Li2O和Fe2O3对磷酸铁锂玻璃结构及性能的影响

摘要

Lithium-iron-phosphate glasses were prepared and analyzed by FT-IR and DTA. The density and resistance to water attack of the glasses were measured. The influence of molar fraction of Li2O and Fe2O3 on the structure and property of lithium-iron-phosphate glasses were discussed. The results show that the glass density is the largest (2. 760 1 g/cm3 ) and its resistance to water attack is the least (0.53％) when the amount of Li2O is 30％ and Fe2O3 is 20％. The bond P-O-Fe is replaced by the bond P-O-P in the lithium-iron-phosphate glasses with decreasing Fe2O3, and the number of P =O bond increases. As a result, the transformation temperature and crystallization temperature, density and chemical stability of the glass decrease.%制备不同组分的磷酸铁锂(LiFePO4)玻璃,经红外光谱分析(FT-IR)和差热分析(DTA)测定其密度和耐水性,讨论掺加不同摩尔分数的Li2O和Fe2O3对玻璃结构及性能的影响.结果表明:当Li2O摩尔分数为30%,Fe2O3摩尔分数为20%时,玻璃的密度达到最大值2.7601g/cm3,而化学稳定性最小值为0.53%.随Li2O摩尔分数的增加、Fe2O3摩尔分数减少,玻璃结构中部分P-O-Fe键向P-O-P键发生转变,且磷氧双键PO数量逐渐增加,导致玻璃的转变温度及析晶温度降低、密度减小、化学稳定性下降.