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Unveiling the Unique Phase Transformation Behavior and Sodiation Kinetics of 1D Van der Waals Sb2S3 Anodes for Sodium Ion Batteries

Authors Yao, Shanshan HKUST affiliated (currently or previously)
Cui, Jiang HKUST affiliated (currently or previously)
Lu, Ziheng HKUST affiliated (currently or previously)
Xu, Zhenglong HKUST affiliated (currently or previously)
Qin, Lei HKUST affiliated (currently or previously)
Huang, Jiaqiang HKUST affiliated (currently or previously)
Sadighi, Zoya HKUST affiliated (currently or previously)
Ciucci, Francesco View this author's profile
Kim, Jang Kyo View this author's profile
Issue Date 2017
Source Advanced Energy Materials , v. 7, (8), April 2017, article number 1602149
Summary Carbon-coated van der Waals stacked Sb2S3 nanorods (SSNR/C) are synthesized by facile hydrothermal growth as anodes for sodium ion batteries (SIBs). The sodiation kinetics and phase evolution behavior of the SSNR/C anode during the first and subsequent cycles are unraveled by coupling in situ transmission electron microscopy analysis with first-principles calculations. During the first sodiation process, Na+ ions intercalate into the Sb2S3 crystals with an ultrafast speed of 146 nm sāˆ’1. The resulting amorphous NaxSb2S3 intermediate phases undergo sequential conversion and alloying reactions to form crystalline Na2S, Na3Sb, and minor metallic Sb. Upon desodiation, Na+ ions extract from the nanocrystalline phases to leave behind the fully desodiated Sb2S3 in an amorphous state. Such unique phase evolution behavior gives rise to superb electrochemical performance and leads to an unexpectedly small volume expansion of ā‰ˆ54%. The first-principles calculations reveal distinctive phase evolution arising from the synergy between the extremely low Na+ ion diffusion barrier of 190 meV and the sharply increased electronic conductivity upon the formation of amorphous NaxSb2S3 intermediate phases. These findings highlight an anomalous Na+ ion storage mechanism and shed new light on the development of high performance SIB anodes based on van der Waals crystals.
ISSN 1614-6840
Language English
Format Article
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