【摘要】 将通过共沉淀法制备的M(OH)2(M=Mn,Ni)前驱体与Zn O和Li2CO3混合,合成了不同Zn2+掺杂量的Li1.13Ni0.3-xMn0.57ZnxO2材料.X射线衍射结果表明,Zn2+掺杂提升了材料的层状属性,降低了Li+/Ni2+混排程度.在2.0~4.8 V电压范围内,Zn2+掺杂材料表现出更高的可逆比容量,并具有良好的倍率性能和循环稳定性.示差扫描量热测试结果显示,Zn2+掺杂材料的热安全性能明显优于未掺杂材料.在所合成的材料中,Li1.13Ni0.29Mn0.57Zn0.01O2(Zn2+掺杂量x=0.01)具有最高的放电容量、最好的倍率性能和循环稳定性及极佳的热安全性能.更多还原

【Abstract】 Zn-doped Li1. 13Ni0. 3-xMn0. 57ZnxO2 samples were synthesized by co-precipitation method. X-ray diffraction shows that Zn doping decreases the Li+/ Ni2+cation mixing of the material,increases the structure stability and expands the lattice volume of the material which provides more space for lithium ion intercalation /de-intercalation. Electrochemical experiments show that Zn doping decreases the charge transfer resistance of the electrode,improves the reversibility of lithium intercalation and de-intercalation,thus the electrochemical properties of the material are improved. Especially,the Li1. 13Ni0. 29Mn0. 57Zn0. 01O2 material with Zn doping of x = 0. 01 shows the best electrochemical performance with the largest discharge capacity,best rate capability,excellent capacity retention and thermal stability.更多还原