Zhou Kai, Guo Baiyu, Ma Jun, Cui Siyu, Bao Yuying, Wang Tao, Qiu Hailong, Jin Di
Clean Nano Energy Center, State Key Laboratory of Metastable Materials Science and Technology, School of Materials Science and Engineering, Yanshan University, Qinhuangdao 066004, P. R. China.
State Key Laboratory of Metastable Materials Science & Technology and Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, China.
Phys Chem Chem Phys. 2024 May 22;26(20):14898-14907. doi: 10.1039/d4cp00847b.
The ferric trichloride (FeCl)-intercalated graphite intercalation compound (GIC) has high reversible capacity and bulk density, making it a promising anode material for lithium ion batteries. However, its practical application has been limited by the poor cycle performance due to chloride dissolution and shuttling issues. Herein, FeCl-GIC is used as the precursor material to synthesize a nano-FeO-modified intercalation material by a solvothermal method. The FeO moiety at the edge of FeCl-GIC provides a robust chemical anchoring effect on the chlorides. Together with the two-dimensional graphite layer, it forms a confinement space, which effectively immobilizes soluble chlorides. Attributed to the distinctive structural design, the FeO-FeCl/GIC 25% C electrode offers a high reversible capacity of 691.4 mA h g at 1000 mA g after 400 cycles. At 2000 and 5000 mA g, the reversible specific capacity of the FeO-FeCl/GIC 25% C electrode is 345.6 and 218.3 mA h g, respectively. This work presents an innovative method to improve the lifespan of GIC.
三氯化铁（FeCl）插层石墨插层化合物（GIC）具有高可逆容量和堆积密度，使其成为锂离子电池有前景的负极材料。然而，由于氯化物溶解和穿梭问题导致的循环性能差限制了其实际应用。在此，FeCl-GIC用作前驱体材料，通过溶剂热法合成了一种纳米FeO改性的插层材料。FeCl-GIC边缘的FeO部分对氯化物具有强大的化学锚固作用。与二维石墨层一起，形成了一个限制空间，有效地固定了可溶性氯化物。由于独特的结构设计，FeO-FeCl/GIC 25% C电极在1000 mA g下循环400次后提供了691.4 mA h g的高可逆容量。在2000和5000 mA g下，FeO-FeCl/GIC 25% C电极的可逆比容量分别为345.6和218.3 mA h g。这项工作提出了一种提高GIC寿命的创新方法。
