CAJ | 학술논문

采用二步固相反应法合成了橄榄石型LiFe0.98Ni0.02PO4/C复合正极材料。通过X射线衍射光谱法(XRD)、扫描电子显微镜法(SEM)、恒流充放电、循环伏安等手段表征了材料的物相结构及电化学性能。结果表明：Ni2+掺杂并未改变LiFePO4的晶体结构，但材料的颗粒尺寸减小(粒径约为200 nm)，颗粒形貌近似球形；LiFe0.98Ni0.02PO4/C材料具有良好的电化学性能，0.2下首次放电比容量可达143.7 mAh/g，10下，放电比容量为106.9 mAh/g。循环伏安测试表明Ni2+的掺杂提高了Li+在材料中脱嵌过程的可逆性。
채용이보고상반응법합성료감람석형LiFe0.98Ni0.02PO4/C복합정겁재료。통과X사선연사광보법(XRD)、소묘전자현미경법(SEM)、항류충방전、순배복안등수단표정료재료적물상결구급전화학성능。결과표명：Ni2+참잡병미개변LiFePO4적정체결구，단재료적과립척촌감소(립경약위200 nm)，과립형모근사구형；LiFe0.98Ni0.02PO4/C재료구유량호적전화학성능，0.2하수차방전비용량가체143.7 mAh/g，10하，방전비용량위106.9 mAh/g。순배복안측시표명Ni2+적참잡제고료Li+재재료중탈감과정적가역성。
LiFe0.98Ni0.02PO4/C composite was synthesized by two-step solid state reaction. The experiment results show that the lattice structure of LiFePO4 is not destroyed by Ni doping, but the particle morphology with a spherical particle size of 200 nm is improved; LiFe0.98Ni0.02PO4/C composite delivers 143.7 mAh/g, at the 0.2 rate for the first cycles. At the high rates of 10 , this material exhibits high capacities of 106.9 mAh/g. The CV results reveal that the reversibility of LiFePO4/C composite could be improved by Ni doping.