Key Laboratory of Advanced Energy Materials Chemistry and State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, China.
Collaborative Innovation Center of Chemical Science and Engineering, Nankai University, Tianjin 300071, China.
Angew Chem Int Ed Engl. 2016 Sep 26;55(40):12528-32. doi: 10.1002/anie.201607194. Epub 2016 Sep 8.
Oxocarbon salts (M2 (CO)n ) prepared through one-pot proton exchange reactions with different metal ions (M=Li, Na, K) and frameworks (n=4, 5, 6) have been rationally designed and used as electrodes in rechargeable Li, Na, and K-ion batteries. The results show that M2 (CO)5 /M2 (CO)6 salts can insert two or four metal ions reversibly, while M2 (CO)4 shows less electrochemical activity. Especially, we discover that the K2 C6 O6 electrode enables ultrafast potassium-ion insertion/extraction with 212 mA h g(-1) at 0.2 C and 164 mA h g(-1) at 10 C. This behavior can be ascribed to the natural semiconductor property of K2 C6 O6 with a narrow band gap close to 0.9 eV, the high ionic conductivity of the K-ion electrolyte, and the facilitated K-ion diffusion process. Moreover, a first example of a K-ion battery with a rocking-chair reaction mechanism of K2 C6 O6 as cathode and K4 C6 O6 as anode is introduced, displaying an operation voltage of 1.1 V and an energy density of 35 Wh kg(-1) . This work provides an interesting strategy for constructing rapid K-ion batteries with renewable and abundant potassium materials.
通过与不同金属离子（M=Li、Na、K）和框架（n=4、5、6）的一锅质子交换反应制备的氧化羰盐（M2（CO）n）已被合理设计并用作可充电 Li、Na 和 K 离子电池的电极。结果表明，M2（CO）5/M2（CO）6 盐可以可逆地插入两个或四个金属离子，而 M2（CO）4 的电化学活性较低。特别是，我们发现 K2C6O6 电极在 0.2 C 时具有 212 mA h g-1 的超快钾离子嵌入/提取能力，在 10 C 时具有 164 mA h g-1 的超快钾离子嵌入/提取能力。这种行为可以归因于 K2C6O6 的固有半导体性质，其带隙接近 0.9 eV，K-离子电解质的高离子电导率以及促进的 K-离子扩散过程。此外，介绍了首例以 K2C6O6 为阴极和 K4C6O6 为阳极的摇椅式反应机制的 K 离子电池，其工作电压为 1.1 V，能量密度为 35 Wh kg-1。这项工作为构建具有可再生和丰富钾材料的快速 K 离子电池提供了一种有趣的策略。
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