LiNiO_(2)热分解反应动力学研究  

Dynamic Study on the Decomposition of LiNiO_(2)

作　　者：田彦文[1] 高虹[1] 翟玉春[1] 张新[1] 

机构地区：[1]东北大学材料与冶金学院,沈阳110006

出　　处：《无机材料学报》2000年第6期1050-1054,共5页Journal of Inorganic Materials

基　　金：辽宁省科学基金资助项目(9810300702)

摘　　要：用ＤＴＡ和ＸＲＤ研究了ＬｉＮｉＯ２在空气中的热分解过程为：ＬｉＮｉＯ２（ｓ）６５０～７２０℃Ｌｉ２Ｎｉ８Ｏ１０（ｓ）＋４Ｌｉ２Ｏ（ｓ）＋Ｏ２（ｇ）８５０～９５０℃Ｌｉ２Ｏ（ｓ）＋８ＮｉＯ（ｓ）＋１／２Ｏ２（ｇ） １０００～１１５０℃ＮｉＯ（ｓ）＋Ｌｉ２Ｏ（ｇ）用 Ｄｏｙｌｅ－Ｏｚａｗａ法和 Ｋｉｓｓｉｎｇｅｒ法计算了各反应阶段的表观活化能分别为 ７４７．１８±１．０ ｋＪ·ｍｏｌ－１、９３２．４６±１．０ ｋＪ·ｍｏｌ－１和 １１２６．９７±１．０ ｋＪ·ｍｏｌ－１．用 Ｋｉｓｓｉｎｇｅｒ法确定了反应级数和频率因子，确定了三个阶段的动力学方程分别为 ｄα／ｄｔ＝１．７３６ｘ１０３９ｅ－９００００／Ｔ（１－ａ）１．０５７； ｄα／ｄｔ＝１８０６×１０３９ｅ－１１１５００／Ｔ（１－α）０．８４４；ｄα／ｄｔ＝４．２６２×１０４２ｅ－１３５０００／Ｔ（１－α）１．The decomposition of LiNiO2 in the atmosphere was studied by DTA and XRD. The decomposition process was shown as following: LiNiO2(s) 650-720℃ Li2Ni8O10(s)+4Li2O(s)+O2(g) 850-950℃ Li2O(s)+8NiO(s)+1/2O2(g) 1000-1150℃ NiO(s)+Li2O(g). The activation energies of the above three reaction stages were calculated by Doyle-Ozawa method and Kissinger method as 747.18±1.0 kJ·mol-1, 932.46±1.0 kJ·mol-1 and 1126.97±1.0 kJ·mol-1. The reaction orders and frequency factors can be also determined by Kissinger method. The kinetics equations of each reaction were deduced as dα/dt=1.736×1039e-90000/T((1 - α)1.057,dα/dt=1.806x 1039e-111500/T(1- α)0.844 and dα/dt=4.262 × 1042e-135000/T(1 -α )1.275.

关 键 词：LiNiO_(2) 热分解 动力学 活化能 

分 类 号：O614.111[理学—无机化学] TM911.14[理学—化学]