深圳大学学报理工版

通过静电纺丝技术制备了具有一维管状结构的Li1.2Mn0.54Ni0.13Co0.13O2正极材料,研究了煅烧温度对电极材料表面形貌和电化学性能的影响.结果表明,煅烧温度为850 ℃时所制产物具有较好的离子扩散性能,在50 mAh·g-1的电流密度下首次放电比容量为249.5 mAh·g-1,50次循环后的容量保持率为87%,表现出较高的放电比容量和较好的循环稳定性.

One-dimensional tube-like structure of Li1.2Mn0.54Ni0.13Co0.13O2 cathode material was synthesized by electrospinning. The effects of calcination temperature on the morphology and electrochemical performance of the battery cathode material were studied. The results show that the sample synthesized at 850 ℃ possesses a relatively high discharge capacity and good cyclic stability, which delivers 249.5 mAh·g-1 at the first cycle and remains 87% retention after 50 cycles at the current density of 50 mAh·g-1, owing to a relatively high ionic diffusion capability.

引言
1 实验
2 结果与讨论
3 结语

图1 不同煅烧温度样品的晶体结构衍射图<br/>Fig.1 XRD pattern of the LMNCO samples synthesized at 800,850 and 900 ℃

图1 不同煅烧温度样品的晶体结构衍射图
Fig.1 XRD pattern of the LMNCO samples synthesized at 800,850 and 900 ℃

图2 不同处理条件所得LMNCO的SEM图<br/>Fig.2 SEM images of LMNCO under different heat treatments

图2 不同处理条件所得LMNCO的SEM图
Fig.2 SEM images of LMNCO under different heat treatments

图3 800-LMNCO与850-LMNCO的TEM图<br/>Fig.3 TEM images for 800-LMNCO and 850-LMNCO

图3 800-LMNCO与850-LMNCO的TEM图
Fig.3 TEM images for 800-LMNCO and 850-LMNCO

图4 管状850-LMNCO样品的XPS图谱<br/>Fig.4 XPS analysis of the tube-like 850-LMNCO sample

图4 管状850-LMNCO样品的XPS图谱
Fig.4 XPS analysis of the tube-like 850-LMNCO sample

图5 不同LMNCO不同样品的电化学性能测试图<br/>Fig.5 Electrochemical tests of the LMNCO samples

图5 不同LMNCO不同样品的电化学性能测试图
Fig.5 Electrochemical tests of the LMNCO samples

图6 LMNCO样品交流阻抗谱测试<br/>Fig.6 EIS spectra of the LMNCO samples

图6 LMNCO样品交流阻抗谱测试
Fig.6 EIS spectra of the LMNCO samples

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引言

1 实验

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3 结语

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引言

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2 结果与讨论

3 结 语

期刊信息

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3 结语