Mitigating storage-induced degradation of Ni-rich LiNi 0.8 Co 0.1 Mn 0.1 O 2 cathode material by surface tuning with phosphate

Won Gyue Ryu, Hyun Seop Shin, Min Sik Park, Hansung Kim, Kyu Nam Jung, Jong Won Lee

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The Ni-rich LiNi 0.8 Co 0.1 Mn 0.1 O 2 layered oxide (NCM811) is attracting considerable attention as a high-capacity cathode material for rechargeable Li-ion batteries. However, due to its inherent structural/chemical/electrochemical instability, NCM811 with high Ni content suffers from significant performance degradation upon storage even in ambient atmospheres as well as during charge–discharge cycling. Herein, we demonstrate a simple but effective surface-tuning approach to mitigate storage-induced degradation of NCM811, which is based on the conversion of undesirable Li residues to a protective Li 3 PO 4 nanolayer via phosphate treatment. The accelerated storage stability test shows that phosphate-modified NCM811 exhibits remarkably improved electrochemical performance (capacity, cycle life, and rate capability) over the pristine one after being stored under harsh environmental conditions. A combined analytical study indicates that surface tuning through phosphate treatment enhances the storage stability of NCM811 by eliminating impurity-forming Li residues and producing a Li 3 PO 4 nanolayer that inhibits parasitic reactions at the electrode–electrolyte interface. Furthermore, Li 3 PO 4 provides an effective barrier to H 2 O and CO 2 infiltration into the particle agglomerates, thereby suppressing the loss of particle integrity.

Original languageEnglish
Pages (from-to)13942-13950
Number of pages9
JournalCeramics International
Volume45
Issue number11
DOIs
Publication statusPublished - 2019 Aug 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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