锂离子电池正极材料铁掺杂V_6O_(13)的制备及电化学性能

为有效提高V_6O_(13)正极材料在高锂状态下的放电比容量和改善循环性能,使用一种先制备前驱体再水热合成的方法制备铁掺杂V_6O_(13)。运用XRD,SEM和XPS表征铁掺杂V_6O_(13)的物相、形貌以及表面元素价态,并对铁掺杂V_6O_(13)的电化学性能进行研究与分析。掺杂不同数量的铁可以得到不同形貌且电化学性能各异的铁掺杂V_6O_(13)。其中0.02样品的有序堆垛纳米片的厚度最大(600~900nm),纳米片之间的空隙最大。铁掺杂V_6O_(13)样品的放电性能均好于纯V_6O_(13),其中0.02样品的电化学性能最好,首次放电比容量为433mAh·g-1,100次循环后的容量保存率为47.1%。

Synthesis and Electrochemical Properties of Fe-doped V6O13 as Cathode Material for Lithium-ion Battery

Fe-doped V6O13 was synthesized via a facile hydrothermal method after preparing precursor in order to improve the discharge capacity and cycle performance of V6O13 cathode material at high-lithium state.XRD,SEM and XPS were employed to characterize the phase,morphology and valence of the Fe-doped V6 O13.Meanwhile,the electrochemical performance was analyzed and researched.Different morphologies and electrochemical performances of Fe-doped V6 O13 were obtained via doping different contents of Fea+ ion.The sample 0.02 presented the largest thickness of nanosheets (the thickness of 600-900nm) and clearance between layers.The Fe-doped V6 O13 has a better electrochemical performance than that of pure V6 O13.The sample 0.02 exhibits the best electrochemical performance,the initial discharge specific capacity is 433mAh · g-1 and the capacity retention is 47.1％ after 100 cycles.