Unified understanding and mitigation of detrimental phase transition in cobalt-free LiNiO2

Itsuki Konuma; Naohiro Ikeda; Benoît D.L. Campéon; Hinata Fujimura; Jun Kikkawa; Huu Duc Luong; Yoshitaka Tateyama; Yosuke Ugata; Masao Yonemura; Toru Ishigaki; Taira Aida; Naoaki Yabuuchi

doi:10.1016/j.ensm.2024.103200

論文 Unified understanding and mitigation of detrimental phase transition in cobalt-free LiNiO2

Itsuki Konuma ; Naohiro Ikeda ; Benoît D.L. Campéon ; Hinata Fujimura ; Jun Kikkawa (National Institute for Materials Science) ; Huu Duc Luong (National Institute for Materials Science) ; Yoshitaka Tateyama (National Institute for Materials Science) ; Yosuke Ugata ; Masao Yonemura ; Toru Ishigaki ; Taira Aida ; Naoaki Yabuuchi

Download file (6.91MB)
Download as zip (6.7MB)

コレクション

引用

Itsuki Konuma, Naohiro Ikeda, Benoît D.L. Campéon, Hinata Fujimura, Jun Kikkawa, Huu Duc Luong, Yoshitaka Tateyama, Yosuke Ugata, Masao Yonemura, Toru Ishigaki, Taira Aida, Naoaki Yabuuchi. Unified understanding and mitigation of detrimental phase transition in cobalt-free LiNiO2. Energy Storage Materials. 2024, 66 (), 103200. https://doi.org/10.1016/j.ensm.2024.103200

(BibTeX)

説明:

(abstract)

The origin causing detrimental phase transition in LiNiO2 is discussed through the detailed analysis on LiNiO2 integrated with nanosized Li3PO4, which is derived from a metastable and rocksalt LiNiO2–Li3PO4 solid solution sample. LiNiO2 derived from the metastable rocksalt oxide has approximately 6% anti-site defects between Li and Ni sites, and the particle size growth is suppressed by the presence of uniformly dispersed nanosized Li3PO4. In low crystallinity LiNiO2 with partial structural disordering derived from the rocksalt precursor, the Ni ion migration to tetrahedral sites is effectively suppressed because of repulsive electrostatic interaction from Ni ions located in Li layers. Moreover, on the basis of these findings, non-stoichiometric LiyNiO2 has been directly synthesized without high-energy milling and Li3PO4 integration, and significant improvement of electrode reversibility is achieved for the non-stoichiometric oxide without the addition of non-nickel ions. The unified understanding of deterioration mechanisms for LiNiO2 offers a new criterion to design Co-free LiNiO2 without metal substitution, potentially leading to full utilization of a reversible capacity as layered materials.

権利情報: