Huang Y.F.,Sun Yat Sen University |
Huang Y.F.,Guangdong Provincial Key Laboratory for High Performance Polymer Based Composites |
Ruan W.H.,Sun Yat Sen University |
Ruan W.H.,Guangdong Provincial Key Laboratory for High Performance Polymer Based Composites |
And 4 more authors.
ACS Applied Materials and Interfaces | Year: 2017
Substituting conventional electrolyte for redox electrolyte has provided a new intriguing method for extending battery life. The efficiency of utilizing the contained redox species (RS) in the redox electrolyte can benefit from increasing the specific surface area of battery electrodes from the electrode side of the electrode-electrolyte interface, but is not limited to that. Herein, a new strategy using nanocomposite electrolyte is proposed to enlarge the interface with the aid of nanoinclusions from the electrolyte side. To do this, graphene oxide (GO) sheets are first dispersed in the electrolyte solution of tungstosilicic salt/ lithium sulfate/poly(vinyl alcohol) (SiWLi/Li2SO4/PVA), and then the sheets are bridged to electrode, after casting and evaporating the solution on the electrode surface. By applying in situ conductive atomic force microscopy and Raman spectra, it is confirmed that the GO sheets doped with RS of SiWLi/Li2SO4 can be bridged and electrically reduced as an extended electrode-electrolyte interface. As a result, the RS-coated GO sheets bridged to LiTi2(PO4)3//LiMn2O4 battery electrodes are found to deliver extra energy capacity (∼30 mAh/g) with excellent electrochemical cycling stability, which successfully extends the battery life by over 50%. © 2016 American Chemical Society.
Hou G.-M.,Sun Yat Sen University |
Hou G.-M.,Guangdong Provincial Key Laboratory for High Performance Polymer Based Composites |
Huang Y.-F.,Sun Yat Sen University |
Huang Y.-F.,Guangdong Provincial Key Laboratory for High Performance Polymer Based Composites |
And 6 more authors.
Journal of Solid State Electrochemistry | Year: 2015
In the developing of wearable electronics and smart textiles, thin, lightweight, and flexible energy storage supercapacitor with high energy density has attracted the attention of many researchers in recent years. In this work, we prepared gel nano-composite electrolyte with the hypergrafted poly (amine-ester) nano-silica (HBPAE-SiO2) as inclusion. The electrochemical properties of the supercapacitor with the alkaline polymer electrolyte were evaluated by cyclic voltammetry, galvanostatic charge–discharge behavior, and electrochemical impedance spectroscopy. It was found that the incorporated HBPAE-SiO2 can greatly increase the specific capacitance of the supercapacitor, which was due to the enhanced ionic conductivity of gel electrolyte as well as good electrode–electrolyte contact. It is pointed out that the electroactivity of the inclusion may be also one reason. The best specific capacitance with 30 wt% HBPAE-SiO2 reached 160 F g−1, which was increased by 36.5 % compared with that of polyvinyl alcohol (PVA)-KOH system. Moreover, the capacity retention of solid-state supercapacitor can be 88 % after 10,000 cycles. The hypergrafted nano-silica modified polymer gel electrolyte is promising for the application of solid-state supercapacitor. © 2015 Springer-Verlag Berlin Heidelberg
Li M.,Sun Yat Sen University |
Li M.,Key Laboratory for Polymeric Composite and Functional Materials |
Li M.,Guangdong Provincial Key Laboratory for High Performance Polymer based Composites |
Li G.,Sun Yat Sen University |
And 14 more authors.
Chinese Journal of Polymer Science (English Edition) | Year: 2015
To enhance the ultraviolet resistance of ZnO based polymer materials, ZnO-supported mesoporous zeolite (M-ZnO) was prepared and characterized by atomic absorption spectroscopy and scanning electron microscopy. The ultraviolet resistance, crystallization behavior and melting characteristics of ZnO and M-ZnO filled PPR composites were compared by FTIR spectra and differential scanning calorimetry. The ultraviolet resistance of M-ZnO filled PPR composites is higher than that of ZnO filled PPR composites, indicating higher ultraviolet resistance of M-ZnO than that of ZnO. The crystallization temperatures of mesoporous zeolite filled PPR were higher than those of M-ZnO and decreased with increasing UV-irradiation time. But the crystallization temperatures of M-ZnO filled PPR composites were not influenced by UV-irradiation time. The ZnO supported on the surface of zeolite is effective in enhancing the ultraviolet resistance of ZnO based polymer materials. © 2015, Chinese Chemical Society, Institute of Chemistry, Chinese Academy of Sciences and Springer-Verlag Berlin Heidelberg.
Hou G.-M.,Sun Yat Sen University |
Hou G.-M.,Guangdong Provincial Key Laboratory for High Performance Polymer based Composites |
Zhang M.-Q.,Sun Yat Sen University |
Zhang M.-Q.,Guangdong Provincial Key Laboratory for High Performance Polymer based Composites |
And 4 more authors.
RSC Advances | Year: 2016
This paper has reported a new polymer nanocomposite of nano-titanium dioxide/polyethylene oxide (TiO2/PEO) incorporated with in situ synthesized hyper-branched poly(amine-ester) (HBPAE) and its application as a polymer electrolyte. Firstly, the HBPAE/HBPAE-g-TiO2/PEO is obtained by synthesizing HBPAE in methyl acrylic acid methyl ester grafted TiO2 (MMA-g-TiO2)/PEO, to simultaneously form the hypergrafted polymer on the nano inclusions (HBPAE-g-TiO2) and hyperbranched particles dispersed in the PEO. Then the Li2SO4 is introduced to prepare the polymer electrolyte, and the relevant structure and properties are studied. It is found that the incorporation of HBPAE into TiO2/PEO can benefit the ionic transportation of the composite electrolyte, and can bridge the nano inclusions which further improves ionic conductivity. The best ionic conductivity of the HBPAE/HBPAE-g-TiO2/PEO polymer electrolyte with 15 wt% TiO2 content can reach as high as 3.2 mS cm-1, which is ∼10 times of that of the PEO electrolyte and ∼28% of that of the HBPAE-g-TiO2/PEO electrolyte without homopolymer component. Furthermore, the optimized polymer electrolyte is assembled into a LiTi2(PO4)3//LiMn2O4 lithium-ion battery, with better excellent cell performance compared with the PEO electrolyte. This study shows that the new polymer nanocomposite has great potential for the assembly of high performance solid electrochemical devices. © 2016 The Royal Society of Chemistry.