| 不同锂过量和镍过量对5V正极材料LiNi_(0.5)Mn_(1.5)O_4性能的影响 |
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| 引用本文： | 张真,王超,张峥,向小春,刘兴泉.不同锂过量和镍过量对5V正极材料LiNi_(0.5)Mn_(1.5)O_4性能的影响[J].电子元件与材料,2011,30(9):31-35. |
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| 作者姓名： | 张真 王超 张峥 向小春 刘兴泉 |
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| 作者单位： | 电子科技大学微电子与固体电子学院电子薄膜与集成器件国家重点实验室,四川成都,610054 |
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| 基金项目： | 国家自然科学基金资助项目(No.21071026); 电子科技大学杰出人才引进资助项目(Y02002010201026); 河南省新乡市群力电源材料有限公司与新乡市天力能源材料有限公司资助项目(No.H04010301W0309113) |
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| 摘 要： | 采用柠檬酸络合自蔓延燃烧方法制备了5 V正极材料LiNi0.5Mn1.5O4。分别考察了不同锂过量和镍过量对LiNi0.5Mn1.5O4材料结构、形貌和电化学性能的影响。结果表明:当焙烧温度为820℃,焙烧时间为12 h,退火温度为600℃,退火时间为24 h时,制备LiNi0.5Mn1.5O4的最佳锂过量为9%(摩尔分数,下同),最佳镍过量为7%,在此条件下所制样品的首次放电比容量达到122.7 mA·hg-1,20次循环后的放电比容量保持率为98.5%,且只存在单一的4.7 V平台。
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| 关 键 词： | 锂离子电池 5V正极材料 LiNi0.5Mn1.5O4 柠檬酸络合物 自蔓延燃烧合成反应 |
Effects of excess lithium and excess nickel on the performance of 5 V cathode material LiNi_(0.5)Mn_(1.5)O_4 |
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| ZHANG Zhen,WANG Chao,ZHANG Zheng,XIANG Xiaochun,LIU Xingquan.Effects of excess lithium and excess nickel on the performance of 5 V cathode material LiNi_(0.5)Mn_(1.5)O_4[J].Electronic Components & Materials,2011,30(9):31-35. |
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| Authors: | ZHANG Zhen WANG Chao ZHANG Zheng XIANG Xiaochun LIU Xingquan |
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| Affiliation: | ZHANG Zhen,WANG Chao,ZHANG Zheng,XIANG Xiaochun,LIU Xingquan(State Key Laboratory of Electronic Thin Film and Integrated Devices,School of Microelectronics and Solid State Electronics,University of Electronic Science and Technology of China,Chengdu 610054,China) |
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| Abstract: | 5 V cathode material LiNi0.5Mn1.5O4 was synthesized by the self-propagating combustion method with citric acid as the complexing agent.The effects of excess lithium and excess nickel on the structure,morphology and electrochemical properties of LiNi0.5Mn1.5O4 were investigated.The results show that: the optimum excess amounts of lithium and nickel for LiNi0.5Mn1.5O4 preparation are 9% and 7%(in mole ratio),respectively,when the calcination temperature is 820 ℃,the calcination time is 12 h,the annealing temperature is 600 ℃ and the annealing time is 24 h.For the LiNi0.5Mn1.5O4 synthesized under the above optimal conditions,its initial discharge capacity reaches 122.7 mAh·g–1,98.5% of which is still remained after 20 cycles,and there is only one voltage plateau at around 4.7 V found in its initial charge/discharge curve. |
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| Keywords: | lithium ion battery 5 V cathode material LiNi0 5Mn1 5O4 citric acid complex self-propagating combustion synthesis |
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