Self-assembled novel dandelion-like NiCo2O4 microspheres@nanomeshes with superior electrochemical performance for supercapacitors and lithium-ion batteries. Issue 44 (9th October 2015)

• Record Type: Journal Article
• Authors: Liu, Li; Zhang, Huijuan; Yang, Jiao; Mu, Yanping; Wang, Yu
• Is Part Of: Journal of materials chemistry. Volume 3:Issue 44(2015)
• Page Start: 22393
• Page End: 22403
• Publication Date: 2015-10-09
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c5ta07110k
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Herein, novel dandelion-like NiCo2 O4 microspheres@nanomeshes have been successfully fabricated and displayed superior electrochemical performances for SCs and LIBs. Abstract : Binary metal oxides have been regarded as potential electrode materials for supercapacitors and lithium-ion batteries, which can ameliorate and compensate the deficiency of electrochemical performance of single metal oxides, such as reversible capacitance/capacity, structural stability and electronic conductivity. In this work, we report a facile solvothermal method to synthesize hierarchical dandelion-like NiCo2 O4 microspheres@nanomeshes (NCO-M@N) with a high surface area (105.2 m 2 g −1 ), which exhibit superior pseudocapacitive performance with high specific capacitance (2184 F g −1 ), remarkable rate capability and excellent cycling performance (94.2% retention after 4000 cycles), meanwhile, displaying excellent energy storage properties for lithium-ion batteries, such as admirable rate performance (785 mA h g −1 at a current density of 2000 mA g −1 ) and an outstanding capacity retention of 88% after 100 cycles. Most importantly, when the NCO-M@N//AC asymmetric supercapacitor is prepared, it exhibits the highest energy density (45.3 W h kg −1 ) at a power density of 533.3 W kg −1 and good cycling stability (89% of the initial capacitance retention at 5 A g −1 over 4000 cycles), indicating its potential applications for next-generation high power supercapacitors and lithium-ion batteries. The strategy is simple but very effective, and thus it can be extended to other high-capacity metal oxide materials.