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In situ constructed Ag/C conductive network enhancing the C-rate performance of Si based anode
Shanghai Univ, Res Ctr Nanosci & Nanotechnol, Shanghai 200444, Peoples R China.
Shanghai Univ, Res Ctr Nanosci & Nanotechnol, Shanghai 200444, Peoples R China.
Shanghai Univ, Res Ctr Nanosci & Nanotechnol, Shanghai 200444, Peoples R China.
Shanghai Univ, Res Ctr Nanosci & Nanotechnol, Shanghai 200444, Peoples R China.
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2018 (English)In: Journal of Energy Storage, E-ISSN 2352-152X, Vol. 17, p. 102-108Article in journal (Refereed) Published
Abstract [en]

Poor intrinsic electrical conductivity as well as considerable volume change during lithium alloying/dealloying process has been a critical defect for high theoretical capacity silicon-based anodes. In our work, we demonstrate the synthesis design of multiscale recombined dendritic Si/Ag/C anode for high energy density LIBs via compositing bulky silicon with uniformly distributed Ag NPs, followed by a carbon source PDA (polydopamine) coating step. Here Ag NPs are generated by an in situ redox reaction between Ag+ and PDA, no need for additional reducing agents. According to the characterization analysis, the robust porous Si/Ag/C structure can provide channels for fast Li+ diffusion and electron conduction, promoting the formation of a thinner and more stable SEI film. As a result, the Si/Ag/C composite anode still yields a relatively high residual capacity of 1422.1 mAh g (1) after 100 cycles at 0.2 A g (1). In addition, it remains 633.1 mAh g (1) after 500 cycles at a high current density of 8 A g (1).

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2018. Vol. 17, p. 102-108
Keywords [en]
Silver decoration, In situ reduction, Electron conduction, Anode
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-356623DOI: 10.1016/j.est.2018.02.016ISI: 000432692900010OAI: oai:DiVA.org:uu-356623DiVA, id: diva2:1236527
Available from: 2018-08-02 Created: 2018-08-02 Last updated: 2018-08-02Bibliographically approved

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