{
  "abstract": "An uncomplicated modification of a Pechini assisted sol-gel process in water-polyol solutions is proposed for the synthesis of Na-Fe phosphate powders with different Na-ion content as cathode materials for sodium ion batteries (SIBs). Depending on the pH-values, X-ray diffraction detected the formation of Na-poor olivine-like o-NaFePO4 orthorhombic phase and o-FePO4 nanocrystalline structure. The cyclic voltammetry of the SIBs shows reduction peaks at ~2.23 V (x = 1.0) and ~2.12 V (x = 1.2) vs. Na/Na+ for pH < 3, and between 2.8 V - ~3.0 V (x = 1.0) for pH = 5 respectively. For x = 1.2, several redox peaks observed for pH=5 are assigned to a single-phase reaction (at ~2.5 V vs. Na/Na+) and two-phase reactions (at 3.0–3.25 V). Redox peaks above 4.5 V are more likely associated with Fe3+/Fe4+ redox coupling. A good cyclability is observed for the cathodes synthesized at both the pH values even by charging the batteries to the upper cut-off 4.8 V. The Na-cathode materials prepared under milder conditions showed the highest specific capacity of 40 mAhg-1.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": null,
  "author_total": 3,
  "authors": [
    {
      "name": "Lucangelo Dimesso"
    },
    {
      "name": "Lambert Alff"
    },
    {
      "name": "Gennady Cherkashinin"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/9mgfwk5ke1s1f.bib",
  "cited_by": 0,
  "doi": "10.26434/chemrxiv.15010502/v1",
  "fulltext_url": null,
  "id": "9mgfwk5ke1s1f",
  "issns": [],
  "landing_url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv.15010502/v1",
  "language": null,
  "licence": "CC-BY-NC-ND",
  "licence_label": "CC BY-NC-ND",
  "licence_source": "journal",
  "licence_url": "https://creativecommons.org/licenses/by-nc-nd/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "2208|Advancements in Battery Materials"
    ]
  ],
  "openalex": "W7221967593",
  "pdf_url": null,
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-15",
  "publisher": "American Chemical Society (ACS)",
  "ris": "https://research.draconitic.com/paper/9mgfwk5ke1s1f.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:24Z",
      "native_id": "10.26434/chemrxiv.15010502",
      "source": "chemrxiv",
      "url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv.15010502/v1"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "source:chemrxiv",
      "subfield": "general"
    }
  ],
  "title": "Investigation of NaxFePO4 systems prepared by a modified Pechini sol-gel method as possible cathode materials for high voltage Na-ion batteries",
  "title_text": "Investigation of NaxFePO4 systems prepared by a modified Pechini sol-gel method as possible cathode materials for high voltage Na-ion batteries",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:24Z",
  "url": "https://research.draconitic.com/paper/9mgfwk5ke1s1f",
  "venue": "ChemRxiv",
  "versions": []
}