多孔FeF_(2)正极材料的制备及电化学性能研究

Preparation and Electrochemical Performance of Porous FeF_(2) Cathode Materials

利用分解反应中大比例质量损失和大量气体产生,制备出具有40.369m2·g^(-1)大比表面积的多孔FeF_(2)材料。多孔结构为FeF_(2)材料构建了优异的离子和电子导电通路,表现出优秀的倍率性能和循环性能。在2C、5C和15C的倍率下分别表现出589.21mAh·g^(-1)、406.95mAh·g^(-1)和83.53mAh·g^(-1)的高放电比容量。在0.5C和2C下,循环100次后放电比容量分别为502.5mAh·g^(-1)和267.9mAh·g^(-1)。该结果为电池正极材料提升倍率性能提供了新思路。

The porous FeF_(2) material with a large specific surface area of 40.369 m2·g^(-1) is prepared by taking advantage of the large percentage mass loss and large gas production during the decomposition reaction.The porous structure provides an excellent ion and electron conducting pathway for the FeF_(2) material,which exhibits excellent rate performance and cycling performance.It has a high discharge specific capacities of 589.21 mAh·g^(-1),406.95 mAh·g^(-1) and 83.53 mAh·g^(-1) at rates of 2 C,5 C and 15 C,respectively.The discharge specific capacities are 502.5 mAh·g^(-1) and 267.9 mAh·g^(-1) after 100 cycles at 0.5 C and 2 C.The results provide new idea for cathode materials to improve rate performance.