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采用热重-差示扫描量热技术研究了高温固相法合成Li2MnSiO4正极材料的反应过程.结果表明:Li2MnSiO4前驱体在加热升温过程中的两个失重区主要归因于原料的脱水和分解;在不同升温速率条件下测得的差示扫描量热曲线主要由5个吸热峰组成;利用Doyle-Ozawa法和Kissinger法对前驱体分解失重阶段中三个吸热峰(>200℃)的反应活化能计算结果分别为:384.12、120.63、263.43 kJ/mol和350.78、117.16、227.59 kJ/mol;基于Kissinger法进一步确定了相关反应阶段的反应级数、频率因子和动力学速率方程.XRD测试说明:基于热力学结果的分步优化工艺能够减少终产物的杂质,改善合成质量.

参考文献

[1] 吕东平,王琳,杨勇.锂离子电池正硅酸盐正极材料研究进展[J].电化学,2011(02):161-168.
[2] 张新龙,胡国荣,童汇,彭忠东.正极材料锂铁(锰)硅氧化物的研究进展[J].电源技术,2008(02):128-131.
[3] 刘文刚,许云华,周志斌,杨蓉.合成条件对Li2MnSiO4正极材料性能的影响[J].电源技术,2010(04):360-362.
[4] Karthikeyan K;Aravindan V;Lee S B et al.Electrochemical pedormance of carbon-coated lithium manganese silicate for asymmetric hybrid supercapacitors[J].Journal of Power Sources,2010,195:3761-3764.
[5] Wengang Liu;Yunhua Xu;Rong Yang .Synthesis, characterization and electrochemical performance of Li_2MnSiO_4/cathode material by solid-state reaction[J].Journal of Alloys and Compounds,2009(2):L1-L4.
[6] 杨勇,方海升,李莉萍,闫国丰,李广社.Li2MnSiO4/C复合正极材料的合成及电化学性能[J].稀有金属材料与工程,2008(06):1085-1088.
[7] Deng C;Zhang S;Fu B L et al.Characterization of Li2MnSiO4 and Li2 FeSiO4 cathode materials synthesized via a citric acid assisted sol-gel method[J].Materials Chemistry and Physics,2010,120:14-17.
[8] 赵胜利,陈海云,李董轩,裴士轻,李洛利.尖晶石LiMn2O4薄膜的溶胶-凝胶制备[J].材料热处理学报,2007(z1):335-338.
[9] Dominko R;Bele M;Gaberscek M;Meden A;Remskar M;Jamnik J .Structure and electrochemical performance of Li2MnSiO4 and Li2FeSiO4 as potential Li-battery cathode materials[J].Electrochemistry communications,2006(2):217-222.
[10] R. Dominko;M. Bele;A. Kokalj;M. Gaberscek;J. Jamnik .Li_2MnSiO_4 as a potential Li-battery cathode material[J].Journal of Power Sources,2007(2):457-461.
[11] Gong, ZL;Li, YX;He, GN;Li, J;Yang, Y .Nanostructured Li2FeSiO4 electrode material synthesized through hydrothermal-assisted sol-gel process[J].Electrochemical and solid-state letters,2008(5):A60-A63.
[12] 程琥,刘子庚,李益孝,陈忠,杨勇.锂离子电池正极材料Li2MnSiO4固体核磁共振谱研究[J].电化学,2010(03):296-299.
[13] Zhong Dong Peng,Yan Bing Cao,Guo Rong Hu,Ke Du,Xu Guang Gao,Zheng Wei Xiao.Microwave synthesis of Li2FeSiO4 cathode materials for lithium-ion batteries[J].中国化学快报(英文版),2009(08):1000-1004.
[14] LIU Wengang,XU Yunhua,YANG Rong.Synthesis and electrochemical properties of Li2MnSiO4/C nanoparticles via polyol process[J].稀有金属(英文版),2010(05):511-514.
[15] Ozawa T .A new method of analyzing thermogravimetric data[J].Bulletin of the Chemical Society of Japan,1965,38(11):1881-1886.
[16] Kissinger H F .Reaction kinetic indifferential thermalanalysis[J].Annal Chem,1957,29(11):1702-1706.
[17] 胡荣祖;史启祯.热分析动力学[M].北京:科学出版社,2001:110-111.
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