Porous SnO₂/CNT composite anodes: Influence of composition and deposition temperature on the electrochemical performance

Abstract

Porous SnO 2 /multiwalled carbon nanotube (CNT) thin film composites as anode material for Li-ion batteries were prepared using the electrostatic spray deposition (ESD) technique. The morphologies of the samples were found to be affected mainly by deposition temperatures. Electrochemical test cells were assembled using the as-prepared samples without any conductive additive or binder. The influence of deposition temperature and CNT content on the electrochemical performance of the anodes was investigated. Compared to pure tin oxide and pure CNT, the composite anode materials showed better discharge capacity and cyclability. Among the composites, the sample deposited at 250 C with 30 wt% CNT content was found to show better energy capacity. This can be ascribed to the porous nature of the anodes and the improvement in the conductivity by the addition of CNTs.

Engineering nanostructured anodes via electrostatic spray deposition for high performance lithium ion battery application

“…In order to further increase the battery performance of the SnO 2 anode, we introduced carbon nanotubes (CNTs) into the SnO 2 anode to obtain a SnO 2 /CNT composite by an ESD process. 63 The composite morphologies were demonstrated to be mainly impacted by deposition temperatures because the degree of the solvent evaporation determines the morphologies of the as-prepared anodes. At low temperature, the solvent is evaporated from the substrate more slowly, which results in a rather dense morphology with voids.…”

“…These dendrites can contact the cathode electrode resulting in an internal short circuit which can cause combustion of the lithium. 57 Therefore, intensive research effort has been directed to nding anode materials with higher discharge capacities for carbon replacement, such as Sn, [58][59][60][61] SnO 2 , [62][63][64][65][66][67][68] and transition metal oxides (such as: Fe 2 O 3 , [69][70][71] CoO, [72][73][74] CuO 75,76 ), etc. Anode materials can be classied into three categories based on the electrochemical reaction mechanism: (1) intercalationde-intercalation (such as: graphite, Li 4 Ti 5 O 12 and TiO 2 , etc.…”

Nanostructured Electrodes Via Electrostatic Spray Deposition for Energy Storage System

“…It is demonstrated that Sn@carbon composite fabricated by ESD improved the lithium ion battery performance. Besides Sn based materials, other alloying reaction materials, such as SnO 2 based materials have also been studied in our group [22][23] and different levels of enhancement were achieved.…”

C-MEMS for bio-sensing applications

“…Graphene, on the other hand, is the one-atom thick allotrope of carbon which also for its known extraordinary properties has been used both in pristine and composite forms for applications in supercapacitors [21], biofuel cells, lithium-ion batteries and fuel cells. The electrostatic spray deposition (ESD) method is a flexible technique that has been efficiently applied for the deposition of CNTs, graphene [22] and different metal oxide materials onto C-MEMS based 3D microstructures [23][24][25]. During ESD process [23], the precursor solution is atomized in an aerosol and directed on a heated substrate while a high electrical potential is applied between the spray nozzle and the substrate.…”