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Ultralow Volume Change of P2‐Type Layered Oxide Cathode for Na‐Ion Batteries with Controlled Phase Transition by Regulating Distribution of Na +
Author(s) -
Liu Zhengbo,
Shen Jiadong,
Feng Shihui,
Huang Yalan,
Wu Duojie,
Li Fangkun,
Zhu Yuanmin,
Gu Meng,
Liu Qi,
Liu Jun,
Zhu Min
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202108109
Subject(s) - ion , cathode , phase transition , materials science , phase (matter) , lattice (music) , oxide , structural stability , chemical physics , analytical chemistry (journal) , chemistry , thermodynamics , physics , metallurgy , organic chemistry , structural engineering , chromatography , acoustics , engineering
Most P2‐type layered oxides exhibit a large volume change when they are charged into high voltage, and it further leads to bad structural stability. In fact, high voltage is not the reason which causes the irreversible phase transition. There are two internal factors which affect structural evolution: the amount and distribution of Na ions retained in the lattice. Hereon, a series of layered oxides Na 2/3 Mn x Ni x −1/3 Co 4/3−2 x O 2 (1/3≤ x ≤2/3) were synthesized. It is observed that different components have different structural evolutions during the charge/discharge processes, and further researches find that the distribution of Na ions in layers is the main factor. By controlling the distribution of Na ions, the phase transition process can be well controlled. As the referential component, P2‐Na 2/3 Mn 1/2 Ni 1/6 Co 1/3 O 2 cathode with uniform distribution of Na ions is cycled at the voltage window of 1.5–4.5 V, which exhibits a volume change as low as 1.9 %. Such a low strain is beneficial for cycling stability. The current work provides a new and effective route to regulate the structural evolution of the promising P2‐type layered cathode for sodium ion batteries.