Details

Autor(en) / Beteiligte

• Tu, Mengyao
• Yu Ruixin Jia, Longbiao
• Kong, Xiangli
• Zhang, Rui
• Xu, Binghui

Titel

Chitosan modulated engineer tin dioxide nanoparticles well dispersed by reduced graphene oxide for high and stable lithium-ion storage

Ist Teil von

• Journal of colloid and interface science, 2023-04, Vol.635, p.105-116

Ort / Verlag

United States: Elsevier Inc

Erscheinungsjahr

2023

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Chitosan (CS) chains are employed to modulate the redox coprecipitation reaction between stannous chloride (SnCl2) and few-layered graphene oxide (GO). CS molecules at first significantly change the surface properties of GO sheets, leading to favorable enlarged distance between GO sheets. Subsequently, these CS molecules are gradually detached from the RGO sheets with the deoxygenation of GO, while SnO2 nanocrystals with controlled size are in-situ anchored on the RGO sheets. [Display omitted] Tin based materials are widely investigated as a potential anode material for lithium-ion batteries. Effectively dispersing SnO2 nanocrystals in carbonaceous supporting skeleton using simplified methods is both promising and challenging. In this work, water soluble chitosan (CS) chains are employed to modulate the redox coprecipitation reaction between stannous chloride (SnCl2) and few-layered graphene oxide (GO), where the excessive restacking of the corresponding reduced graphene oxide sheets (RGO) has been effectively inhibited and the grain size of the in-situ formed SnO2 nanoparticles have been significantly controlled. In particular, the CS molecules are gradually detached from the RGO sheets with the GO deoxygenation process, leaving only a small quantity of CS remnants in the intermediate SnO2@CS@RGO sample. The final SnO2/CSC/RGO sample with significantly improved microstructure is synthesized after a simple thermal treatment, which delivers a high specific capacity of 842.9 mAh g−1 at 1000 mA·g−1 for 1000 cycles in half cells and a specific capacity of 410.5 mAh g−1 at 200 mA·g−1 for 100 cycles in full cells. The reasons for the good lithium-ion storage performances for the SnO2/CSC/RGO composite have been studied.