24Co0.08Mn0.48O2 (0.6Li2MnO3 : 0.4LiNi0.6Co0.2Mn0.2O2), Li1.2Ni0.16Co0.08Mn0.56O2 (0.6Li2MnO3 : 0.4LiNi0.4Co0.2Mn0.4O2), and LiNi0.6Co0.2Mn0.2O2 (as a reference material). The first two compositions are Li- and Mn-rich cathode materials that contain Li2MnO3 and LiNixCo1-x-yMnyO2 components, as established by structural analysis using X-ray and electron diffraction. The main focus was the possibility to obtain a stable capacity and average voltage while working over a wide potential domain, in order to extract high specific capacity. The three materials were prepared through the self-combustion reaction and were characterized by using SEM, ICP, HRTEM, and electrochemical techniques. Li1.2Ni0.24Co0.08Mn0.48O2 cathodes operating over the potential range 2.0–4.6 V vs. Li demonstrated stable specific capacities greater than 200 mAh g−1 and stable average voltages, thus rivaling LiNi0.6Co0.2Mn0.2O2 and Li1.2Ni0.16Co0.08Mn0.56O2 cathodes in terms of electrochemical performance. The consequences of these findings are discussed herein. Li- and Mn-rich cathode materials may be advantageous compared to Ni-rich cathode materials in terms of cost and safety.

Original languageEnglish
Pages (from-to)1137-1146
Number of pages10
JournalChemElectroChem
Volume5
Issue number8
DOIs
StatePublished - Apr 2018

Bibliographical note

Publisher Copyright:
© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

Keywords

  • Li- and Mn-rich cathodes
  • capacity fading
  • high specific capacity
  • lithium-ion batteries
  • voltage fading

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