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Mesoporous TiO 2 nanosheets anchored on graphene for ultra long life Na-ion batteries

Mesoporous TiO 2 nanosheets anchored on graphene for ultra long life Na-ion batteries

Nanotechnology 29(22): 225401

Sodium-ion batteries, which have a similar electrochemical reaction mechanism to lithium-ion batteries, have been considered as one of the most potential lithium-ion battery alternatives due to the rich reserves of sodium. However, it is very hard to find appropriate electrode materials imputing the large radius of sodium-ion. TiO2 is particularly interesting as anodes for sodium-ion batteries due to their reasonable operation voltage, cost, and nontoxicity. To obtain a better electrochemical property, mesoporous TiO2 nanosheets (NSs)/reduced graphene oxide (rGO) composites have been synthesized via a scalable hydrothermal-solvothermal method with a subsequent calcination process. Benefitting from unique structure design, TiO2 NSs@rGO exhibits a superior cycle stability (90 mAh g-1 after 10 000 cycles at a high current rate of 20 C) and satisfactory rate performance (97.3 mAh g-1 at 25 C). To our knowledge, such ultra long cycle life has not previously been reported.

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Accession: 065310422

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PMID: 29521276

DOI: 10.1088/1361-6528/aab562

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