【作者】 王国卿； 谢健； 曹高劭； 朱铁军； 赵新兵；

【Author】 Guoqing Wang,Jian Xie,Gaoshao Cao,Tiejun Zhu,Xinbing Zhao (Department of Materials Science and Engineering,Zhejiang University,Hangzhou,310027)

【机构】 浙江大学材料科学与工程学系；

【摘要】 以?-MnO₂纳米管作为自模板,合成了LiNi_0.5Mn_1.5O₄单晶纳米管,其管径约200nm,壁厚约200nm,长度1-4?m。结果表明,LiNi_0.5Mn_1.5O₄单晶纳米管表现出优异的高倍率性能、循环性能和良好的结构稳定性。10C的倍率下,该材料能够表现出80 mAh g^-1的放电容量,在1C循环倍率下,200次循环后,该材料表现出75%的容量保持率。一维LiNi_0.5Mn_1.5O₄单晶纳米管,在径向表现出纳米结构单元（约200nm）,在轴向表现出微米级（1-4 mm）,因此,这种材料不仅能够保证快速的锂离子扩散,而且保证了较高的整体结构稳定性。而且,一维管状的单晶结构也有利于改善其倍率性能。更多还原

【Abstract】 Single-crystalline nanotubes of LiNi_0.5Mn_1.5O₄ with a diameter of about 600 nm,a wall thickness of about 200 nm and a length of 1-4μm have been synthesized via a template-engaged reaction using ? -MnO₂ nanotubes as a self-sacrifice template.The results show that single-crystalline nanotubes of LiNi_0.5Mn_1.5O₄ deliver superior rate capability,cycling performance and structural stability after cycling.About 80 mAh g^-1 of discharge capacity at 10 C rate and 75%of capacity retention after 200 cycles at 1C rate were obtained.Single-crystalline nanotube of LiNi_0.5Mn_1.5O₄ has been considered as a kind of micro-/nano-structure because it not only holds a nanometer-sized building block with about 200 nm in radial direction and a micrometer-sized assembly with 1-4 ? m in axial direction.Therefore,the micro-/nano-structured LiNi_0.5Mn_1.5O₄ can supply fast Li⁺ ion diffusion and guarantee the structural integrity.In addition,one dimensional tubular single-crystalline structure is also beneficial to improve the high-rate capabilities.更多还原