An ultrathin defect-rich Co3O4 nanosheet cathode for high-energy and durable aqueous zinc ion batteries†,Journal of Materials Chemistry A

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An ultrathin defect-rich Co3O4 nanosheet cathode for high-energy and durable aqueous zinc ion batteries†
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2019-09-09 , DOI: 10.1039/c9ta08625k
Yongzhuang Lu _{1,

2,

3,

4} , Jing Wang _{5,

6,

7,

8,

9} , Siqi Zeng _{1,

2,

3,

4} , Lijun Zhou _{1,

2,

3,

4} , Wei Xu _{1,

2,

3,

4} , Dezhou Zheng _{1,

2,

3,

4} , Jie Liu _{4,

10,

11,

12} , Yinxiang Zeng _{5,

6,

7,

8,

9} , Xihong Lu _{1,

2,

3,

4,

5}

Affiliation

The rational design of cathodes with high capacity, rate capability and stability is intriguing but challenging to achieve state-of-the-art aqueous Zn-based batteries. Co₃O₄ has aroused intense interest as cathodes of Zn-based batteries based on its attractive merits of high theoretical capacity in alkaline electrolytes and good thermodynamic stability. Unfortunately, the poor electric conductivity and insufficient active sites of Co₃O₄ materials impede their more extensive applications. Herein, a facile solvothermal reduction strategy is demonstrated to introduce oxygen defects into the ultrathin Co₃O₄ nanosheets (R–Co₃O₄), which function as an advanced cathode for Zn//Co batteries. In comparison with pristine Co₃O₄, the solvothermal reduction process can endow the R–Co₃O₄ sample with improved electric conductivity, enhanced specific surface area and enriched active sites. As a result, the alkaline Zn//Co battery with the R–Co₃O₄ cathode presents a considerable capacity (240.8 mA h g⁻¹), good rate performance and excellent stability. Furthermore, an admirable energy density of 295.5 W h kg⁻¹ (14 mW h cm⁻³) is achieved by this Zn//Co battery, surpassing that of most reported aqueous rechargeable batteries.

中文翻译：

超薄，富含缺陷的Co ₃ O ₄纳米片阴极，用于高能耐用的水性锌离子电池†

具有高容量，倍率能力和稳定性的正极的合理设计引人入胜，但要实现最新的水性Zn基电池具有挑战性。Co ₃ O ₄凭借其在碱性电解液中的高理论容量和良好的热力学稳定性的诱人优点，引起人们对锌基电池正极的强烈兴趣。不幸的是，Co ₃ O ₄材料的差的电导率和不足的活性位点阻碍了它们的更广泛的应用。在本文中，已证明了一种简便的溶剂热还原策略可将氧缺陷引入超薄Co ₃ O ₄纳米片（R–Co ₃ O ₄），用作Zn // Co电池的高级阴极。与原始的Co ₃ O _4相比，溶剂热还原过程可以使R–Co ₃ O ₄样品具有改善的电导率，增加的比表面积和丰富的活性位点。结果，带有R–Co ₃ O ₄阴极的碱性Zn // Co电池具有可观的容量（240.8 mA hg ^-1），良好的倍率性能和出色的稳定性。此外，通过该Zn / Co电池，达到了295.5 W h kg ^-1（14 mW h cm ^-3）的令人敬佩的能量密度，超过了大多数报道的含水可再充电电池的能量密度。

更新日期：2019-10-02

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