CAJ | 학술논문

通过控制水热法过程中的水热反应加热速度,制备了3种不同颗粒尺度的 LiFePO4/C锂离子电池正极材料.结果表明,加热速度越快,LiFePO4/C平均粒径越小,分布越集中.当加热速率从5℃/min升至15℃/min 时,材料颗粒半径从336 nm 减小到200 nm,0．1 C 放电容量从154 mAh/g 增至162 mAh/g,而20 C放电容量则从75 mAh/g 显著增大至127 mAh/g.LiFePO4/C 材料的电化学性能表现出明显的尺度敏感性,特别是在高倍率充放电条件下.
통과공제수열법과정중적수열반응가열속도,제비료3충불동과립척도적 LiFePO4/C리리자전지정겁재료.결과표명,가열속도월쾌,LiFePO4/C평균립경월소,분포월집중.당가열속솔종5℃/min승지15℃/min 시,재료과립반경종336 nm 감소도200 nm,0．1 C 방전용량종154 mAh/g 증지162 mAh/g,이20 C방전용량칙종75 mAh/g 현저증대지127 mAh/g.LiFePO4/C 재료적전화학성능표현출명현적척도민감성,특별시재고배솔충방전조건하.
A series of LiFeO4/C cathode materials with different particle size was synthesized via adjusting the heating rate during the hydrothermal process.When the heating rate was increased from 5 to 1 5 ℃/min,the av-erage particle radius of sample reduced from 336 nm to 200 nm.As results,the discharge capacity and particu-larly the high rate discharge ability of sample were improved.The capacity output of LiFeO4 at 20 C was greatly increased from 75 to 127 mAh/g as the reduction of particle size.The results confirm an obvious particle size sensitivity of electrochemical performance for LiFePO4 material,which is more evident when the material oper-ated at high rates.