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Integrated Structure of Tin-Based Anodes Enhancing High Power Density and Long Cycle Life for Lithium Ion Batteries
journal contribution
posted on 2020-09-07, 06:03 authored by Lei Chen, Yuehua Weng, Yiming Meng, Fei Dou, Zhongxun An, Pingan Song, Guorong Chen, Dengsong ZhangTin-based
materials have been considered as promising anode materials
due to their advantages including high specific capacity, abundant
resources, and low toxicity. Unfortunately, it has remained an intractable
challenge for reasonable design with improved power density and long-term
cycle performance for Li ion batteries because of the huge irreversible
volume change during the alloying/dealloying process. Herein, an integrated
electrode is designed by in situ growing SnSSe on
the graphene sheet, followed by self-assembly and multiscale coated
with conductive carbonized polyacrylonitrile. Pleasantly, dynamic
evolution of integrated electrode thickness during cycles is in situ monitored by dilatometer, which exhibits effectively
suppression of the thickness change to a low level with great reversibility
(38.2% expansion ratio) compared with the pristine SnSSe electrode
(161.8% expansion ratio) in the first cycle. Moreover, the electrochemical
impedance of the integrated electrode shows a great stability after
500 cycles. As a result, the integrated electrode of SnSSe/GR@C shows
a great rate performance (518.4 mA h g–1 at 5.0
A g–1) and stable cycle life (capacities retention
of 107.1% at 5.0 A g–1 after 850 cycles). This work
offers an innovative strategy for the development of high-performance
tin-based anodes.
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SnSSeconductive carbonized polyacrylonitrileLi ion batteriesvolume changeIntegrated Structure850 cyclesanode materialsgraphene sheetLong Cycle Lifecycle performancetin-based anodesthickness changecycle lifeLithium Ion Batteries Tin-based mat...electrode thicknesscapacities retentionTin-Based Anodes Enhancing High Pow...power density500 cycleselectrochemical impedance
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