| 高振实密度球形LiNi_(0.5)Co_(0.3)Mn_(0.2)O_2粉末的合成及性能 |
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| 引用本文： | 杨志,李新海,王志兴,彭文杰,郭华军.高振实密度球形LiNi_(0.5)Co_(0.3)Mn_(0.2)O_2粉末的合成及性能[J].中国有色金属学报,2010,20(1). |
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| 作者姓名： | 杨志 李新海 王志兴 彭文杰 郭华军 |
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| 作者单位： | 中南大学,冶金科学与工程学院,长沙,410083 |
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| 基金项目： | 国家重点基础研究计划资助项目，湖南省科技计划资助项目 |
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| 摘 要： | 以共沉淀法制备的球形Ni_(0.5)Co_(0.3)Mn_(0.2)CO_3粉末为前驱体,按一定的比例将碳酸锂与前驱体混合,然后采用高温固相法合成高振实密度球形LiNi_(0.5)Co_(0.3)Mn_(0.2)O_2正极材料.该材料的振实密度达到2.60 g/cm~3,与商品化LiCoO_2的密度相当.SEM分析表明, LiNi_(0.5)Co_(0.3)Mn_(0.2)O_2正极材料与前驱体形貌有良好的继承性,均为理想的球形.XRD物相分析表明,在不同合成温度下的Li Ni_(0.5)Co_(0.3) Mn_(0.2)O_2产物均为具有α-NaFeO_2层状结构的纯相物质,在较高合成温度下所得材料的结晶度较高.电化学性能研究表明,在2.7～4.3 V的电压范围内,电池的放电比容量在0.2C倍率下为168.1 mA-h/g,在1C倍率下为157.6 mA-h/g;经50次循环后,两种放电条件下的电池容量保持率分别为95.1%和97.2%,显示出良好的电化学性能.
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| 关 键 词： | 锂离子电池 正极材料 振实密度 |
Synthesis and characterization of high tap-density spherical LiNi_(0.5)Co_(0.3)Mn_(0.2)O_2 powders |
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| YANG Zhi,LI Xin-hai,WANG Zhi-xing,PENG Wen-jie,GUO Hua-jun.Synthesis and characterization of high tap-density spherical LiNi_(0.5)Co_(0.3)Mn_(0.2)O_2 powders[J].The Chinese Journal of Nonferrous Metals,2010,20(1). |
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| Authors: | YANG Zhi LI Xin-hai WANG Zhi-xing PENG Wen-jie GUO Hua-jun |
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| Affiliation: | YANG Zhi,LI Xin-hai,WANG Zhi-xing,PENG Wen-jie,GUO Hua-jun (School of Metallurgical Science , Engineering Central South University,Changsha 410083,China) |
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| Abstract: | The high tap-density spherical LiNi0.5Co0.3Mn0.2O2 cathode materials were synthesized from coprecipitated Ni0.5Co0.3Mn0.2CO3 by high-temperature solid-state method.The tap-density of the material is as high as 2.60 g/cm3,which is similar to commercial LiCoO2.The SEM results reveal that the LiNi0.5Co0.3Mn0.2O2 cathode material has well kept the spherical morphology of the spherical precursor.The XRD results show that all the LiNi0.5Co0.3Mn0.2O2 samples have high purity phase,and the powders are much better c... |
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| Keywords: | Li Ni_(0 5)Co_(0 3)Mn_(0 2)O_2 Li-ion battery cathode material tap-density Li Ni_(0 5)Co_(0 3)Mn_(0 2)O_2 |
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