过渡金属对锂离子电池正极材料Li[NixCoyMnz]O2 (0.6≤x≤ 0.8)结构和电化学性能的影响

来源期刊:中国有色金属学报(英文版)2016年第5期

论文作者:潘成迟 朱裔荣 杨应昌 侯红帅 景明俊 宋维鑫 杨旭明 纪效波

文章页码:1396 - 1402

关键词:Li[NixCoyMnz]O2;电化学性能;正极材料;锂离子电池

Key words:Li[NixCoyMnz]O2; electrochemical performance; cathode material; lithium-ion battery

摘    要:利用共沉淀法制备具有典型六边形α-NaFeO2结构的正极材料Li[NixCoyMnz]O2 (0.6≤x≤0.8)。XRD结果表明:(003)峰与(104)峰的强度比随镍含量的减少而增加,随钴含量的增加而增加。SEM结果表明:材料是由微小的初级颗粒聚集而成的二次颗粒,并且随锰含量的增加,初级颗粒和二次颗粒变大,同时Li[Ni0.6Co0.2Mn0.2]O2颗粒分布比较均匀,颗粒大小为100~300 nm。尽管锂离子电池Li/Li[NixCoyMnz]O2的首次放电容量随镍含量的减少而减小,但是循环和倍率性能却随锰或钴含量的增加而得到改善。Li[Ni0.6Co0.2Mn0.2]O2 具有良好的循环性能,在循环50次后还能保持97.1%的容量保持率。

Abstract: Li[NixCoyMnz]O2 (0.6≤x≤0.8) cathode materials with a typical hexagonal α-NaFeO2 structure were prepared utilizing a co-precipitation method. It is found that the ratio of peak intensities of (003) to (104) observed from X-ray diffraction (XRD) increases with decreasing the Ni content or increasing the Co content. The scanning electron microscopy (SEM) images reveal that the small primary particles are agglomerated to form the secondary ones. As the Mn content increases, the primary and secondary particles become larger and the resulted particle size for the Li[Ni0.6Co0.2Mn0.2]O2 is uniformly distributed in the range of 100-300 nm. Although the initial discharge capacity of the Li/Li[NixCoyMnz]O2 cells reduces with decreasing the Ni content, the cyclic performance and rate capability are improved with higher Mn or Co content. The Li[Ni0.6Co0.2Mn0.2]O2 can deliver excellent cyclability with a capacity retention of 97.1% after 50 cycles.

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