【摘要】 以 L i2 CO3 和 Mn O2 (EMD)为原料 ,用固相反应法合成了 λ- Mn O2 锂离子筛前驱体正尖晶石结构的L i Mn2 O4;通过 TG- DTA、XRD和 SEM分析 ,确定了最佳制备条件 :合成温度为 85 0°C,L i/ Mn的摩尔比为 0 .5 ,保温时间为 2 4h;设计和制作了流态化的离子交换装置 ,用 0 .2 0 mol· L- 1和 0 .5 0 mol· L- 1的盐酸分别对 L i Mn2 O4进行了动态酸浸析 ,并得到了高纯度的 λ- Mn O2 ,同时采用原子吸收光谱 (AAS)测定了交换液中锂的浸出和锰的溶损情况 .更多还原

【Abstract】 The normal spinel-type structure LiMn 2O 4 for lithium ion-sieve precursor was synthesized by a solid-state reaction of Li 2CO 3 and MnO 2(EMD).The optimum conditions for the synthesis of LiMn 2O 4 , determined by means of TG-DTA?XRD and SEM, were heating the mixtures of Li 2CO 3 and MnO 2(EMD) with Li/Mn molar ratio 0.5 at 850 °C in air for 24 h.The ion-exchange device for dynamic method were designed and made. LiMn 2O 4 was delithiated dynamically using 0.20 mol·L -1 and 0.50 mol·L -1 HCl respectively, furthermore λ-MnO 2 with high purity was prepared. At the same time, the concentrations of the lithium-ion extracted and the manganese-ion dissolved in the exchanged solutions were determined by atomic absorption spectroscopy(AAS).更多还原