论文部分内容阅读
系统地了解钴酸锂(LiCoO_2)在不同介质环境中的物理化学性质有助于从理论上指导该物质的合成工艺设计以及报废LiCoO_2再利用的工艺设计。本实验将LiCoO_2与Na HSO_4·H_2O、LiCoO_2与Na2S2O7分别按摩尔比1:3、1:1.5的比例混合后进行酸性焙烧,采用TG-DSC-MS、XRD、SEM、EDS研究了焙烧过程中元素赋存形式的演变规律以及元素分布特征。结果表明:LiCoO_2与Na HSO_4·H_2O、Na_2S_2O_7的混合物在焙烧过程中发生了明显的化学反应。焙烧产物中Na元素的赋存形式有Na_2SO_4、LiNaSO_4和Na6Co(SO_4)_4,Li元素的赋存形式为LiNaSO_4,Co元素的赋存形式为Na_6Co(SO_4)_4。焙烧产物致密,形状不规则,Co元素在焙烧产物中分布均匀。
A systematic understanding of the physicochemical properties of lithium cobalt oxide (LiCoO 2) in different media environments helps to theoretically guide the design of the synthesis process of the material and the process design of reusing LiCoO 2. In this experiment, the acid roasting was carried out by mixing LiCoO_2 and Na HSO_4 · H_2O, LiCoO_2 and Na 2 S 2 O 7 in the molar ratio of 1: 3 and 1: 1.5 respectively. The contents of the elements in the roasting process were investigated by TG-DSC-MS, XRD, SEM and EDS Evolution pattern of existential forms and element distribution features. The results show that the mixture of LiCoO_2 with Na HSO 4 · H 2 O and Na 2 S 2 O 7 have obvious chemical reaction during the calcination. The calcined products contain Na_2SO_4, LiNaSO_4 and Na_6Co (SO_4) _4, the Li element is LiNaSO_4, and the Co element is Na_6Co (SO_4) __4. The roasted product is dense and irregular in shape, and the Co element is uniformly distributed in the roasted product.