Germanium Nanograin Decoration on Carbon Shell: Boosting Lithium‐Storage Properties of Silicon Nanoparticles. (14th September 2016)

• Record Type: Journal Article
• Authors: Luo, Wei; Shen, Dengke; Zhang, Renyuan; Zhang, Binwei; Wang, Yunxiao; Dou, Shi Xue; Liu, Hua Kun; Yang, Jianping
• Is Part Of: Advanced functional materials. Volume 26:Number 43(2016)
• Page Start: 7800
• Page End: 7806
• Publication Date: 2016-09-14
• Subjects: core–shell nanoparticles -- germanium decoration -- lithium ion batteries -- silicon nanoparticles -- sol–gel coatings; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.201603335
• Languages: English
• ISSNs: 1616-301X

Abstract

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. Abstract : A facile Ge decoration on Si@C core–shell nanoparticles is developed via a sol–gel method. With this optimal design, Si@C@Ge core–satellite nanoparticles are expected to exhibit significant enhancement in structural stability and electrochemical kinetics, delivering an unprecedented capacity of 1854 mA h g −1 over 150 cycles and an excellent rate capability of 541 mAh g −1 at 10 A g −1 .