Yao Wenjiao, Armstrong A Robert, Zhou Xiaolong, Sougrati Moulay-Tahar, Kidkhunthod Pinit, Tunmee Sarayut, Sun Chenghua, Sattayaporn Suchinda, Lightfoot Philip, Ji Bifa, Jiang Chunlei, Wu Nanzhong, Tang Yongbing, Cheng Hui-Ming
Functional Thin Films Research Center, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055, China.
School of Chemistry, University of St Andrews, St Andrews, Fife, KY16 9ST, UK.
Nat Commun. 2019 Aug 2;10(1):3483. doi: 10.1038/s41467-019-11077-0.
The growing demand for advanced lithium-ion batteries calls for the continued development of high-performance positive electrode materials. Polyoxyanion compounds are receiving considerable interest as alternative cathodes to conventional oxides due to their advantages in cost, safety and environmental friendliness. However, polyanionic cathodes reported so far rely heavily upon transition-metal redox reactions for lithium transfer. Here we show a polyanionic insertion material, LiFe(CO), in which in addition to iron redox activity, the oxalate group itself also shows redox behavior enabling reversible charge/discharge and high capacity without gas evolution. The current study gives oxalate a role as a family of cathode materials and suggests a direction for the identification and design of electrode materials with polyanionic frameworks.
对先进锂离子电池不断增长的需求推动了高性能正极材料的持续发展。聚阴离子化合物因其在成本、安全性和环境友好性方面的优势，作为传统氧化物的替代阴极受到了广泛关注。然而，迄今为止报道的聚阴离子阴极在锂转移方面严重依赖过渡金属氧化还原反应。在此，我们展示了一种聚阴离子插入材料LiFe(CO)，其中除了铁的氧化还原活性外，草酸根自身也表现出氧化还原行为，能够实现可逆充放电且具有高容量，同时不会产生气体。当前的研究赋予了草酸根作为一类阴极材料的角色，并为具有聚阴离子骨架的电极材料的识别和设计指明了方向。
