Reactive self-assembled hybrid SnO2-Co3O4 nanotubes with enhanced lithium storage capacity and stability for highly scalable Li-Ion batteries

Jingfei Zhang, Qixing Zhou, Shaoyi Hou, Zhenbo Zhang, Dongmei Sun, Lin Xu, Kai Huang, Yawen Tang
2021 Chemical Engineering Journal Advances  
a r t i c l e i n f o Keywords: Kirkendall effect SnO 2 -Co 3 O 4 nanotubes Synergistic effect Cycling stability Lithium ion battery a b s t r a c t The Development of transformative technology capable of producing inexpensive superior lithium electroactive anode material with low volume changes and stable performance on cycling is an important step on the path to advanced application of lithium ion batteries (LIBs). In this work, a new synthesis strategy for hybrid SnO 2 -Co 3 O 4 nanotubes,
more » ... 3 O 4 nanotubes, based on electrospun polyvinylpyrrolidone (PVP) fibers with co-embedded metal precursors is explored. This low cost, template-free, Kirkendall effect-derived process first yields phase-separated core-sheath PVP/SnO 2 -Co 3 O 4 composites, creating highly uniform and well-dispersed nanotubes via self-assembly accompanying gradual PVP combustion. Control experiments show that the heat-treatment atmosphere is the key for the in situ growing in a large yield. On account of the great buffering capability in hierarchical porous architecture, synergistic effect of active multi-components and the present interfacial Co nanophase, the proposed tubular hybrids possess enhanced cyclic stability and lithium storage capacity as anodes with retained capacity as high as 873 mAh g − 1 even after 200 cycles at 100 mA g − 1 . The protocol paves the way for rational design of hollow hybrid nanotubes with wide applications. (Y. Tang). 1 Both authors contributed equally to this work. the electrolyte. However, anodes derived from SnO 2 , as with other oxide based materials, usually suffer from drastic volume change during Li insertion and deinsertion, e.g. reaching 358 % in the case of Sn to Li 4.4 Sn, a possible step of SnO 2 reversibly reacting with lithium [10] [11] [12] . This may lead to active phase segregation and crystallographic deformation, resulting in significant capacity fading upon cycling. Previous study has shown that the cyclability and specific capacity can be improved by nanoengineering. Various tin oxide-based nanostructures have been explored with improved lithium storage performance, from zero dimensional (0D) hollow core-shell mesospheres [13] /nanoparticles [14] , one dimensional (1D) nanofibers [15] /nanotubes [7] /nanorods [16] , nanowires [17] , two dimensional (2D) nanosheets [ 18 , 19 ]/thin films [20] , to three dimensional (3D) nano-hollow structures in different sizes and compositions [ 21 , 22 ]. Among those, hybrid hollow nanostructure, especially 1D nanotube with axially and radially modulated compositions, can be more satisfactory due to the structural advantages discussed above and potential interfacial and synergic effects of the mixed components [ 23 , 24 ]. A recent study shows that the presence of a nanosized transition metal cobalt can efficiently catalyze the conversion of Sn
doi:10.1016/j.ceja.2021.100121 fatcat:pmg5e5xhpnh5tk7rk4taqfso6q