Improved electrochemical performance of LiCoPO4 using eco-friendly aqueous binders

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Abstract

The electrochemical performance of LiCoPO4 (LCP) as a high-voltage positive electrode for lithium-ion batteries is significantly improved by using the aqueous binder sodium carboxymethyl cellulose (CMC). The CMC not only provides a uniform electrode surface as shown by scanning electron microscopy and elemental mapping, but also suppresses the degradation of LiCoPO4 by scavenging HF in the electrolyte solution as demonstrated by FT-IR. In comparison with other water-soluble binders such as sodium alginate (ALG) and polyacrylic acid sodium salt (PAA), the homogeneous distribution of CMC within the electrodes accompanied by high accessibility of carboxylate groups in CMC are shown to be crucial factors to achieve enhanced performance with an excellent capacity retention of 94% after 20 cycles at a rate of C/10.
Original languageEnglish
Pages (from-to)11-19
Number of pages9
JournalJournal of Power Sources
Volume403
Early online date28 Sept 2018
DOIs
Publication statusPublished - 1 Nov 2018

Keywords

  • Lithium ion batteries
  • High-voltage positive electrode materials
  • Aqueous binders
  • LiCoPO4

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