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 journalArticlepeer-review

19 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

Bibliographical note

Funding Information:
This work was supported by the R&D Program of National Research Council of Science & Technology (project no. CAP-14-2-KITECH ). This work was also supported by the National Research Foundation ( NRF-2018R1A5A1025594 ) of the Ministry of Science and ICT and by the Korea Institute of Energy Technology Evaluation and Planning (Project No. 20172420108680 ) of Ministry of Trade, Industry and Energy, Republic of Korea .

Funding Information:
This work was supported by the R&D Program of National Research Council of Science & Technology (project no. CAP-14-2-KITECH). This work was also supported by the National Research Foundation (NRF-2018R1A5A1025594) of the Ministry of Science and ICT and by the Korea Institute of Energy Technology Evaluation and Planning (Project No. 20172420108680) of Ministry of Trade, Industry and Energy, Republic of Korea.

Publisher Copyright:
© 2019 Elsevier Ltd and Techna Group S.r.l.

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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