| 纳米MgO掺杂改善LiNi1/3Co1/3Mn1/3O2正极材料 |
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| 引用本文： | 李节宾,徐友龙,熊礼龙,王景平.纳米MgO掺杂改善LiNi1/3Co1/3Mn1/3O2正极材料[J].物理化学学报,2011,27(11):2593-2599. |
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| 作者姓名： | 李节宾 徐友龙 熊礼龙 王景平 |
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| 作者单位： | 1. International Center for Dielectric Research, Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, P. R. China;
2. Shaanxi Applied Physics and Chemistry Research Institute, Xi'an 710061, P. R. China |
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| 摘 要： | 将氢氧化物共沉淀法制备的(Ni1/3Co1/3Mn1/3)（OH）2在500℃热处理5 h得到具有尖晶石结构、纳米尺寸的氧化物M3O4(M=Ni1/3Co1/3Mn1/3).将其与LiOH及不同量的纳米MgO混合均匀,并在850℃热处理24 h制备了Li(Ni1/3Co1/3Mn1/3)1/xMgxO2（x=0,0.01,0.02,0.03,0.04,0.05）正极村料.随着Mg掺杂量的增大,正极材料的晶胞参数增大;少量的Mg掺杂增大了锂离子的扩散系数,而过度掺杂却使锂离子扩散系数有所降低,其中Li(Ni1/3Co1/3Mn1/3)0.98Mg0.02O2的锂离子扩散系数最大,其脱出和嵌入扩散系数分别为DLi-dein=29.20×10-11cm2·S-1和DLi-in=4.760×10-11cm2·s-1;其以3C倍率充放电的平均放电比容量为139.3 mAh·g-1,比未掺杂的原粉约高9.5 mAh·g-1;另外其循环性能也得到了大幅度改善.
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| 关 键 词： | 锂离子电池 正极材料 LiNi1/3Co1/3Mn1/3O2 Mg掺杂 锂离子扩散系数 |
| 收稿时间： | 2011-06-07 |
| 修稿时间： | 2011-08-29 |
Improvement of LiNi1/3Co1/3Mn1/3O2 Cathode Materials by Nano-MgO Doping |
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| LI Jie-Bin,XU You-Long,XIONG Li-Long,WANG Jing-Ping.Improvement of LiNi1/3Co1/3Mn1/3O2 Cathode Materials by Nano-MgO Doping[J].Acta Physico-Chimica Sinica,2011,27(11):2593-2599. |
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| Authors: | LI Jie-Bin XU You-Long XIONG Li-Long WANG Jing-Ping |
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| Institution: | 1. International Center for Dielectric Research, Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, Xi'an Jiaotong University, Xi'an 710049, P. R. China;
2. Shaanxi Applied Physics and Chemistry Research Institute, Xi'an 710061, P. R. China |
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| Abstract: | Nano-sized M3O4(M=Ni1/3CO1/3Mn1/3) powder with a spinel structure was prepared by sintering co-precipitated M（OH）2 at 500℃for 5 h.The so-obtained M3O4 was then mixed with LiOH and different amounts of nano-MgO.The mixture was sintered at 850℃for 24 h to synthesize Li(Ni1/3Co1/3Mn1/3)1-xMgxO2 （x=0,0.01,0.02,0.03,0.04,0.05） cathode materials.The lattice parameters increased while the diffusion coefficients of Li+ ion showed an increasing and then decreasing trend with an increase in the amount of Mg substitution.Li(Ni1/3Co1/3Mn1/3)0.98Mg0.02O2 had the highest Li+ ion diffusion coefficients,which were 29.20×10-11 cm2·s-1 for Li+ de-intercalation and 4.760×10-11 cm2·s-1 for Li+ intercalation.Its discharge capacity at 3C rate was 139.3 mAh·g-1,which is 9.5 mAh·g-1 higher than that of the pristine material.Furthermore,its cycle performance was also improved significantly compared with the un-doped counterpart. |
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| Keywords: | Lithium ion battery Cathode material LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2 Mg-doping Diffusion coefficient of Li~ ion |
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