Stabilized Molybdenum Trioxide Nanowires as Novel Ultrahigh‐Capacity Cathode for Rechargeable Zinc Ion Battery

Advanced Science

Xingyu Zhao¹  Minghua Chen¹  Xinjun He¹  Xihong Lu¹  Tingshun Zhu²  Zhikun Zheng²  Haozhe Zhang²  Zhiji Han²  Yexiang Tong²  Peng Zhang³ 

[1] Key Laboratory of Engineering Dielectric and Applications (Ministry of Education) Harbin University of Science and Technology Harbin 150080 China;MOE of the Key Laboratory of Bioinorganic and Synthetic Chemistry The Key Lab of Low‐Carbon Chem & Energy Conservation of Guangdong Province School of Chemistry Sun Yat‐Sen University Guangzhou 510275 P. R. China;School of Environment and Civil Engineering Guangdong Engineering and Technology Research Center for Advanced Nanomaterials Dongguan University of Technology Dongguan 523808 China;

关键词: cathodes;    durability;    high‐energy;    MoO3;    Zn ion batteries;   

DOI  :  10.1002/advs.201900151

来源: DOAJ

【 摘 要 】

Abstract Exploration of high‐performance cathode materials for rechargeable aqueous Zn ion batteries (ZIBs) is highly desirable. The potential of molybdenum trioxide (MoO3) in other electrochemical energy storage devices has been revealed but held understudied in ZIBs. Herein, a demonstration of orthorhombic MoO3 as an ultrahigh‐capacity cathode material in ZIBs is presented. The energy storage mechanism of the MoO3 nanowires based on Zn2+ intercalation/deintercalation and its electrochemical instability mechanism are particularly investigated and elucidated. The severe capacity decay of the MoO3 nanowires during charging/discharging cycles arises from the dissolution and the structural collapse of MoO3 in aqueous electrolyte. To this end, an effective strategy to stabilize MoO3 nanowires by using a quasi‐solid‐state poly(vinyl alcohol)(PVA)/ZnCl2 gel electrolyte to replace the aqueous electrolyte is developed. The capacity retention of the assembled ZIBs after 400 charge/discharge cycles at 6.0 A g−1 is significantly boosted, from 27.1% (in aqueous electrolyte) to 70.4% (in gel electrolyte). More remarkably, the stabilized quasi‐solid‐state ZIBs achieve an attracting areal capacity of 2.65 mAh cm−2 and a gravimetric capacity of 241.3 mAh g−1 at 0.4 A g−1, outperforming most of recently reported ZIBs.

【 授权许可】

Unknown