基于Li_4Mn_5O_(12)的铝改性锰基锂离子筛前体的制备

Synthesis of Al-doped lithium ion-sieve precursor based on Li_4Mn_5O_(12)

分别采用固相法和水热法开展了基于Li_4Mn_5O_(12)的铝改性锂离子筛前体的制备,对所得前体的酸洗脱性能及锂离子筛的吸附性能进行了探究,重点考察了水热时间和焙烧温度对水热法制备锂离子筛前体的影响,并借助X射线衍射(XRD)、扫描电镜(SEM)、气体渗透性测试等对产物进行了表征。结果表明,锂离子筛前体Li Al_(0.5)Mn_(4.5)O_(12)的酸洗脱性能和吸附性能最优;在水热反应温度为120℃、水热反应时间为8 h、焙烧温度为500℃条件下制得的锂离子筛前体晶体结构完好,前体膜具有一定的选择分离能力。

Aluminum-doped lithium ion-sieve precursors based on Li4Mn5O12 were synthesized by the solid reaction method and hydrothermal method,respectively.The properties of acid elution of the precursor, the adsorption of the lithium ion-sieve,and the effects of reaction conditions,such as hydrothermal time and calcination temperature on the preparation of lithium ion-sieve precursor by hydrothermal method,were investigated.The products were characterized by means of XRD, SEM,and gas permeability test etc..Results showed that the properties of acid elution and the adsorption of lithium ionsieve precursor Li Al0.5Mn4.5O12（Al-5-LMO） were the optimal.Under the conditions of hydrothermal time 8 h and calcination temperature of 500 ℃,the crystal structure of the product was intact,and the membranaceous product had a certain property of selectivity and separation.