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Synthesis of Nanoporous Li 4 Ti 5 O 12 –TiO 2 Composites for High‐Performance Lithium‐Ion‐Battery Anodes
Author(s) -
Zhang Wei,
Liu Zhongyi,
Xiao Xingcheng,
Liu Dawei
Publication year - 2016
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201500299
Subject(s) - nanoporous , materials science , anode , calcination , lithium (medication) , electrochemistry , nitrogen , composite material , lithium ion battery , battery (electricity) , chemical engineering , nanotechnology , electrode , catalysis , chemistry , medicine , biochemistry , power (physics) , physics , organic chemistry , quantum mechanics , endocrinology , engineering
This work reports the synthesis of Li 4 Ti 5 O 12 –TiO 2 nanoporous composites through an effective, inexpensive, and easily scalable approach. The as‐synthesized products were calcined under a nitrogen atmosphere at 700, 750, or 800 °C. When used as anode materials for lithium‐ion batteries, the 750 °C nitrogen‐treated Li 4 Ti 5 O 12 –TiO 2 sample showed significantly improved capacity as well as good rate capability and cycling stability compared with other samples. It delivered capacities of 220 and 213 mAh g −1 at a current density of 30 mA g −1 when tested at room temperature and 55 °C, respectively. It still had capacities of 184 and 197 mAh g −1 after 50 cycles, which was noticeably higher than the known theoretical capacity of pure Li 4 Ti 5 O 12 (175 mAh g −1 ). The excellent electrochemical performance of the nitrogen‐treated nanoporous composites could be attributed to the improved morphology, dual phase crystal structure, and the presence of surface defects from nitrogen treatment.