杨绪岭,刘永.铝掺杂对无钴正极LiNi0.90Mn0.10O2结构及电化学性能的影响[J].南华大学学报(自然科学版),2022,(3):89~97.[YANG Xuling,LIU Yong.Effect of Aluminum Doping on the Structure and Electrochemical Properties of Cobalt Free Cathode LiNi0.90Mn0.10O2[J].Journal of University of South China(Science and Technology),2022,(3):89~97.]
铝掺杂对无钴正极LiNi0.90Mn0.10O2结构及电化学性能的影响
Effect of Aluminum Doping on the Structure and Electrochemical Properties of Cobalt Free Cathode LiNi0.90Mn0.10O2
投稿时间:2021-12-25  
DOI:
中文关键词:  锂离子电池  无钴  铝掺杂  正极
英文关键词:lithium-ion battery  cobalt-free  Al doping  cathode
基金项目:国家自然科学基金资助项目(11875164);国防科工局核设施退役及放射性废物处理项目(JSZL2019403C001);湖南省重点领域研发计划资助项目(2019SK2011)
作者单位E-mail
杨绪岭 南华大学 资源环境与安全工程学院,湖南 衡阳 421001 1198227727@qq.com 
刘永 南华大学 资源环境与安全工程学院,湖南 衡阳 421001  
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中文摘要:
      采用共沉淀法将质量分数3%的Al取代Mn掺入二元Ni0.90Mn0.10OH2前驱体中,经高温固相烧结合成一种无Co高Ni三元正极LiNi0.90Mn0.07Al0.03O2,并通过X射线衍射(X ray diffraction,XRD)、扫描电子显微镜(scanning electron microscope,SEM)、能量弥散射线谱(energy dispersive spectroscopy,EDS)等表征手段进行分析,探讨了Al3+掺杂对材料结构及性能的影响。结果表明,引入Al3+后,Ni0.90Mn0.07Al0.03OH2一次颗粒明显变细,对应LiNi0.90Mn0.07Al0.03O2结晶度明显提高。在25 ℃、3.0~4.3 V下充放电,掺杂材料的0.1C比容量为191.3 mAh/g,高于未掺杂材料的181.5 mAh/g;0.5C循环90次的容量保持率为92.0%,高于未掺杂材料的89.3%;高温45 ℃下循环容量保持率为90.7%,高于未掺杂材料的92.2%。材料性能的提升可归因于Al3+掺杂使得材料结晶度升高,稳定性提升,Li+传递势垒降低。
英文摘要:
      In this paper, the co-precipitation method was used to insert 3% Al substituted Mn into binary Ni0.90Mn0.10OH2 precursor, and a kind of high Ni ternary cathode LiNi0.90Mn0.07Al0.03O2 without Co was synthesized by high temperature solid-phase sintering, and analyzed by X Ray Diffraction (XRD), Scanning Electron Microscope (SEM), Energy Dispersive Spectroscopy (EDS) and other characterization methods. The influence of Al3+ doping on the structure and properties of the materials was discussed. The results showed that the Ni0.90Mn0.07Al0.03OH2 particles became fine obviously after the introduction of Al3+, and the corresponding crystallinity of LiNi0.90Mn0.07Al0.03O2 was increased obviously. The specific capacity of 0.1C doped material is 191.3 mAh/g at 25 ℃ and 3.0~4.3 V, which is higher than that of undoped material 181.5 mAh/g. The retention rate of 90 cycles at 0.5C is 92.0%, which is higher than that of the undoped materials (89.3%). The retention rate of cyclic capacity at 45 ℃ is 90.7%, which is higher than that of undoped material 92.2%. The improvement of material performance can be attributed to the increase of crystallinity and stability of the material caused by Al3+ doping, and the decrease of Li+ transfer barrier.
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