【摘要】 用于锂离子电池的MnO因具备比容量高、电势电位较低、资源丰富等优势受到广泛关注。通过静电纺丝法，将MnO束缚在碳纤维上，随后利用CVD沉积一层碳，从而解决MnO导电性差、充放电过程中体积变化大、容易粉化和循环性能差等缺点。MnO前驱体在高温条件下会溶出，研究不同的沉积温度，从而形成竹节状结构，以高聚物碳化得到的碳纤维为导线，连通竹节，增加导电性。利用碳材料良好的缓冲性能，有效限制MnO在充放电过程中的体积膨胀。因此，制备的MnO@ C负极在100 m A/g的电流密度下，充放电循环120次，表现出高达889 m Ah/g的可逆容量，库伦效率接近100%，具有出色的倍率能力和卓越的循环性能(即使在2 000 m Ah/g下，经过200次放电/充电循环后，容量为201 m Ah/g)。此外，利用Raman技术，分析充放电过程中MnO的具体变化，揭示其充放电机理。更多还原

【Abstract】 MnO for lithium-ion batteries is of keen academic interest thanks to its high specific capacity,low potential,and abundance. By electrostatic spinning method,MnO is bound to carbon fiber and then a layer of carbon is deposited using CVD,thus remedying the weaknesses of MnO such as poor conductivity,large volume change during charging and discharging,easy pulverization,and poor cycling performance.The MnO precursor dissolves at high temperatures,and different deposition temperatures are investigated to form a bamboo-like structure,and the carbon fibers obtained by carbonization of polymer are employed as the conductor to connect the bamboo joints and increase the conductivity. The buffering of carbon material is utilized to effectively limit the volume expansion of MnO during the charging and discharging process.Thus,the prepared MnO@ C anode exhibits a reversible capacity of up to 889 m Ah/g at a current density of 100 m A/g for 120 charge-discharge cycles,with a coulombic efficiency of nearly 100%,excellent rate capability and cycling performance( even after 200 discharge/charge cycles of 201 m Ah/g at 2 000 m A/g). Moreover,the Raman technique is employed to analyze the specific changes of MnO during the charging and discharging process to reveal its specific charg-discharge mechanism.更多还原