纳米M 掺杂改善LiNi1/3Co1/3Mn1/3O2正极材料

引用本文: 李节宾, 徐友龙, 熊礼龙, 王景平. 纳米M 掺杂改善LiNi_1/3Co_1/3Mn_1/3O₂正极材料[J]. 物理化学学报, 2011, 27(11): 2593-2599. doi: 10.3866/PKU.WHXB20111104 shu

Citation: LI Jie-Bin, XU You-Long, XIONG Li-Long, WANG Jing-Ping. Improvement of LiNi_1/3Co_1/3Mn_1/3O₂ Cathode Materials by Nano-M Doping[J]. Acta Physico-Chimica Sinica, 2011, 27(11): 2593-2599. doi: 10.3866/PKU.WHXB20111104 shu

纳米M 掺杂改善LiNi_1/3Co_1/3Mn_1/3O₂正极材料

摘要: 将氢氧化物共沉淀法制备的(Ni_1/3Co_1/3Mn_1/3)(OH)₂在500°C热处理5 h 得到具有尖晶石结构、纳米尺寸的氧化物M₃O₄ (M=Ni_1/3Co_1/3Mn_1/3). 将其与LiOH及不同量的纳米M 混合均匀, 并在850°C热处理24 h制备了Li(Ni_1/3Co_1/3Mn_1/3)_1-xMg_xO₂ (x=0, 0.01, 0.02, 0.03, 0.04, 0.05)正极材料. 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(Ni_1/3Co_1/3Mn_1/3)_0.98Mg_0.02O₂的锂离子扩散系数最大, 其脱出和嵌入扩散系数分别为D_Li-dein=29.20×10^-11 cm²·s^-1和D_Li-in=4.760×10^-11 cm²·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.

关键词:

English

Improvement of LiNi_1/3Co_1/3Mn_1/3O₂ Cathode Materials by Nano-M Doping

1.
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
Received Date: 07 June 2011
Available Online: 27 October 2011

Abstract: Nano-sized M₃O₄ (M=Ni_1/3Co_1/3Mn_1/3) powder with a spinel structure was prepared by sintering co-precipitated M(OH)₂ at 500°C for 5 h. The so-obtained M₃O₄ was then mixed with LiOH and different amounts of nano-M . The mixture was sintered at 850°C for 24 h to synthesize Li(Ni_1/3Co_1/3Mn_1/3)_1-xMg_xO₂ (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(Ni_1/3Co_1/3Mn_1/3)_0.98Mg_0.02O₂ 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.

Key words:

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

纳米M 掺杂改善LiNi_1/3Co_1/3Mn_1/3O₂正极材料

English

Improvement of LiNi_1/3Co_1/3Mn_1/3O₂ Cathode Materials by Nano-M Doping

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