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Enhancing Cyclic Performance and Rate Capability of Li 4 Ti 5 O 12 for Lithium‐Ion Batteries through Thin Carbon Coating
Author(s) -
Huang Xingkang,
Ren Ren,
Singh Niraj K.,
Hardi Meenakshi,
Chen Junhong
Publication year - 2018
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201802308
Subject(s) - materials science , lithium titanate , lithium (medication) , acetylene , chemical vapor deposition , coating , chemical engineering , electrode , ion , carbon fibers , lithium ion battery , nanotechnology , composite material , composite number , battery (electricity) , organic chemistry , chemistry , medicine , power (physics) , physics , quantum mechanics , engineering , endocrinology
Lithium titanate (Li 4 Ti 5 O 12 , LTO), as a zero‐strain material upon lithiation, typically possesses good cyclic performance, presenting an opportunity for use in lithium‐ion batteries for electric vehicles. For practical applications, the electrical conductivity of the LTO should be improved while addressing its gassing issue. Here, a C‐coated LTO (LTO@C) electrode material was synthesized by chemical vapor deposition, and a coating of C approximately 2 nm‐thick was placed onto the LTO surface by decomposing acetylene at 700 °C for 15 min. Compared with the pristine LTO, the LTO@C did not exhibit significant changes in structure and morphology; however, it presented much better cyclic performance than the pristine LTO, i.e., the capacity retention improved from 41.3% to 77.6% within 500 cycles at room temperature and from 58.0% to 97.0% within 100 cycles at 55 °C.