Ultrafast cation insertion-selected zinc hexacyanoferrate for 1.9 V K–Zn hybrid aqueous batteries,Journal of Materials Chemistry A

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Ultrafast cation insertion-selected zinc hexacyanoferrate for 1.9 V K–Zn hybrid aqueous batteries
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020/03/25 , DOI: 10.1039/c9ta13497b
Meng Huang _{1,

2,

3,

4,

5} , Jiashen Meng _{1,

2,

3,

4,

5} , Zijian Huang _{1,

2,

3,

4,

5} , Xuanpeng Wang _{3,

4,

5,

6,

7} , Liqiang Mai _{1,

2,

3,

4,

5}

Affiliation

The low energy/power density of aqueous rechargeable batteries (ARBs) have limited their further development and application because of their voltage limitation of 1.23 V. Herein, K–Zn hybrid ARBs with a high discharge voltage of 1.937 V are reported for the first time. The selective ionic insertion/extraction mechanism into/from the zinc hexacyanoferrate (ZnHCF) cathode in the hybrid electrolyte was clearly revealed by in situ X-ray diffraction. The cathode material displays an outstanding rate capability of 300C and a high capacity of 78.7 mA h g⁻¹. The constructed K–Zn hybrid ARBs exhibit an energy density of 67 W h kg⁻¹, a high power density of 4.76 kW kg⁻¹ and excellent rate performance with 67.6% capacity retention from 2C to 60C. These excellent performances contribute to the selected K⁺ insertion mechanism. These exciting results can offer an alternative path for the development of hybrid aqueous batteries for stable and high energy/power density energy storage techniques.

中文翻译：

用于1.9 VK-Zn混合水性电池的超快阳离子插入选择六氰合铁酸锌

水性充电电池（ARB）的低能量/功率密度因其1.23 V的电压限制而限制了其进一步的开发和应用。在此，首次报道了放电电压为1.937 V的K-Zn混合ARB。。通过原位X射线衍射清楚地揭示了混合电解质中六氰合铁酸锌（ZnHCF）阴极的选择性离子插入/提取机理。正极材料显示出出色的300C倍率能力和78.7 mA hg ^-1的高容量。构造的K-Zn混合ARB的能量密度为67 W h kg ^-1，高功率密度为4.76 kW kg ^-1和出色的速率性能，从2C到60C的容量保持率为67.6％。这些出色的性能有助于选择K ⁺插入机制。这些令人兴奋的结果可以为开发用于稳定和高能量/功率密度储能技术的混合水性电池提供一条替代途径。

更新日期：2020-04-08

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