N掺杂MnO2/碳布复合材料的制备及储锂性能

采用碳布（CC）为柔性基底，通过水热法制备了MnO₂/CC及N掺杂MnO₂/CC无黏结剂负极材料，借助X射线衍射（XRD）、扫描电镜（SEM）、X射线光电子能谱（XPS）、比表面积测试和恒电流充放电对材料进行了结构表征及电化学性能测试。结果表明N掺杂MnO₂/CC具有良好的倍率性能和循环稳定性。在0.1 A·g^-1的电流密度下，其首次充电比容量为948.8 mAh·g^-1，经过不同倍率测试后电流密度恢复至0.1 A·g^-1时仍然保持有907.9 mAh·g^-1的可逆比容量，容量保持率为95.7%。在1 A·g^-1的大电流密度下，其首次充电比容量为640.3 mAh·g^-1，循环100次后仍然保持有529.9 mAh·g^-1的可逆比容量，容量保持率为82.8%，可逆比容量远高于商用MnO₂。

Preparation and Lithium Storage Properties of N Doped MnO2/Carbon Cloth Composites

MnO₂/CC and N doped MnO₂/CC binderless anode materials were prepared by hydrothermal method with carbon cloth (CC) as a flexible substrate, and the structure characterization and electrochemical performance of the materials were tested by means of X-ray diffraction (XRD), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), specific surface area test and galvanostatic charge and discharge. The results showed that N doped MnO₂/CC had good rate performance and cycle stability. The first charge specific capacity of N doped MnO₂/CC was 948.8 mAh·g^-1 at the current density of 0.1 A·g^-1, and the reversible specific capacity remained 907.9 mAh·g^-1 when the current density returned to 0.1 A·g^-1 after different rate tests, and the capacity retention rate was 95.7%. At the high current density of 1 A·g^-1, the initial charging specific capacity of N doped MnO₂/CC was 640.3 mAh·g^-1, the reversible specific capacity still retained 529.9 mAh·g^-1 after 100 cycles, and the capacity retention rate was 82.8%. The reversible specific capacity was much higher than that of commercial MnO₂.