Li–Ni-oxide nanoparticle synthesis by induction thermal plasmas

Hirotaka Sone, Shuhei Yoshida, Takuya Kageyama, Manabu Tanaka, Takayuki Watanabe

研究成果: Contribution to journalArticle査読

抄録

Lithium nickel oxide nanoparticles were synthesized by induction thermal plasma. The forming mechanism of the nanoparticle crystal structure was investigated based on nucleation theory and thermodynamic considerations. Synthesized Li–Ni-oxide nanoparticles were nonstoichiometric Li0.4Ni1.6O2 (space group Fm3m) of the Li-deficient system. Stoichiometric LiNiO2 was difficult to synthesize because of its lower thermodynamic stability when compared with NiO in high-temperature region of more than 2248 K. Reactions forming NiO were predominant at temperatures above 2248 K. LiNiO2 forming reactions were unlikely to occur because Li2O was hard to condense onto NiO nuclei above 2248 K. Therefore, nonstoichiometric Li0.4Ni1.6O2 is easily generated. This was because Ni had a stable divalent valence and formed a strong bond with O. The Gibbs free-energy change suggested that the divalent Ni2+ (NiO) is more stable than trivalent Ni3+ (LiNiO2) at temperatures above 2248 K. This study investigated factors affecting the control of Li–Ni-oxide nanoparticles formed in thermal plasma.

本文言語英語
ページ(範囲)78-83
ページ数6
ジャーナルJOURNAL OF CHEMICAL ENGINEERING OF JAPAN
53
2
DOI
出版ステータス出版済み - 2020

All Science Journal Classification (ASJC) codes

  • 化学 (全般)
  • 化学工学(全般)

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