Oxocarbon Salts for Fast Rechargeable Batteries.
Oxocarbon Salts for Fast Rechargeable Batteries.
复制标题
DOI：
10.1002/anie.201607194
复制
发表时间：
2016-09
影响因子：
--
通讯作者：
Qing Zhao;Jianbin Wang;Yong Lu;Yixin Li;G. Liang;Jun Chen
中科院分区：
文献类型：
--
作者：
Qing Zhao;Jianbin Wang;Yong Lu;Yixin Li;G. Liang;Jun Chen
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，合理设计了氧碳盐（M2 (CO)n），并将其用作可充电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2个或4个金属离子，而M2 (CO)4表现出较弱的电化学活性。特别是，我们发现K2 C6 O6电极可以在0.2℃和10℃下以212 mA h g（-1）和164 mA h g（-1）的速度实现钾离子的超快插入/提取，这可以归因于K2 C6 O6具有接近0.9 eV的窄带隙的天然半导体特性、k离子电解质的高离子电导率以及k离子扩散过程的促进。介绍了以k4c6 O6为阴极，k4c6 O6为阳极的摇椅反应机理的k离子电池，其工作电压为1.1 V，能量密度为35 Wh kg（-1）。这项工作为利用可再生和丰富的钾材料构建快速钾离子电池提供了一个有趣的策略。
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.