Germanium Nanograin Decoration on Carbon Shell: Boosting Lithium‐Storage Properties of Silicon Nanoparticles |
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| Authors: | Wei Luo Dengke Shen Renyuan Zhang Binwei Zhang Yunxiao Wang Shi Xue Dou Hua Kun Liu Jianping Yang |
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| Affiliation: | 1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, P. R. China;2. Department of Chemistry, Northwestern University, Evanston, IL, USA;3. School of Materials Science and Engineering, Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Tongji University, Shanghai, P. R. China;4. Institute for Superconducting and Electronic Materials, Australian Institute of Innovative Materials, University of Wollongong, Innovation Campus, North Wollongong, NSW, Australia |
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| Abstract: | A novel heterostructured Si@C@Ge anode is developed via a two‐step sol–gel method. A facile and straightforward Ge decoration significantly boosts the Li‐storage performance of core–shell Si@C nanoparticles on both mechanics and kinetics. The Si@C@Ge anode shows unprecedented electrochemical performance in terms of accessible capacity, cycling stability, and rate capability when compared to those of a core–shell Si@C anode. Based on the experimental results and analysis of the mechanism, it is evident that high‐conductivity Ge nanograins on the surface facilitates the Li diffusivity and electron transport and guarantees high ion accessibility. Moreover, it is the Ge nanograins that serve as buffering cushion to tolerate the mechanic strain distribution on the electrode during lithiation/delithiation processes. |
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| Keywords: | core– shell nanoparticles germanium decoration lithium ion batteries silicon nanoparticles sol– gel coatings |
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