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
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.
参考文献
| [1] | 日本可充电池发展情况. 电池商讯，1998， 1 (6)： 18--19. [2] 钟俊辉. 电源技术，1997， 21 (4)： 175--176. [3] Broussely M, Perton F, Labat J. Journal of Power Sources, 1993, 43--44: 209--216. [4] 田彦文，翟秀静，高虹, 等(TIAN Yan-Wen, et al). 无机材料学报(Journal of Inorganic Materials)?， 1999， 14 (3)： 483--486. [5] Ozawa T. Bull. Chem. Soc. Jpn., 1965, 38: 1881--1886. [6] Doyle C D. J. Appl. Polymer Sci., 1961, 5: 285--292. [7] Kissinger H E. J. Res. Nat. Bur. Stand, 1965, 57: 217--219. [8] Kissinger H E. Anal. Chem., 1957, 29: 1702--1704. |
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