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采用高温固相法制备了Nb掺杂Li1.16Mn0.56Ni0.28O2正极材料。研究发现Nb掺杂能够增大一次颗粒尺寸，降低比表面积。当掺杂量≤0.1%(质量分数)时，a、c值线性增长并遵循Vegard定律，表明Nb进入富锂锰基材料晶体结构中过渡金属位；掺杂量>0.1%时，部分Nb以化合物的形式存在于晶界或表面。0.1%掺杂量样品电化学性能最佳：0.1 C放电比容量和库伦效率分别为256.9 mAh/g和87.8%,0.5 C循环80周后容量保持率为85.4%。进入晶格后的Nb5+扩大了Li层间距有利于Li+的脱嵌，同时形成更强的Nb—O键，抑制晶格氧的流失，稳定材料的结构。
Abstract：Nb doped Li1.16Mn0.56Ni0.28O2 samples were prepared by high-temperature solid-state method.It is found that Nb doping can increase primary particles size and reduce specific surface area.The linear change of a and c values follows Vegard′s law when the doping amounts is less than 0.1%(mass fraction),indicating that Nb enters into the transition metal site; while Nb partly exists on grain boundary or surface in the form of Nb compound, when Nb-doping amount is more than 0.1%.The sample with 0.1% Nb doping shows the best electrochemical performance with specific discharge capacity of 256.9 mAh/g(0.1 C discharge capacity)and coulombic efficiency of 87.8%,it′s capacity retention is 85.4% after 80 cycles at 0.5 C.Nb doping expands the Li slab, which is helpful to the Li~+de-intercalation.Meanwhile the strong Nb—O bond alleviates the loss of lattice oxygen and stabilizes the structure of Co-free lithium rich manganese layered oxide.
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基本信息:
中图分类号:TQ131.11;TM912
引用信息:
[1]崔正元,王俊,刘亚飞,等.Nb掺杂对Li_(1.16)Mn_(0.56)Ni_(0.28)O_2性能的影响[J].有色金属(冶炼部分),2022(10):87-92.
基金信息:
国家重点研发计划项目(2020YFE0202800); 中信CBMM铌科学与技术研发合作项目(2020-M118)
2022-09-30
2022-09-30