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Lithium Titanate Cuboid Arrays Grown on Carbon Fiber Cloth for High‐Rate Flexible Lithium‐Ion Batteries
Author(s) -
Wang Chao,
Wang Xianfen,
Lin Chunfu,
Zhao Xiu Song
Publication year - 2019
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201902183
Subject(s) - materials science , anode , electrode , lithium titanate , lithium (medication) , cathode , carbon fibers , nanotechnology , electrochemistry , composite number , spinel , fiber , chemical engineering , composite material , lithium ion battery , battery (electricity) , chemistry , metallurgy , medicine , power (physics) , physics , quantum mechanics , engineering , endocrinology
High‐rate performance flexible lithium‐ion batteries are desirable for the realization of wearable electronics. The flexibility of the electrode in the battery is a key requirement for this technology. In the present work, spinel lithium titanate (Li 4 Ti 5 O 12 , LTO) cuboid arrays are grown on flexible carbon fiber cloth (CFC) to fabricate a binder‐free composite electrode (LTO@CFC) for flexible lithium‐ion batteries. Experimental results show that the LTO@CFC electrode exhibits a remarkably high‐rate performance with a capacity of 105.8 mAh g −1 at 50C and an excellent electrochemical stability against cycling (only 2.2% capacity loss after 1000 cycles at 10C). A flexible full cell fabricated with the LTO@CFC as the anode and LiNi 0.5 Mn 1.5 O 4 coated on Al foil as the cathode displays a reversible capacity of 109.1 mAh g −1 at 10C, an excellent stability against cycling and a great mechanical stability against bending. The observed high‐rate performance of the LTO@CFC electrode is due to its unique corn‐like architecture with LTO cuboid arrays (corn kernels) grown on CFC (corn cob). This work presents a new approach to preparing LTO‐based composite electrodes with an architecture favorable for ion and electron transport for flexible energy storage devices.