Two-Phase Transition Induced Amorphous Metal Phosphides Enabling Rapid, Reversible Alkali-Metal Ion Storage
- Authors
- Zhou, Limin; Jiao, Peixin; Fang, Liang; Liu, Luojia; Hao, Zhimeng; Wang, Haihua; Kang, Yong-Mook; Zhang, Kai; Chen, Jun
- Issue Date
- 24-8월-2021
- Publisher
- AMER CHEMICAL SOC
- Keywords
- amorphous anode; diffusion kinetics; element segregation; metal phosphides; sodium-ion battery
- Citation
- ACS NANO, v.15, no.8, pp.13486 - 13494
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS NANO
- Volume
- 15
- Number
- 8
- Start Page
- 13486
- End Page
- 13494
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/136815
- DOI
- 10.1021/acsnano.1c04041
- ISSN
- 1936-0851
- Abstract
- Metal phosphides as anode materials for alkali-metal ion batteries have captured considerable interest due to their high theoretical capacities and electronic conductivity. However, they suffer from huge volume expansion and element segregation during repetitive insertion/extraction of guest ions, leading to structure deterioration and rapid capacity decay. Herein, an amorphous Sn0.5Ge0.5P3 was constructed through a two-phase intermediate strategy based on the elemental composition modulation from two crystalline counterparts and applied in alkali-metal ion batteries. Differing from crystalline P-based compounds, the amorphous structure of Sn0.5Ge0.5P3 effectively reduces the volume variation from above 300% to 225% during cycling. The ordered distribution of cations and anions in the short-range ensures the uniform distribution of each element during cycles and thus contributes to durable cycling stability. Moreover, the long-range disordered structure of amorphous material shortens the ion transport distance, which facilitates diffusion kinetics. Benefiting from the aforementioned effects, the amorphous Sn0.5Ge0.5P3 delivers a high Na storage capacity of 1132 mAh g(-1) at 0.1 A g(-1) over 100 cycles. Even at high current densities of 2 and 10 A g(-1), its capacities still reach 666 and 321 mAh g(-1), respectively. As an anode for Li storage, the Sn0.5Ge0.5P3 similarly also exhibits better cycling stability and rate performance compared to its crystalline counterparts. Significantly, the two-phase transition strategy is generally applicable to achieving other amorphous metal phosphides such as GeP2. This work would be helpful for constructing high-performance amorphous anode materials for alkali-metal ion batteries.
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