Wang Yan, He Chunxiao, Sun Xiaodong, Liu Xianyu
College of Petroleum and Chemical Engineering, Longdong University Qingyang 74500 China
Institute of Materials and Technology, Dalian Maritime University Dalian 116026 China.
RSC Adv. 2025 Apr 22;15(16):12372-12381. doi: 10.1039/d5ra01479d. eCollection 2025 Apr 16.
Li metal is known as the most ideal anode material for Li-ion batteries due to its high theoretical capacity (3860 mA h g) and low redox potential (-3.04 V SHE). However, the dendrite growth and volume expansion caused by inhomogeneous and loose Li deposition limit the practical application of Li metal anode. Herein, oxidized carbon cloth (OCC) modified with oxygen-containing functional groups (-COOH, -C-OH, C[double bond, length as m-dash]O) is prepared by oxidation in a water bath environment. The polar oxygen-containing functional groups enhance the adsorption capacity of Li, reduce the nucleation barrier, and effectively regulate the uniform distribution of Li on carbon fiber. Meanwhile, the large specific surface area of carbon fiber can reduce the local current density and inhibit dendrite formation. The sufficient internal space of the OCC can store the deposited Li, effectively easing the volume expansion. As such, the OCC‖Li half-cells exhibit a high coulombic efficiency (98.2%) after 250 cycles at 1 mA cm. Besides, the OCC‖LiFePO full cell capacity is 117 mA h g after 300 cycles at 1C. The experimental results show that the OCC prepared by a simple and efficient oxidation method plays a positive role in exploring high energy density Li metal batteries.
锂金属因其高理论容量（3860 mA h g）和低氧化还原电位（-3.04 V 标准氢电极）而被认为是锂离子电池最理想的负极材料。然而，不均匀且疏松的锂沉积导致的枝晶生长和体积膨胀限制了锂金属负极的实际应用。在此，通过在水浴环境中氧化制备了用含氧官能团（-COOH、-C-OH、C=O）修饰的氧化碳纤维布（OCC）。极性含氧官能团增强了锂的吸附能力，降低了成核势垒，并有效调节了锂在碳纤维上的均匀分布。同时，碳纤维的大比表面积可降低局部电流密度并抑制枝晶形成。OCC充足的内部空间可存储沉积的锂，有效缓解体积膨胀。因此，OCC‖Li半电池在1 mA cm下循环250次后表现出高库仑效率（98.2%）。此外，OCC‖LiFePO全电池在1C下循环300次后的容量为117 mA h g。实验结果表明，通过简单高效的氧化方法制备的OCC在探索高能量密度锂金属电池方面发挥了积极作用。
