催化剂前驱体Fe(NO_3)_3对LiFePO_4/C倍率性能的影响

Effects of catalyst precursor Fe(NO_3)_3 on rate performance of LiFePO_4/C

以蔗糖和葡萄糖为碳源，Fe（NO3）3为催化剂前驱体，用碳热还原法合成LiFePO4/C复合材料，分析了产物的微观结构、形貌及电化学性能。蔗糖热解形成的碳包覆层石墨化程度高，可提高材料的倍率性能；Fe（NO3）3可优化包覆层的碳结构。在4．2～2．5V循环，制备的LiFePO4／C复合材料的5．0C首次放电比容量为112．3mAh／g，为1．0C时的77％。

LiFePO4/C composite was synthesized via carbothermal reduction process. Sucrose and glucose were used as carbon source; Fe（ NO3 ）3 was used as catalyst precursor. The microstructure, morphology and the electrochemical performance of the product were analyzed. The degree of graphitization of pyrolysis of carbon coating formed by sucrose was high and thus improved the high-rate performance of the material. Fe（ NO3 ）3 could optimize the structure of the coating. When cycled at 4.2-2.5 V, the 5.0 C initial specific discharge capacity of prepared LiFePO,/C composite was 112.3 mAh/g,77% of the 1.0 C discharge.