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无机材料学报

无机材料学报

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LiNiO2热分解反应动力学研究

田彦文; 高虹; 翟玉春; 张新   

  1. 东北大学材料与冶金学院, 沈阳 110006
  • 收稿日期:1999-12-21 修回日期:2000-02-28 出版日期:2000-12-20 网络出版日期:2000-12-20

Dynamic Study on the Decomposition of LiNiO2

TIAN Yan-Wen; GAO Hong; ZHAI Yu-Chun; ZHANG Xin   

  1. School of material & metallurgy; Northeastern University; Shenyang; 110006 China
  • Received:1999-12-21 Revised:2000-02-28 Published:2000-12-20 Online:2000-12-20

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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－α）１．０５７； ｄα／ｄｔ＝１８０６×１０３９ｅ－１１１５００／Ｔ（１－α）０．８４４；ｄα／ｄｔ＝４．２６２×１０４２ｅ－１３５０００／Ｔ（１－α）１．２７５

关键词: LiNiO2, 热分解, 动力学, 活化能

Abstract: 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＝１．７３６ｘ１０３９ｅ－９００００／Ｔ（１－α）１．０５７； ｄα／ｄｔ＝１８０６×１０３９ｅ－１１１５００／Ｔ（１－α）０．８４４；ｄα／ｄｔ＝４．２６２×１０４２ｅ－１３５０００／Ｔ（１－α）１．２７５.

Key words: LiNiO2, decomposition, kinetics, activation energ

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