State Key Laboratory of Materials-Oriented Chemical Engineering, College of Materials Science and Engineering, Nanjing Tech University, 30 Puzhu South Road, Nanjing 211816, China.
CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China.
ACS Appl Mater Interfaces. 2023 Feb 1;15(4):5209-5217. doi: 10.1021/acsami.2c19299. Epub 2023 Jan 23.
Chloride-ion batteries (CIBs) have been regarded as a promising alternative battery technology to lithium-ion batteries because of their abundant resources, high theoretical volumetric energy density, and high safety. However, the research on chloride-ion batteries is still in its infancy. Exploring appropriate cathode materials with desirable electrochemical performance is in high demand for CIBs. Herein, the FeOCl nanocrystal embedded in a mesocellular carbon foam (MCF) has been prepared and developed as a high-performance cathode material for CIBs. The MCF with uniform and large mesocells (15.7-31.2 nm) interconnected through uniform windows (15.2-21.5 nm) can provide high-speed pathways for electron and chloride-ion transport and accommodate the strain caused by the volume change of FeOCl during cycling. As a result, the optimized FeOCl@MCF cathode exhibits the highest discharge capacity of 235 mAh g (94% of the theoretical capacity) among those of the previously reported metal (oxy)chloride cathodes for CIBs. A reversible capacity of 140 mAh g after 100 cycles is retained. In contrast, only 18 mAh g was kept for the FeOCl cathode.
氯化物离子电池 (CIBs) 因其资源丰富、理论体积能量密度高、安全性高等特点，被认为是一种很有前途的锂离子电池替代技术。然而，氯化物离子电池的研究仍处于起步阶段。探索具有理想电化学性能的合适阴极材料是 CIBs 的迫切需求。在此，我们制备并开发了一种嵌入介孔碳泡沫 (MCF) 中的 FeOCl 纳米晶体作为高性能 CIBs 阴极材料。具有均匀大介孔 (15.7-31.2nm) 的 MCF 通过均匀窗口 (15.2-21.5nm) 相互连接，可以为电子和氯离子的传输提供高速通道，并容纳 FeOCl 在循环过程中体积变化引起的应变。结果表明，优化后的 FeOCl@MCF 阴极的放电容量最高，为 235 mAh g（94%的理论容量），高于之前报道的 CIBs 金属（氧）氯化物阴极。100 次循环后仍保持 140 mAh g 的可逆容量，而 FeOCl 阴极仅保持 18 mAh g。
