Fluorinated Co-Solvents Enable Excellent Performances of Practical Cells Comprising LixSiO-Graphite Composite Anodes and LiNi0.89Co0.05Mn0.05Al0.01O2 (NCMA) Cathodes

Naresh Vangapally, David Lusztig, Suman Rathod, Amreen Bano, Hadar Scalar, Sri Harsha Akella, Malachi Noked, Dan T. Major, Ion C. Halalay, Suresh Sriramulu, Shalom Luski, Doron Aurbach

Research output: Contribution to journalArticlepeer-review

Abstract

Li-ion batteries based on high specific capacity LixSiO-Graphite anodes and LiNi0.89Co0.05 Mn0.05Al0.01O2 (NCMA) cathodes may have numerous practical applications owing to high energy density without a necessary compromise on safety. SiO, which is an attractive Li insertion anode material, offers more cycling stability than Si and a higher capacity than graphite. Therefore, a new trend has emerged for developing composite C-Si anodes, possessing the excellent cyclability of graphite coupled with high capacity SiO. The composite structure described herein prevents the volume expansion of SiO and maintains the structural integrity during prolonged cycling. However, graphite electrodes suffer from exfoliation in propylene carbonate (PC) based electrolyte solutions, which avoids well known safety benefits related to a possible use of PC based electrolyte solutions in all kinds of Li batteries. Herein, it is reported that trifluoro propylene carbonate (TFPC) is compatible with graphite anodes. New electrolyte formulations are developed and tested containing fluorinated co-solvents and compared the performance of several electrolyte solutions, including conventional alkyl carbonates-based solutions in full Li-ion cells, which included LixSiO-Graphite anodes and LiNi0.89Co0.05Mn0.05Al0.01O2 (NCMA) cathodes. Cells with new electrolyte solutions developed herein demonstrated nearly twice capacity retention in prolonged cycling experiments compared to similar reference cells containing conventional electrolyte solutions.

Original languageEnglish
JournalSmall
Early online date25 Jun 2024
StateE-pub ahead of print - 25 Jun 2024

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© 2024 Wiley-VCH GmbH.

Keywords

  • fluorinated solvents
  • LiNiCo MnAlO (NCMA) cathodes
  • non-flammable electrolyte solutions
  • SEI type surface films
  • SiO-Gr composite anodes

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