Effect of electrolytic MnO₂ pretreatment on performance of as-prepared LiMn₂O₄

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• 作者：Yu-qian ZHAO^a ; ^{zhaocsu@hotmail.com} ; Qing-lai JIANG^b ; Wei-gang WANG^c ; Ke DU^c ; Guo-rong HU^c
• 关键词：lithium-ion batteries ; cathode material ; LiMn2O4 ; MnO2
• 刊名：Transactions of Nonferrous Metals Society of China
• 出版年：2012
• 期刊代码：12_10036326
• 类别：ms
• 出版时间：May, 2012
• 卷：22
• 期：5
• 页码：1146-1150
• 文件大小：293 K

摘要

To investigate the effect of electrolytic MnO₂ (EMD) on the performance of LiMn₂O₄, several pretreatment methods, such as acid treating, presintering and impregnating with chromic salt, were used. The pretreated EMD and prepared LiMn₂O₄ were characterized by X-ray diffraction and inductively coupled plasma emission spectrometry. Charge and discharge tests of Li/LiMn₂O₄ batteries were also employed to evaluate electrochemical performance. The experimental results show that inorganic impurity contents in EMD decrease remarkably after acid treating; presintering EMD can remove adsorbent water and organic impurity, enlarge pore space and increase active reaction sites; pre-doping chromium in EMD can form more homogenous compound substance LiCr_0.05Mn_1.95O₄, which shows better structural stability and capacity retention.