Zhang Kaiqiang, Lee Tae Hyung, Bubach Bailey, Ostadhassan Mehdi, Jang Ho Won, Choi Ji-Won, Shokouhimehr Mohammadreza
Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University Seoul 08826 Republic of Korea
Electronic Materials Center, Korea Institute of Science and Technology (KIST) Seoul 136-791 Republic of Korea
RSC Adv. 2019 Aug 27;9(46):26668-26675. doi: 10.1039/c9ra03746b. eCollection 2019 Aug 23.
Prussian blue analogs (PBAs) are a type of metal-organic framework and have drawn significant attention recently. To date, most are constructed with divalent transition metal ions coordinated to the N end of a cyanide bridge. In this report, we studied a trivalent gallium ion-based Ga hexacyanocobaltate (GaHCCo), which depicted a face-centered cubic crystal structure. In addition, the synthesized GaHCCo was demonstrated as a cathode material of lithium-ion batteries (LIBs) and was found to exhibit long-term stability, having a capacity retention of 75% after 3000 cycles of repeated charge-discharge cycling and an extremely high coulombic efficiency of 98%, which was achieved because of a solid-state diffusion controlled Li-ion storage process. After XRD analysis on the different charge stages, the Li-ion storage in the GaHCCo was attributed to the Co species the formation of a Li/Co compound. This work will pave the way toward the study of PBAs constructed with trivalent metal ions and provide more insights into the development of high-performance LIBs in the future.
普鲁士蓝类似物（PBAs）是一种金属有机框架材料，近年来备受关注。迄今为止，大多数PBAs是由与氰化物桥的N端配位的二价过渡金属离子构建而成。在本报告中，我们研究了一种基于三价镓离子的六氰合钴酸镓（GaHCCo），它呈现出面心立方晶体结构。此外，合成的GaHCCo被证明是锂离子电池（LIBs）的阴极材料，并且具有长期稳定性，在3000次反复充放电循环后容量保持率为75%，库仑效率极高，达到98%，这是由于固态扩散控制的锂离子存储过程所致。在对不同充电阶段进行XRD分析后，GaHCCo中的锂离子存储归因于钴物种——形成了锂/钴化合物。这项工作将为研究由三价金属离子构建的PBAs铺平道路，并为未来高性能LIBs的发展提供更多见解。
