Controlled Ag-driven superior rate-capability of Li4Ti5O12 anodes for lithium rechargeable batteries  

作　　者：Jae-Geun Kim Dongqi Shi Min-Sik Park Goojin Jeong Yoon-Uk Heo Minsu Seo Young-Jun Kim Jung Ho Kim Shi Xue Dou 

机构地区：[1]Institute for Superconducting and Electronic Materials, University of Wollongong, North Wollongong, NSW2500, Australia [2]Advanced Batteries Research Center, Korea Electronics Technology Institute, Seongnam 463-816, Republic of Korea [3]Research Facility Center, Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea

出　　处：《Nano Research》2013年第5期365-372,共8页纳米研究（英文版）

摘　　要：The morphology and electronic structure of a Li4Ti5012 anode are known to determine its electrical and electrochemical properties in lithium rechargeable batteries. Ag-Li4Ti5012 nanofibers have been rationally designed and synthesized by an electrospinning technique to meet the requirements of one-dimensional （1D） morphology and superior electrical conductivity. Herein, we have found that the 1D Ag-Li4Ti5012 nanofibers show enhanced specific capacity, rate capability, and cycling stability compared to bare Li4Ti5012 nanofibers, due to the Ag nanoparticles （〈5 nm）, which are mainly distributed at interfaces between Li4Ti5O12 primary particles. This structural morphology gives rise to 20% higher rate capability than bare Li4Ti5O12 nanofibers by facilitating the charge transfer kinetics. Our findings provide an effective way to improve the electrochemical performance of Li4Ti5O12 anodes for lithium rechargeable batteries.形态学和 Li4Ti5O12 阳极的电子结构被知道在锂决定它的电、电气化学的性质可充电的电池。Ag-Li4Ti5O12 nanofibers 讲道理地被设计了并且由一种 electrospinning 技术综合了满足要求一个维(1D ) 形态学和优异电的电导率。此处，我们发现了 1D Ag-Li4Ti5O12 nanofibers 表演与赤裸的 Li4Ti5O12 nanofibers 相比提高了特定的能力，率能力，和骑车的稳定性，由于 Ag nanoparticles (< 5 nm ) ，它主要在在 Li4Ti5O12 主要粒子之间的接口被散布。这结构的形态学由便于费用转移动力学比赤裸的 Li4Ti5O12 nanofibers 产生 20% 更高的率能力。我们的调查结果提供一个有效方法为锂改进 Li4Ti5O12 阳极的电气化学的表演可充电的电池。

关 键 词：spinel Li4Ti5012 （LTO） ELECTROSPINNING silver doping lithium rechargeablebatteries 1D nanostructure 

分 类 号：O614.122[理学—无机化学] TM911[理学—化学]