Ca-doped Li_4Ti_5O_(12) Nanosphere as a Superior Anode Material for Lithium-ion Batteries
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- 英文论文题名：Ca-doped Li_4Ti_5O_(12) Nanosphere as a Superior Anode Material for Lithium-ion Batteries
- 论文作者：Qianyu Zhang ; Chuying Ouyang ; Lingzhi Zhang
- 英文论文作者：Qianyu Zhang ; Chuying Ouyang ; Lingzhi Zhang ; Key Laboratory of Renewable Energy ; Guangzhou Institute of Energy Conversion ; Chinese Academy of Sciences ; Department of Physics ; Jiangxi Normal University
- 年：2016
- 作者机构：Key Laboratory of Renewable Energy,Guangzhou Institute of Energy Conversion,Chinese Academy of Sciences;Department of Physics,Jiangxi Normal University;
- 英文论文关键词：Lithium-ion batteries ; Li_4Ti_5O_(12) ; Doping ; Nanosphere ; Rate-performance
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第三十分会：化学电源
- 语种：英文
- 分类号：TQ131.11;TM912
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第三十分会 ; 化学电源
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：370k
- 原文格式：D
- 会议级别：全国
摘要
Li_4Ti_5O_(12)(LTO)has been considered as a promising anode material for lithium-ion batteries(LIBs).Unfortunately,the implementation of LTO is hampered by its low electronic conductivity and relatively poor lithium diffusion coefficient.Doping and nanostructuring are two important strategies to overcome such problems.In this work,we report a controllable route to synthesize Ca-doped LTO nanosphere to improve LTO's rate capability.Density functional theory calculations reveal that Ca~(2+)substituting on the Li site enables an electron to easily move to an energy level higher than the Fermi level,indicating that Ca-doped LTO is an electrical conductor.Moreover,detailed characterizations demonstrate that the spherical nanostructuring reduces the diffusion distance for both the Li ions and electrons within the LTO bulk.When tested as the anode in LIBs,it exhibits superior rate-performance with an ultrahigh specific capacity of 160.8 mAhg-1 at 10 C-rate after 200 cycles.Therefore,this strategy provides a new insight on how to significantly enhance LTO's rate performance for targeted applications via doping and nanostructuring.
Li_4Ti_5O_(12)(LTO) has been considered as a promising anode material for lithium-ion batteries(LIBs).Unfortunately,the implementation of LTO is hampered by its low electronic conductivity and relatively poor lithium diffusion coefficient.Doping and nanostructuring are two important strategies to overcome such problems.In this work,we report a controllable route to synthesize Ca-doped LTO nanosphere to improve LTO's rate capability.Density functional theory calculations reveal that Ca~(2+) substituting on the Li site enables an electron to easily move to an energy level higher than the Fermi level,indicating that Ca-doped LTO is an electrical conductor.Moreover,detailed characterizations demonstrate that the spherical nanostructuring reduces the diffusion distance for both the Li ions and electrons within the LTO bulk.When tested as the anode in LIBs,it exhibits superior rate-performance with an ultrahigh specific capacity of 160.8 mAh·g-1 at 10 C-rate after 200 cycles.Therefore,this strategy provides a new insight on how to significantly enhance LTO's rate performance for targeted applications via doping and nanostructuring.
Li_4Ti_5O_(12)(LTO) has been considered as a promising anode material for lithium-ion batteries(LIBs).Unfortunately,the implementation of LTO is hampered by its low electronic conductivity and relatively poor lithium diffusion coefficient.Doping and nanostructuring are two important strategies to overcome such problems.In this work,we report a controllable route to synthesize Ca-doped LTO nanosphere to improve LTO's rate capability.Density functional theory calculations reveal that Ca~(2+) substituting on the Li site enables an electron to easily move to an energy level higher than the Fermi level,indicating that Ca-doped LTO is an electrical conductor.Moreover,detailed characterizations demonstrate that the spherical nanostructuring reduces the diffusion distance for both the Li ions and electrons within the LTO bulk.When tested as the anode in LIBs,it exhibits superior rate-performance with an ultrahigh specific capacity of 160.8 mAh·g-1 at 10 C-rate after 200 cycles.Therefore,this strategy provides a new insight on how to significantly enhance LTO's rate performance for targeted applications via doping and nanostructuring.
引文