High-Performance Ag-Doped Na0.67MnO2 Cathode: Operando XRD Study and Full-Cell Performance Analysis with Presodiated Anode

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Altın S., Özgül M., Altundağ S., Altın E.

ACS APPLIED ENERGY MATERIALS, cilt.1, sa.1, ss.1-12, 2023 (SCI-Expanded)

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 1 Sayı: 1
  • Basım Tarihi: 2023
  • Doi Numarası: 10.1021/acsaem.3c02134
  • Dergi Adı: ACS APPLIED ENERGY MATERIALS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Compendex
  • Sayfa Sayıları: ss.1-12
  • İnönü Üniversitesi Adresli: Evet

Özet

The key challenges of Na-ion batteries are to design

structurally stable electrodes and reach high-enough capacities with fullcells.

In this study, we report the positive effects of Ag substitution/addition

to Na0.67MnO2. We determined that some of the intended Ag was

incorporated into the structure, while the rest remained in metallic form. Ag

substitution/addition increases the capacity (208 mA h/g at C/3 rate) and

improves the cycle life of Na0.67MnO2 (42% capacity fade with 100 cycles)

in half-cells. We attribute these results to an enlarged interlayer spacing due

to the large ionic radius of Ag, a suppressed Jahn−Teller effect due to the

reduced number of Mn3+ ions, and an increased electrical conductivity due

to the presence of metallic Ag. We also produced full-cells with an

electrochemically presodiated hard carbon anode. We reached a very high

initial capacity of 190 mA h/g at the C/3 rate, showing that Ag substituted/

added Na0.67MnO2 is a promising candidate for commercialization of Na-ion batteries