CAJ | 학술논문

以PEG为碳源,采用共沉淀法合成了LiFePO_4/C复合正极材料.采用热重和示差扫描量热分析(TG-DSC)分析了前驱体的热分解过程;通过X射线衍射(XRD)、扫描电镜仪(SEM)和恒电流充放电测试等手段对材料的结构、形貌和电化学性能进行了表征.考察了PEG的分解速率和添加量对材料结构、形貌和电化学性能的影响.结果表明:当PEG分解温度区间的升温速率为6℃/min、n(PEG):n(LFP)=0.5:1时,合成的正极材料具有较好的电化学性能.0.1 C倍率下首次放电比容量达到164.7 mAh/g,循环30次后,比容量衰减率为4.75%.
이PEG위탄원,채용공침정법합성료LiFePO_4/C복합정겁재료.채용열중화시차소묘량열분석(TG-DSC)분석료전구체적열분해과정;통과X사선연사(XRD)、소묘전경의(SEM)화항전류충방전측시등수단대재료적결구、형모화전화학성능진행료표정.고찰료PEG적분해속솔화첨가량대재료결구、형모화전화학성능적영향.결과표명:당PEG분해온도구간적승온속솔위6℃/min、n(PEG):n(LFP)=0.5:1시,합성적정겁재료구유교호적전화학성능.0.1 C배솔하수차방전비용량체도164.7 mAh/g,순배30차후,비용량쇠감솔위4.75%.
LiFePO_4/C composite was synthesized via co-precipitation method with PEG as carborr source. The pyrolysis process of precursor was monitored by TG-DSC. The structure, morphology and electrochemical properties of UFePO4/C were characterized by XRD,SEM and galvanostatic charge-discharge techniques, respectively. The influence of decomposing rate and the amount of PEG on structure, morphology and electrochemical properties was studied. The optimum experimental conditions is 6 ℃/min of heating rate and n (PEG) : n (LFP)=0.5 : 1, and the discharge capacity up to 164.7 rnAh/g is obtained at 0.1 C and the loss is only 4.75% after 30 cycles.