期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 60, 期 38, 页码 20960-20969出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202108109
关键词
distribution of Na ions; layered oxide cathodes; Na ions retained in lattice; structural evolution; ultralow volume change
资金
- National Natural Science Foundation of China [51771076, NSFC51621001]
- Guangdong Pearl River Talents Plan [2017GC010218]
- RAMP
- D Program in Key Areas of Guangdong Province [2020B0101030005]
- Guangdong Basic and Applied Basic Research Foundation [2020B1515120049]
- Science and Technology Innovation Commission
- Shenzhen-Hong Kong Innovation Circle Category D Project [SGDX 2019081623240948]
Controlled distribution of Na ions can effectively regulate the phase transition process of P2-type layered oxides, reducing volume change to as low as 1.9% and improving cycling stability.
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 Na2/3MnxNix-1/3Co4/3-2xO2 (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-Na2/3Mn1/2Ni1/6Co1/3O2 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.
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