Integrate electrical conductivity and Li+ ion mobility into hierarchical heterostructure Ti3C2@CoO/ZnO composites toward high-performance lithium ion storage

Hong Tang, Mengjin Jiang, Erhui Ren, Yue Zhang, Xiaoxu Lai, Ce Cui, Shouxiang Jiang, Mi Zhou, Qin Qin and Ronghui Guo

Energy, 2020, vol. 212, issue C

Abstract: The structural instability and low electrical conductivity of CoO and ZnO cause their rapid capacity fading when it is used for lithium ion storage, which limits their applications. In response, a hierarchical heterostructure was formed by anchoring CoO/ZnO nanodots onto the surface of Ti3C2 to effectively address the above issue. Ti3C2 has an excellent electrochemical performance which can effectively enhance the electrical conductivity of CoO/ZnO and facilitate lithium ion mobility, and CoO/ZnO nanodots that are uniformly anchored on the Ti3C2 surface can effectively inhibit the aggregation of CoO/ZnO nanodots during cycling. As an anode electrode for lithium-ion batteries, the Ti3C2@CoO/ZnO electrode exhibits a high reversible capacity (1069 mA h g−1 at 0.2 A g−1 for over 120 cycles), excellent cycleability (1052 mA h g−1 at 0.5 A g−1 for over 200 cycles, and 627 mA h g−1 at 1 A g−1 for over 300 cycles) and exceptional rate capacity (498 mA h g−1 at 3 A g−1, and holds 794.3 mA h g−1 after 110 cycles when the current is controlled at 0.1 A g−1 again). This work paves the way for the structural modification of other types of metal oxides (sulfides) to enhance electrochemical performance.

Keywords: Lithium ion storage; CoO/ZnO nanodots; Ti3C2; Hierarchical heterostructure structure; Excellent cycleability (search for similar items in EconPapers)
Date: 2020
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:212:y:2020:i:c:s0360544220318041

DOI: 10.1016/j.energy.2020.118696

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