Lithium Titanate Cuboid Arrays Grown on Carbon Fiber Cloth for High‐Rate Flexible Lithium‐Ion Batteries. Issue 42 (28th August 2019)

• Record Type: Journal Article
• Authors: Wang, Chao; Wang, Xianfen; Lin, Chunfu; Zhao, Xiu Song
• Is Part Of: Small. Volume 15:Issue 42(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-08-28
• Subjects: flexible electrodes -- lithium titanate -- lithium‐ion battery -- rate capability; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.201902183
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: 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 (Li4 Ti5 O12, 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 LiNi0.5 Mn1.5 O4 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. Abstract : A composite electrode with lithium titanate cuboid arrays grown on carbon fiber cloth exhibits a remarkable high‐rate performance and ultralong cycling stability as a binder‐free electrode for flexible lithium‐ion batteries. The electrode also displays excellent flexibility and electrochemical performance. The unique cuboid array architecture of the composite electrode facilitates lithium ion transport and enhances electron conductivity.