High Lithium Insertion Voltage Single‐Crystal H2Ti12O25 Nanorods as a High‐Capacity and High‐Rate Lithium‐Ion Battery Anode Material. Issue 1 (12th December 2017)

• Record Type: Journal Article
• Authors: Guo, Qiang; Chen, Li; Shan, Zizhao; Lee, Wee Siang Vincent; Xiao, Wen; Liu, Zhifang; Liang, Jingjing; Yang, Gaoli; Xue, Junmin
• Is Part Of: ChemSusChem. Volume 11:Issue 1(2018)
• Page Start: 299
• Page End: 310
• Publication Date: 2017-12-12
• Subjects: charge transfer -- electrochemistry -- high capacity -- lithium-ion batteries -- nanostructures; Green chemistry -- Periodicals; Sustainable engineering -- Periodicals; Chemistry -- Periodicals; Chemical engineering -- Periodicals; 660
• DOI: 10.1002/cssc.201701479
• Languages: English
• ISSNs: 1864-5631

Abstract

Abstract: H2 Ti12 O25 holds great promise as a high‐voltage anode material for advanced lithium‐ion battery applications. To enhance its electrochemical performance, control of the crystal orientation and morphology is an effective way to cope with slow Li + ‐ion diffusion inside H2 Ti12 O25 with severe anisotropy. In this report, Na2 Ti6 O13 nanorods, prepared from Na2 CO3 and anatase TiO2 in molten NaCl medium, were used as a precursor in the synthesis of long single‐crystal H2 Ti12 O25 nanorods with reactive facets. The as‐prepared H2 Ti12 O25 nanorods with a diameter of 100–200 nm showed higher charge (extraction) specific capacity and better rate performance than previously reported systems. The reversible capacity of H2 Ti12 O25 was 219.8 mAh g −1 at 1C after 100 cycles, 172.1 mAh g −1 at 10C, and 144.4 mAh g −1 at 20C after 200 cycles; these values are higher than those of H2 Ti12 O25 prepared by the conventional soft‐chemical method. Moreover, the as‐prepared H2 Ti12 O25 nanorods exhibited superior cycle stability with more than 94 % retention of capacity with nearly 100 % coulombic efficiency after 100 cycles at 1C. On the basis of the above results, long single‐crystal H2 Ti12 O25 nanorods synthesized in molten NaCl with outstanding electrochemical characteristics hold a significant amount of promise for hybrid electric vehicles and energy‐storage systems. Abstract : At face value : High‐capacity single‐crystal H2 Ti12 O25 nanorods (m‐H2 Ti12 O25 ) with exposed (0 1 0) facets can be synthesized by the molten‐salt method. The superior rate‐capacity performance and long cyclic stability of as‐prepared m‐H2 Ti12 O25 can be ascribed to its high crystallinity, exposed (0 1 0) facets with a low Li + migration energy barrier, and short diffusion pathway in the [0 1 0] direction.