Self-supported hierarchical porous Li_(4)Ti_(5)O_(12)/carbon arrays for boosted lithium ion storage  

作　　者：Jun Liu Aixiang Wei Guoxiang Pan Shenghui Shen Zhiming Xiao Yu Zhao Xinhui Xia 

机构地区：[1]Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter,School of Materials and Energy,Guangdong University of Technology,Guangzhou 510006,Guangdong,China [2]School of Information Science,Xinhua College of Sun Yat-sen University,Guangzhou 510520,Guangdong,China [3]Department of Materials Chemistry,Huzhou University,Huzhou 313000,Zhejiang,China [4]State Key Laboratory of Silicon Materials,Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province,and Department of Materials Science and Engineering,Zhejiang University,Hangzhou 310027,Zhejiang,China

出　　处：《Journal of Energy Chemistry》2021年第3期754-760,共7页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.51772272);Natural Science Funds for Distinguished Young Scholar of Zhejiang Province(Grant No.LR20E020001);Startup Foundation for Hundred-Talent Program of Zhejiang University;Pearl River S&T Nova Program of Guangzhou(Grant No.201710010143)。

摘　　要：The development of fast rechargeable lithium ion batteries(LIBs)is highly dependent on the innovation of advanced high-power electrode materials.In this work,for the first time,we report a sacrificial NiO arrays template method for controllable synthesis of self-supported hierarchical porous Li_(4)Ti_(5)O_(12)/C(LTO/C)nanoflakes arrays,for use as fast rechargeable anodes for LIBs.The ultrathin(2-3 nm)carbon layer was uniformly coated on the LTO forming arrays architecture.The hierarchical porous LTO/C nanoflakes consisted of primary cross-linked nanoparticles of 50-100 nm and showed large porosity.Because of the enhanced electrical conductivity and accelerated ion transfer channels,the well-designed binderfree porous LTO/C nanoflakes arrays exhibited notable high-rate lithium ion storage performance with smaller polarization,better electrochemical reactivity,higher specific capacity(157 mAh g^(-1) at the current density of 20C)and improved long-term cycling life(96.2% after 6000 cycles at 20C),superior to the unmodified porous LTO arrays counterpart(126 mAh g^(-1) at 20C and 88.0%after 6000 cycles at 20C).Our work provides a new template for the construction of high-performance high-rate electrodes for electrochemical energy storage.

关 键 词：Lithium titanate CARBON ANODE High rate Lithium ion batteries 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ131.11[化学工程—无机化工]