Comparison of amorphous, pseudohexagonal and orthorhombic Nb2O5 for high-rate lithium ion insertion. Issue 14 (18th March 2016)

• Record Type: Journal Article
• Authors: Li, Shuang; Xu, Qian; Uchaker, Evan; Cao, Xi; Cao, Guozhong
• Is Part Of: CrystEngComm. Volume 18:Issue 14(2016)
• Page Start: 2532
• Page End: 2540
• Publication Date: 2016-03-18
• Subjects: Crystals -- Periodicals; Crystal growth -- Periodicals; Crystallography -- Periodicals; Cristaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Cristallographie -- Périodiques; 548
• DOI: 10.1039/c5ce02069g
• Languages: English
• ISSNs: 1466-8033

Abstract

Abstract : Amorphous, pseudohexagonal and orthorhombic Nb2 O5 nanoparticles were synthesized by sol–gel process. The material characteristics and electrochemical performance of these polymorphs were compared. Abstract : Amorphous, pseudohexagonal and orthorhombic Nb2 O5 nanoparticles were synthesized using a facile and green sol–gel process followed by thermal treatment at 450 °C, 600 °C and 800 °C for 3 h in air, respectively. The resulting materials have been subjected to a detailed experimental study and comparison of their structural, electrical and electrochemical properties. The experiments have demonstrated that the pseudohexagonal Nb2 O5 (TT-Nb2 O5 ) exhibited higher storage capacity, largely due to its high specific surface area and small crystallites, and better cycling performance than both amorphous Nb2 O5 (a-Nb2 O5 ) and orthorhombic Nb2 O5 (T-Nb2 O5 ); such experimental findings were found to be associated with and thus ascribed to the lower charge transfer resistance and higher lithium ion diffusion coefficient of TT-Nb2 O5 than those of a-Nb2 O5 and T-Nb2 O5 . This research contributes to a better fundamental understanding of the relationship between the crystal structure and the crystallinity and electrochemical properties, particularly Li-ion storage properties, and leads to a possible new advancement in the research field of lithium ion batteries and pseudocapacitors.