Defective ZnCo2O4 with Zn vacancies: Synthesis, property and electrochemical application

Guoyong Huang, Yue Yang, Hongyu Sun, Shengming Xu, Junlian Wang, Mashkoor Ahmad, Zhenghe Xu

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    Abstract

    Through the liquid-phase co-precipitation and alkaline-tailored method, the defective ZnCo2O4 with Zn vacancies (Zn0.95Co2O4) has been synthesized, which is similar to the crystal phase, morphology, and particle size of the pure ZnCo2O4 before etched, except the enlarged BET specific surface. For the first time, the Zn0.95Co2O4 has been evaluated as an anode material for lithium-ion batteries. The Zn vacancies in defective ZnCo2O4 may decrease the probability of the reversible by-reaction between Zn and Li-Zn alloy by the cyclic voltammogram measurement. Compared to the traditional ZnCo2O4, the Zn vacancies in defective ZnCo2O4 can provide larger interface, activate more reaction sites and expand faster transport paths for both of Li-ions and electronics insertion/extraction, so the electrochemical performance of defective ZnCo2O4 has been enhanced highly. The discharge capacity retains at 652.2 mAh.g-1 under 0.4 A g-1 after 200 cycles. When the rate returns to 0.4 A g-1, the average discharge capacity could be recovered to 748.9 mAh.g-1 under the multiple-step high rates after many cycles.
    Original languageEnglish
    JournalJournal of Alloys and Compounds
    Volume724
    Pages (from-to)1149-1156
    Number of pages8
    ISSN0925-8388
    DOIs
    Publication statusPublished - 2017

    Keywords

    • ZnCo2O4
    • Vacancy
    • Defect
    • Nanosheet
    • Anode
    • Energy storage materials

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