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Facile synthesis of flower-like hierarchical NiCo2O4 microspheres as high-performance cathode materials for Li-O-2 batteries

TitleFacile synthesis of flower-like hierarchical NiCo2O4 microspheres as high-performance cathode materials for Li-O-2 batteries
Publication TypeJournal Article
Year of Publication2016
AuthorsWang, Liangjun, Zhu Ting, Lyu Zhiyang, Zhang Jian, Gong Lili, Xiao Shuning, Liu Jia, Dong Wenhao, Cui Xinhang, Ho Ghim Wei, and Chen Wei
JournalRSC Adv.
Volume6
Pagination98867–98873
Date Published2016
ISSN2046-2069
Keywordsair batteries, arrays, bifunctional catalyst, carbon, efficient catalyst, electrocatalyst, energy-storage, lithium-oxygen batteries, mesoporous spinel nico2o4, nanoparticles
Abstract

Development of efficient and cost-effective catalyst is one of the key issues for practical lithium-oxygen (Li-O-2) batteries. Herein, we report a facile synthesis of flower-like hierarchical NiCo2O4 microspheres as an effective cathode catalyst for Li-O-2 batteries. The synthesized NiCo2O4 microsphere consists of loosely interconnected nanopetals, which could simultaneously offer sufficient active sites, facilitate mass transfer of Li+/O-2 and provide enough space for Li2O2 deposition. When employed as the cathode catalyst for Li-O-2 batteries, a low discharge/charge voltage gap of 0.86 V can be obtained, much lower than previously reported results for NiCo2O4. Meanwhile, flower-like NiCo2O4 shows improved discharge capacity (3163 mA h g(-1) at 0.08 mA cm(-2)) and better cycle stability (60 cycles at 500 mA h g(-1) capacity limit) compared with NiCo2O4 nanoneedles and bare carbon cathode. The superior electrochemical performance of NiCo2O4, together with the facile fabrication approach, makes NiCo2O4 microspheres a promising candidate for Li-O-2 batteries.

DOI10.1039/c6ra21414b

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